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1.
Exudate components exert different influences on microbially mediated C losses in simulated rhizosphere soils of a spruce plantation 总被引:1,自引:0,他引:1
Yuanshuang Yuan Wenqiang Zhao Juan Xiao Ziliang Zhang Mingfeng Qiao Qing Liu Huajun Yin 《Plant and Soil》2017,413(1-2):127-144
Aims
An emerging shoot experiences mechanical impedance (MI) prior to initiating photosynthesis, when it needs to break through soil that has a surface crust. This is the one of the first physical stresses that the shoot experiences. Surprisingly, few measurements have been made to understand the impact of this stress upon post-emergent shoot growth.Methods
A system employed wax layers of different strengths to investigate shoot responses to MI of the soil surface. Experiments tested the responses of plants to MI using wax layers with different strengths, and tested different seed sizes, nitrogen and phosphorus nutrition and different wheat genotypes. Detailed leaf and root morphological responses and photosynthetic gas exchange and fluorescence were measured.Results
MI produced permanent impairment to limit plant size, leaf growth rate and leaf photosynthetic function. Large seed sizes and N and P fertilization were able to overcome MI, especially for moderate levels of impedance. There was strong genotypic variation in the response to MI among 14 diverse wheat cultivars, and breeding for varieties suitable to no-tillage cropping systems appears to have facilitated selection in the ability to overcome MI of the soil surface.Conclusions
This study has highlighted the importance of MI stress of the soil surface in limiting shoot growth and has broad implications for plant genotype selection and agricultural systems management, particularly with regard to nutrition and tillage systems.2.
Robert P. Jeffery Richard J. Simpson Hans Lambers Daniel R. Kidd Megan H. Ryan 《Plant and Soil》2017,412(1-2):21-34
Aims
Trifolium subterraneum L. is the predominant annual pasture legume in southern Australia. Cultivars with improved phosphorus (P) foraging ability would improve the P-use efficiency of agricultural systems. We therefore investigated variation in root traits related to P-uptake among six cultivars.Methods
Micro-swards were grown at six levels of P in field soil with indigenous arbuscular mycorrhizal (AM) fungi for six weeks. Dry matter yield, tissue P concentration, rhizosphere carboxylates, AM fungal colonisation and root morphological traits were measured.Results
The cultivars showed similar shoot and root yield responses to P supply. Average root diameter did not change, specific root length (SRL) increased and root tissue density (RTD) decreased with increased P supply. Amounts of total rhizosphere carboxylates were low (<1.2 nmol cm?1 root). The percentage of root length colonised by AM fungi was greatest (29–43 %) at an intermediate level (8 mg kg?1 dry soil) of P supply.Conclusions
Most differences among cultivars were reasonably consistent across P supply levels, indicating greater numbers of lines could be screened reliably at a single P level. Low colonisation by AM fungi at low P supply deserves consideration when selecting soils for cultivar comparisons. Increased SRL and decreased RTD at high P supply likely result from self-shading within the micro-swards and warrant further investigation.3.
Inter- and intra-species intercropping of barley cultivars and legume species,as affected by soil phosphorus availability 总被引:1,自引:0,他引:1
Tegan Darch Courtney D. Giles Martin S. A. Blackwell Timothy S. George Lawrie K. Brown Daniel Menezes-Blackburn Charles A. Shand Marc I. Stutter David G. Lumsdon Malika M. Mezeli Renate Wendler Hao Zhang Catherine Wearing Patricia Cooper Philip M. Haygarth 《Plant and Soil》2018,427(1-2):125-138
Aims
Intercropping can improve plant yields and soil phosphorus (P) use efficiency. This study compares inter- and intra-species intercropping, and determines whether P uptake and shoot biomass accumulation in intercrops are affected by soil P availability.Methods
Four barley cultivars (Hordeum vulgare L.) and three legume species (Trifolium subterreneum, Ornithopus sativus and Medicago truncatula) were selected on the basis of their contrasting root exudation and morphological responses to P deficiency. Monocultures and barley-barley and barley-legume intercrops were grown for 6 weeks in a pot trial at very limiting, slightly limiting and excess available soil P. Above-ground biomass and shoot P were measured.Results
Barley-legume intercrops had 10–70% greater P accumulation and 0–40% greater biomass than monocultures, with the greatest gains occurring at or below the sub-critical P requirement for barley. No benefit of barley-barley intercropping was observed. The plant combination had no significant effect on biomass and P uptake observed in intercropped treatments.Conclusions
Barley-legume intercropping shows promise for sustainable production systems, especially at low soil P. Gains in biomass and P uptake come from inter- rather than intra-species intercropping, indicating that plant diversity resulted in decreased competition between plants for P.4.
Sabine Güsewell 《Plant and Soil》2017,415(1-2):57-72
Aims
Dauciform roots (DR) are formed by some Cyperaceae under phosphorus (P) deficiency. To advance our understanding of their physiological function, I ask: Is DR formation regulated by shoot P status or external P supply? How does it respond to nitrogen (N)? Do DR enhance root monoesterase, diesterase or phytase activities and ability to utilize organic P?Methods
Greenhouse experiments were carried out with two Carex species grown in sand with (1) different combinations of N and P supply, (2) local supply of N or P to root halves, and (3) different organic P forms.Results
Carex flava produced DR in all treatments. The density of DR and phosphatase activities increased with N supply; they were regulated by shoot P status and external N (but not P) supply. All phosphatase activities increased with DR density. Carex muricata produced no DR and had lower diesterase activity than C. flava but both species grew equally well with diester-P.Conclusions
DR and phosphatase activities are regulated by both N and P supply. Similar growth responses to nutrients in both species suggest small costs and benefits of DR under experimental conditions but confirmation is needed for plants grown on natural soils.5.
Background and aims
Iron (Fe) toxicity is a wide-spread stress in lowland rice production. The aim of this study was to differentiate between responses to acute Fe stress during the vegetative stage and chronic Fe stress throughout the growing period.Methods
Six rice genotypes were tested in a semi-artificial greenhouse setup, in which acute (almost 1500 mg L?1 Fe in soil solution during the vegetative stage) and chronic (200 to 300 mg L?1 Fe throughout the season) Fe toxicity were simulated.Results
Acute Fe stress induced early development of heavy leaf bronzing, whereas moderate symptoms occurred in the chronic treatment throughout the season. Grain yields were only reduced in the chronic stress treatment (?23 %) due to reductions in spikelet fertility, grain number and grain weight. Symptom formation during the early growth stages did not reflect yield responses in all genotypes. Only one genotype showed increases in grain Fe concentrations (24 % in the acute stress and 44 % in the chronic stress) compared to the control.Conclusions
Contrasting genotypes responded differently to acute and chronic Fe toxicity, and one genotype showed consistent tolerance and the ability to translocate excess Fe into grains. These traits can be useful in the adaptive breeding of rice for Fe toxic environments.6.
Courtney D. Giles Timothy S. George Lawrie K. Brown Malika M. Mezeli Alan E. Richardson Charles A. Shand Renate Wendler Tegan Darch Daniel Menezes-Blackburn Patricia Cooper Marc I. Stutter David G. Lumsdon Martin S. A. Blackwell Catherine Wearing Hao Zhang Philip M. Haygarth 《Plant and Soil》2017,412(1-2):43-59
Background and Aims
Plant acquisition of endogenous forms of soil phosphorus (P) could reduce external P requirements in agricultural systems. This study investigated the interaction of citrate and phytase exudation in controlling the accumulation of P and depletion of soil organic P by transgenic Nicotiana tabacum plants.Methods
N. tabacum plant lines including wild-type, vector controls, transgenic plants with single-trait expression of a citrate transporter (A. thaliana frd3) or fungal phytases (phyA: A. niger, P. lycii) and crossed plant lines expressing both traits, were characterized for citrate efflux and phytase exudation. Monocultures and intercropped combinations of single-trait plants were grown in a low available P soil (12 weeks). Plant biomass, shoot P accumulation, rhizosphere soil pH and citrate-extractable-P fractions were determined. Land Equivalent Ratio and complementarity effect was determined in intercropped treatments and multiple-linear-regression was used to predict shoot P accumulation based on plant exudation and soil P depletion.Results
Crossed plant lines with co-expression of citrate and phytase accumulated more shoot P than single-trait and intercropped plant treatments. Shoot P accumulation was predicted based on phytase-labile soil P, citrate efflux, and phytase activity (Rsq=0.58, P < .0001). Positive complementarity occurred between intercropped citrate- and phytase-exuding plants, with the greatest gains in shoot P occurring in plant treatments with A. niger phyA expression.Conclusions
We show for the first time that trait synergism associated with the exudation of citrate and phytase by tobacco can be linked to the improved acquisition of P and the depletion of soil organic P.7.
Abdul Rehman Muhammad Farooq Levent Ozturk Muhammad Asif Kadambot H. M. Siddique 《Plant and Soil》2018,422(1-2):283-315
Background
Zinc (Zn) deficiency is one of the most important micronutrient disorders affecting human health. Wheat is the staple food for 35% of the world’s population and is inherently low in Zn, which increases the incidence of Zn deficiency in humans. Major wheat-based cropping systems viz. rice–wheat, cotton–wheat and maize–wheat are prone to Zn deficiency due to the high Zn demand of these crops.Methods
This review highlights the role of Zn in plant biology and its effect on wheat-based cropping systems. Agronomic, breeding and molecular approaches to improve Zn nutrition and biofortification of wheat grain are discussed.Results
Zinc is most often applied to crops through soil and foliar methods. The application of Zn through seed treatments has improved grain yield and grain Zn status in wheat. In cropping systems where legumes are cultivated in rotation with wheat, microorganisms can improve the available Zn pool in soil for the wheat crop. Breeding and molecular approaches have been used to develop wheat genotypes with high grain Zn density.Conclusions
Options for improving grain yield and grain Zn concentration in wheat include screening wheat genotypes for higher root Zn uptake and grain translocation efficiency, the inclusion of these Zn-efficient genotypes in breeding programs, and Zn fertilization through soil, foliar and seed treatments.8.
Dingcheng Gao Vivek Mittal Yi Ban Ana Rita Lourenco Shira Yomtoubian Sharrell Lee 《生物学前沿》2018,13(4):277-286
Background
Metastasis is the primary cause of mortality in cancer patients. Therefore, elucidating the genetics and epigenetics of metastatic tumor cells and the mechanisms by which tumor cells acquire metastatic properties constitute significant challenges in cancer research.Objective
To summarize the current understandings of the specific genotype and phenotype of the metastatic tumor cells.Method and Result
In-depth genetic analysis of tumor cells, especially with advances in the next-generation sequencing, have revealed insights of the genotypes of metastatic tumor cells. Also, studies have shown that the cancer stem cell (CSC) and epithelial to mesenchymal transition (EMT) phenotypes are associated with the metastatic cascade.Conclusion
In this review, we will discuss recent advances in the field by focusing on the genomic instability and phenotypic dynamics of metastatic tumor cells.9.
Devendra Singh Mahendra Vikram Singh Rajawat Rajeev Kaushik Radha Prasanna Anil Kumar Saxena 《Plant and Soil》2017,416(1-2):107-116
Background and aim
Most of the food grains show deficiency of zinc. The study was carried out to evaluate the role of endophytes in the fortification of Zn in wheat genotypes with different nutrient use efficiency and in soils deficient and sufficient for Zn.Methods
Two zinc solubilizing endophytes (Bacillus subtilis DS-178 and Arthrobacter sp. DS-179) were used to inoculate low and high Zn accumulating genotypes in soils sufficient and deficient in Zn.Results
The data on different root morphological parameters, yield and accumulation of Zn indicated distinct variations among genotypes; soil types and also among the endophytes inoculated, un-inoculated and chemical fertilizer treatments. In general, the amount of Zn in grains due to inoculation of endophytes was 2 folds higher as compared to un-inoculated control. The low and high Zn accumulating genotypes responded in an almost identical manner to endophyte inoculation, irrespective of the soil types.Conclusion
Zn solubilizing endophytes can enhance the translocation and enrichment of Zn to grains in wheat genotypes, irrespective of their different nutrient use efficiency (Zn). This approach can be integrated into the modern strategies for biofortification.10.
Maé Guinet Bernard Nicolardot Cécile Revellin Vincent Durey Georg Carlsson Anne-Sophie Voisin 《Plant and Soil》2018,432(1-2):207-227
Aims
A better understanding of how plant growth, N nutrition and symbiotic nitrogen fixation (SNF) are influenced by soil inorganic N availability, for a wide range of legume species, is crucial to optimise legume productivity, N2 fixation, while limiting environmental risks such as N leaching.Methods
A comparative analysis was performed for ten legume crops, grown in a field experiment and supplied with four N fertiliser rates. Dry matter, N concentration and SNF were measured. In parallel, root elongation rates were studied in a greenhouse experiment.Results
For most species, N fertilisation had little effect on plant growth and N accumulation. SNF was reduced by soil inorganic N available at sowing but with large differences in the magnitude of the response among species. The response varied according to plant N requirements for growth and plant ability to retrieve inorganic N. Accordingly, root lateral expansion rate measured in RhizoTubes was highly correlated with plant ability to retrieve inorganic N measured in the field experiment.Conclusion
Combining SNF response to soil inorganic N, shoot N and plant ability to retrieve inorganic N, allowed a robust evaluation of differential response to soil inorganic N among a wide range of legume species.11.
Zinc uptake by roots and accumulation in maize plants as affected by phosphorus application and arbuscular mycorrhizal colonization 总被引:1,自引:0,他引:1
Wei Zhang Xiu-Xiu Chen Yu-Min Liu Dun-Yi Liu Xin-Ping Chen Chun-Qin Zou 《Plant and Soil》2017,413(1-2):59-71
Background and aims
Phosphorus (P) application reduces the zinc (Zn) concentration of cereal grain, but the mechanisms, including root Zn accumulation, remain controversial.Methods
Field and pot experiments were conducted to determine the degree to which root Zn accumulation, root arbuscular mycorrhizal (AM) colonization, and other factors contribute to the negative interaction between P and Zn.Results
Root Zn accumulation was positively related to shoot Zn accumulation. In responding to P application, root Zn accumulation was more affected by changes in AM colonization than by changes in root dry weight (RDW). In the pot experiment without Zn supply, root Zn concentration (RZnC), RDW, and AM colonization together explained 98% (adjusted R2 value) of the decrease in root Zn accumulation with P application, while AM colonization and RDW explained 66% (adjusted R2 value) of decrease in total Zn accumulation. In the pot experiment with Zn sufficient supply, RZnC and RDW explained 89% (adjusted R2 value) of the decrease in root Zn accumulation with increasing P application, while RDW, RZnC, and AM colonization explained 53% (adjusted R2 value) of the decrease in total Zn accumulation.Conclusion
Especially in Zn-deficient soil, root Zn accumulation explains much of the negative interaction between P and Zn, and root Zn accumulation is greatly affected by AM colonization.12.
Background and aims
Rice grains contaminated by mercury (Hg) and methylmercury (MeHg) pose risks to human health. This study evaluated the relative importance of genotype, environment and genotype-environment interactions on the accumulation of total Hg (THg) and MeHg in brown rice.Methods
A pot trial with four rice genotypes and 10 Hg-contaminated paddy soils was conducted under greenhouse conditions. The effects of genotype, environment and genotype-environment interactions on brown rice THg and MeHg accumulation were assessed by an Additive Main Effects and Multiplicative Interaction (AMMI) model.Results
THg and MeHg concentrations in brown rice ranged from 20.5 to 75.5 μg kg?1 and 2.24 to 54.7 μg kg?1, respectively. The AMMI model indicated that genotype explained 41.1 and 19.6%, environment described 40.6 and 55.8%, and the genotype-environment interaction explained 11.9 and 20.0% of the variation in brown rice THg and MeHg levels, respectively. Brown rice THg positively correlated with water-soluble Hg and total potassium, but negatively correlated with total sulphur, iron, total organic carbon and nickel in soils. Brown rice MeHg negatively correlated with soil pH and selenium.Conclusion
THg accumulation in brown rice was mainly affected by both genotype and environment, whereas MeHg accumulation was largely determined by environment.13.
Bijan Keikhaei Pejman Salehi-Fard Mostafa Paridar Mehraneh Karimzadeh Razie Dehghani Asma Zamiri Vahideh Takhviji 《生物学前沿》2018,13(6):469-474
Background
Thalassemia is known as the commonest monogenic disorder with an imbalanced rate of globin chains production of adult hemoglobin. Despite the available information about the thalassemia etiology, its phenotype varies from each patient to another. This study aimed to evaluate the hematological parameters of patients with the same -α3.7 homozygote and heterozygote genotypes to amend screening programs.Methods
In this observational study, we evaluated 1301 thalassemia suspected patients who referred to the Thalassemia and Hemoglobinopathy Research Center of Ahvaz University of Medical Sciences, Khuzestan, Iran during 2014–2016. According to the genotyping studies, patients divided into 2 groups with -α3.7/αα (n = 646) and -α3.7/-α3.7 (n = 181) genotypes. Thereafter, distribution of hematological parameters evaluated in both groups.Results
The mean age in heterozygous and homozygous groups was 25.7±4.5 and 26±4.4 years old, respectively. The degree of anemia was considerably varied in patients with the same genotype. MCV, RBC and MCH showed a wide distribution in patients.Conclusion
The findings presented here suggest that other molecular mechanisms along with α-globin gene mutations could be involved in determining the phenotypes of alpha thalassemia patients.14.
Pamela Moussavou-Boundzanga Ismaël Hervé Koumakpayi Ingrid Labouba Eric M. Leroy Ernest Belembaogo Nicolas Berthet 《Virology journal》2017,14(1):241
Background
Cervical cancer is the fourth most common malignancy in women worldwide. However, screening with human papillomavirus (HPV) molecular tests holds promise for reducing cervical cancer incidence and mortality in low- and middle-income countries. The performance of the Abbott RealTime High-Risk HPV test (AbRT) was evaluated in 83 cervical smear specimens and compared with a conventional nested PCR coupled to high-throughput sequencing (HTS) to identify the amplicons.Results
The AbRT assay detected at least one HPV genotype in 44.57% of women regardless of the grade of cervical abnormalities. Except for one case, good concordance was observed for the genotypes detected with the AbRT assay in the high-risk HPV category determined with HTS of the amplicon generated by conventional nested PCR.Conclusions
The AbRT test is an easy and reliable molecular tool and was as sensitive as conventional nested PCR in cervical smear specimens for detection HPVs associated with high-grade lesions. Moreover, sequencing amplicons using an HTS approach effectively identified the genotype of the hrHPV identified with the AbRT test.15.
Philip J. White John E. Bradshaw Lawrie K. Brown M. Finlay B. Dale Lionel X. Dupuy Timothy S. George John P. Hammond Nithya K. Subramanian Jacqueline A. Thompson Jane Wishart Gladys Wright 《Plant and Soil》2018,432(1-2):45-63
Aims
Potato (Solanum tuberosum L.) has a large phosphorus (P)-fertiliser requirement. This is thought to be due to its inability to acquire P effectively from the soil. This work tested the hypothesis that early proliferation of its root system would enhance P acquisition, accelerate canopy development, and enable greater yields.Methods
Six years of field experiments characterised the relationships between (1) leaf P concentration ([P]leaf), tuber yield, and tuber P concentration ([P]tuber) among 27 Tuberosum, 35 Phureja and 4 Diploid Hybrid genotypes and (2) juvenile root vigour, P acquisition and tuber yield among eight Tuberosum genotypes selected for contrasting responses to P-fertiliser.Results
Substantial genetic variation was observed in tuber yield, [P]leaf and [P]tuber. There was a strong positive relationship between tuber yields and P acquisition among genotypes, whether grown with or without P-fertiliser. Juvenile root vigour was correlated with accelerated canopy development and both greater P acquisition and tuber biomass accumulation early in the season. However, the latter relationships became weaker during the season.Conclusions
Increased juvenile root vigour accelerated P acquisition and initial canopy cover and, thereby, increased tuber yields. Juvenile root vigour is a heritable trait and can be selected to improve P-fertiliser use efficiency of potato.16.
Gustavo Boitt Amanda Black Steve A. Wakelin Richard W. McDowell Leo M. Condron 《Plant and Soil》2018,427(1-2):163-174
Aims
We assessed and quantified the cumulative impact of 20 years of biomass management on the nature and bioavailability of soil phosphorus (P) accumulated from antecedent fertiliser inputs.Methods
Soil (0–2.5, 2.5–5, 5–10 cm) and plant samples were taken from replicate plots in a grassland field experiment maintained for 20 years under contrasting plant biomass regimen- biomass retained or removed after mowing. Analyses included dry matter production and P uptake, root biomass, total soil carbon (C), total nitrogen (N), total P, soil P fractionation, and 31P NMR spectroscopy.Results
Contemporary plant production and P uptake were over 2-fold higher for the biomass retained compared with the biomass removed regimes. Soil C, total P, soluble and labile forms of inorganic and organic soil P were significantly higher under biomass retention than removal.Conclusions
Reserves of soluble and labile inorganic P in soil were significantly depleted in response to continued long-term removal of P in plant biomass compared to retention. However, this was only sufficient to sustain plant production at half the level observed for the biomass retention after 20 years, which was partly attributed to limited mobilisation of organic P in response to P removal.17.
Lawrie K. Brown Timothy S. George Konrad Neugebauer Philip J. White 《Plant and Soil》2017,412(1-2):115-132
Aims
Phosphorus (P) is frequently limiting crop production in agroecosystems. Large progress was achieved in understanding root traits associated with P acquisition efficiency (PAE, i.e. P uptake achieved under low P conditions). Most former studies were performed in controlled environments, and avoided the complexity of soil-root interactions. This may lead to an oversimplification of the root-soil relations. The aim of the present study was, therefore, to identify the dominant root and rhizosphere-related traits determining PAE, in contrasting soil conditions in the field.Methods
Twenty-three maize hybrids were grown at two contrasting P levels of a long-term P-fertilizer trial in two adjacent soil types: alkaline and neutral. Bulk soil, rhizosphere and root parameters were studied in relation to plant P acquisition.Results
Soil type had robust effect on PAE. Hybrids’ performance in one soil type was not related to that in the other soil type. In the neutral soil, roots exhibited higher specific root length, higher root/shoot ratio but lower PAE. Best performing hybrids in the neutral soil were characterized by top soil exploration, i.e., greater root surface and topsoil foraging. In contrast, in the alkaline soil, PAE and foraging traits were not correlated, P availability in the rhizosphere was greater than the bulk soil and phosphatase activity was higher, suggesting a ‘mining strategy’ in that case (i.e. traits that facilitate elevated P availability).Conclusions
These results indicate the key role of environmental factors for roots traits determining high PAE. The study highlights the need to consider soil properties when breeding for high PAE, as various soil types are likely to require different crop ideotypes.18.
Silvia Gschwendtner Marion Engel Tillmann Lueders Franz Buegger Michael Schloter 《Plant and Soil》2016,409(1-2):203-216
Background and aims
Variation in fire intensity within an ecosystem is likely to moderate fire effects on plant and soil properties. We tested the effect of fire intensity on grassland biomass, soil microbial biomass, and soil nutrients. Additional tests determined plant-microbe, plant-nutrient, and microbe-nutrient associations.Methods
A replicated field experiment produced a fire intensity gradient. We measured plant and soil microbial biomasses at peak plant productivity the first growing season after fire. We concurrently measured flux in 11 soil nutrients and soil moisture.Results
Fire intensity positively affected soil nitrogen, phosphorus (P), and zinc but did not appreciably affect plant biomass, microbial biomass, and other soil nutrients. Plant biomass was seemingly (co-)limited by boron, manganese, and P. Microbial biomass was (co-)limited mainly by P and also iron.Conclusions
In the Northern Great Plains, plant and soil microbial biomasses were limited mainly by P and some micronutrients. Fire intensity affected soil nutrients, however, pulsed P (due to fire) did not result in appreciable fire intensity effects on plant and microbial biomasses. Variable responses in plant productivity to fire are common and indicate the complexity of factors that regulate plant production after fire.19.
Alberto Benavent-González Manuel Delgado-Baquerizo Laura Fernández-Brun Brajesh K. Singh Fernando T. Maestre Leopoldo G. Sancho 《Plant and Soil》2018,422(1-2):35-49
Background and aims
Plant breeding activities shape the rhizosphere microbiome but less is known about the relationship of both with the seed microbiome. We analyzed the composition of bacterial communities of seeds and rhizospheres of Styrian oil pumpkin genotypes in comparison to bulk soil to elucidate specific microbial signatures to support a concept involving plant-microbe interactions in breeding strategies.Methods
The seed and rhizosphere microbiomes of 14 genotypes of oilseed pumpkin and relatives were analyzed using a 16S rRNA gene amplicon sequencing approach, which was assessed by bioinformatics and statistical methods.Results
All analyzed microhabitats were characterized by diverse bacterial communities, but the relative proportions of phyla and the overall diversity was different. Seed microbiomes were characterized by the lowest diversity and dominant members of Enterobacteriaceae including potential pathogens (Erwinia, Pectobacterium). Potential plant-beneficial bacteria like Lysobacter, Paenibacillus and Lactococcus contributed to the microbial communities in significant abundances. Interestingly, strong genotype-specific microbiomes were detected for seeds but not for the rhizospheres.Conclusions
Our study indicates a strong impact of the Cucurbita pepo genotype on the composition of the seed microbiome. This should be considered in breeding of new cultivars that are more capable of exploiting beneficial indigenous microbial communities.20.
Bjorn J. M. Robroek Remy J. H. Albrecht Samuel Hamard Adrian Pulgarin Luca Bragazza Alexandre Buttler Vincent EJ Jassey 《Plant and Soil》2016,399(1-2):135-146