水杨酸对锌胁迫下小麦幼苗生长抑制的缓解效应

以小麦品种‘新麦18’为材料,采用室内水培实验研究了不同浓度水杨酸(SA)处理对300 mg.L-1锌胁迫下小麦种子萌发和幼苗生长的影响。结果表明:在Zn2+胁迫下,小麦种子的发芽势和发芽率、幼苗根长、芽长以及幼苗叶片的可溶性蛋白含量、根系活力显著降低,而脯氨酸和丙二醛(MDA)含量显著增加(P<0.05);外施SA显著提高了Zn2+胁迫下小麦种子的发芽势和发芽率,同时也使Zn2+胁迫7 d后的小麦幼苗的根长、芽长,幼苗叶片的脯氨酸和可溶性蛋白含量以及根系活力显著升高,膜脂过氧化产物MDA含量却显著降低(P<0.05)。由此可见,外施SA可通过提高小麦幼苗根长和芽长来增加幼苗根系活力,通过提高小麦幼苗可溶性蛋白含量、脯氨酸含量来维持细胞膜的稳定性,降低膜脂过氧化伤害程度,从而缓解了Zn2+胁迫对幼苗生长的抑制,并以14 mg.L-1外源水杨酸缓解效果最好。     

水分胁迫下丛枝菌根真菌对枳实生苗生长和渗透调节物质含量的影响

采用盆栽试验研究了水分胁迫下接种丛枝菌根真菌摩西球囊霉(Glomaus mosseae)对枳[Poncirustrifoliat(L.)Raf.]实生苗的生长和渗透调节物质含量的影响.结果表明,在土壤含水量为20%、16%和12%条件下,接种G.mosseae能够增加植株的生长(株高、茎粗、叶面积、地上部干重、地下部干重和植株干重),促进植株根系活跃吸收面积和根际土壤有效磷的吸收,提高叶片和根系可溶性糖含量的积累,降低叶片脯氨酸含量,增强植株的水分利用效率(达20%～40%),使枳实生苗的抗旱能力得到增强.土壤含水量为20%和16%条件下接种G.mosseae对植株的效果较土壤含水量为12%条件下更显著.12%的土壤含水量严重抑制Gmosseae的侵染,说明丛枝菌根侵染程度轻,其对植物的效果也差.     

Salicylic Acid Improves Nitrogen Fixation,Growth, Yield and Antioxidant Defence Mechanisms in Chickpea Genotypes Under Salt Stress

Journal of Plant Growth Regulation - Salinization of farming soils is a major abiotic stress hampering crop growth and productivity globally. Chickpea is a vital legume crop, being cultivated...     

SA浸种对盐胁迫下小麦种子萌发和幼苗生长的影响

以小麦盐敏感品种鲁麦15为材料,研究了外源水杨酸(salicylic acid,SA)浸种对100 mmol/L NaCl胁迫下小麦种子萌发和幼苗生长的影响。研究结果表明:盐胁迫下,无论经SA浸种还是未经SA浸种,小麦幼苗的生长均受到明显抑制,干、鲜重显著下降;0.1 mmol/L、0.2 mmol/L和0.3 mmol/L SA溶液浸种均能显著缓解NaCl胁迫对小麦幼苗生长的抑制,其中以0.2 mmol/L SA溶液浸种预处理效果最好。实验中,0.2 mmol/L SA浸种可显著提高盐胁迫下小麦种子β-淀粉酶的活性和吸胀速率。此外,与未经SA浸种的盐胁迫小麦幼苗相比,0.2 mmol/L SA浸种的盐胁迫小麦幼苗整株的干、鲜重显著增加,幼苗体内Na~+含量降低,K~+含量和K~+/Na~+比值显著提高;同时,小麦幼苗叶片中超氧化物歧化酶(superoxide dismutase,SOD)、过氧化氢酶(catalase,CAT)、过氧化物酶(peroxidase,POD)活性升高,而丙二醛(MDA)含量则显著降低。由此可以得出,SA浸种能有效提高盐胁迫下小麦幼苗体内K~+/Na~+比值,提高SOD、CAT和POD的活性,减轻膜脂过氧化程度,以缓解盐胁迫对小麦幼苗生长的抑制作用,从而提高耐盐性。     

Evaluating the Growth Potential of Pathogenic Bacteria in Water

The degree to which a water sample can potentially support the growth of human pathogens was evaluated. For this purpose, a pathogen growth potential (PGP) bioassay was developed based on the principles of conventional assimilable organic carbon (AOC) determination, but using pure cultures of selected pathogenic bacteria (Escherichia coli O157, Vibrio cholerae, or Pseudomonas aeruginosa) as the inoculum. We evaluated 19 water samples collected after different treatment steps from two drinking water production plants and a wastewater treatment plant and from ozone-treated river water. Each pathogen was batch grown to stationary phase in sterile water samples, and the concentration of cells produced was measured using flow cytometry. In addition, the fraction of AOC consumed by each pathogen was estimated. Pathogen growth did not correlate with dissolved organic carbon (DOC) concentration and correlated only weakly with the concentration of AOC. Furthermore, the three pathogens never grew to the same final concentration in any water sample, and the relative ratio of the cultures to each other was unique in each sample. These results suggest that the extent of pathogen growth is affected not only by the concentration but also by the composition of AOC. Through this bioassay, PGP can be included as a parameter in water treatment system design, control, and operation. Additionally, a multilevel concept that integrates the results from the bioassay into the bigger framework of pathogen growth in water is discussed. The proposed approach provides a first step for including pathogen growth into microbial risk assessment.Pathogenic bacteria can survive and also grow in low-nutrient aquatic environments, such as surface waters or man-made water treatment systems (2, 17, 30). Studies on pathogen survival and/or die-off (including disinfection) in water are common, but little is known about the fundamental factors governing their growth in the environment (34, 35). Understanding the growth of pathogenic bacteria in aquatic ecosystems is essential for a holistic approach to microbial risk assessment as well as for improving drinking water treatment design and operation.A key factor governing growth of all organisms is nutrient availability. All human pathogens are heterotrophs, utilizing organic compounds as their carbon and energy source. Natural organic matter in water comprises a broad spectrum of many different compounds; it is usually determined as a bulk parameter, such as dissolved organic carbon (DOC). Only a fraction (0.1 to 44%) of this DOC pool is readily available for bacterial growth (18, 33). This bioavailable fraction is quantified using bioassays, such as the biodegradable dissolved organic carbon (BDOC) assay (27) or the assimilable organic carbon (AOC) assay (31). Typically, AOC represents small molecules readily available for growth, whereas BDOC can also include larger molecular compounds, which require predegradation before they can be taken up by microbial cells. Results from both of these assays are commonly used as indicators for bacterial growth potential and have previously been associated with regrowth and biofilm formation in drinking water distribution systems (7, 20, 32).Previous studies have pointed toward an apparent correlation between the concentration of AOC and the presence of enteric bacteria. For example, during two large surveys of drinking water treatment systems across North America, the occurrence (presence/absence) of coliform bacteria was found to be elevated above an AOC concentration of 100 μg liter⁻¹ (4, 21). Other studies also found that AOC concentrations were directly correlated to growth of pathogenic bacteria (30, 34, 35). However, AOC is a bulk parameter, which includes many different substrates (e.g., amino acids, sugars, and fatty acids) readily available for heterotrophic growth. Hence, its composition can differ distinctly, and it is assumed that every aquatic environment carries a complex and unique “fingerprint” of utilizable organic carbon compounds (22). Moreover, the spectrum of growth-supporting substrates (carbon compounds) of individual bacterial strains is specific—a fact also used for the classification of bacteria for taxonomic purposes. This principle has been integrated into conventional AOC assays, where the specific substrate spectrum of different pure cultures can be used to quantify different types of compounds present in water (26, 33). The term “pathogenic bacteria” is a collective term for many different bacterial species that can all cause disease in humans but their individual substrate spectra are unique for each species. Thus, we have hypothesized that the total concentration of AOC alone is not a sufficient parameter for describing the growth potential of pathogenic bacteria; the quality of the available carbon compounds has to be considered as well.There is no existing method that is capable of fractionating organic carbon in a way that allows for the quantification of individual compounds that support growth of specific pathogens. In this study, we have developed a pathogen growth potential (PGP) assay by combining the conventional AOC assay (31) with flow cytometric quantification of bacterial growth (11) and using pathogens as inocula. The PGP assay yields two main results, namely, (i) the extent of pathogen growth, and (ii) the relative fraction of AOC consumed by a pathogen. With this approach, we investigated the growth potential of three model pathogens from three different genera, namely, Escherichia coli O157, Vibrio cholerae O1, and Pseudomonas aeruginosa, in a broad range of water samples, differing considerably in their origin and quality.     

Mechanistic Elucidation of Salicylic Acid and Sulphur-Induced Defence Systems,Nitrogen Metabolism,Photosynthetic, and Growth Potential of Mungbean (Vigna radiata) Under Salt Stress

The potential of plant nutrients (such as sulphur, S) and phytohormones (such as salicylic acid, SA) has been explored in isolated studies by researchers in controlling the impact of abiotic stresses such as salinity in plants. However, information is scanty on the major mechanisms underlying the role of S and/or SA in modulation of enzymes involved in nitrogen (N) assimilation, GOGAT cycle, and antioxidant defence system; the cellular status of N-containing osmolyte proline, glucose, S-containing compounds; and their cumulative role in photosynthesis functions and growth in crop plants. The present study aimed to assess the role of cumulative effect of SA and S (SO₄²⁻) mediated induction of N assimilatory enzymes, GOGAT cycle, N-osmolyte proline and its metabolizing enzymes, glyoxylase enzymes, and antioxidant capacity in mungbean (Vigna radiata L.) exposed to NaCl with or without SO₄²⁻ and SA. Salt-exposed V. radiate showed differential elevations in damage (O^.₂⁻, H₂O₂, lipid peroxidation; glucose) and defence (ascorbate peroxidase, APX; glutathione reductase, GR; superoxide dismutase, SOD; reduced GSH; proline) and inhibitions in the activities of NR and NiR; N content, photosynthesis, photosynthetic N-use-efficiency (NUE), and growth. The separate supplementation of SA and SO₄²⁻ to 50 mM NaCl almost equally strengthened the antioxidant machinery and diminished NaCl-accrued damages. However, combined supply of SA and SO₄²⁻ to NaCl-exposed cultivars led to significant improvements in NR and NiR activities, the accumulation of N, GSH, proline, enhanced activity of APX, GR, and reduced activity of SOD, and also decreases in O^.₂⁻, H₂O₂, lipid peroxidation and glucose. These observations were corroborated with SA, SO₄²⁻ and NaCl-mediated changes in the traits of photosynthesis and growth, stomatal behaviour, and the polypeptide patterns of Rubisco in V. radiata. Overall, in V. radiata, SA-mediated higher enhancements in the activity of N assimilatory enzymes (NR, NiR, and GS), increase in the N and proline, and GSH; and decreases in the contents of Na⁺ and Cl⁻ ions, and glucose (a photosynthesis repressor); maintenance of a fine tuning among SOD, APX, and GR enzymes; and higher minimization of ROS (O^.₂⁻, H₂O₂) and lipid peroxidation finally led to a higher promotion in photosynthesis and growth.

     

水杨酸对受高温胁迫的葡萄幼苗光合作用和同化物分配的影响

0．1mmol．L^-1水杨酸处理高温胁迫下的葡萄幼苗叶片,能提高其调运同化物的能力,其本身的光合能力也可提高。     

Effects of S-Abscisic Acid (S-ABA) on Seed Germination,Seedling Growth,and Asr1 Gene Expression Under Drought Stress in Maize

The objective of this study was to evaluate the ability of the phytohormone S-abscisic acid (S-ABA) to protect maize seedlings grown under drought stress and to measure their increased drought tolerance. The maize hybrids ‘Zhengdan 958’ (ZD958; drought tolerant) and ‘Xundan 20’ (XD20; drought sensitive) were treated with nutrient solutions of different concentrations (1, 2, 4, 8, and 10 mg/kg) of S-ABA under polyethylene glycol (PEG, 15% w/v, MW 6000) simulated drought stress. Optimal concentrations of S-ABA were designed to be sprayed onto the leaves of seedlings, and their effect on endogenous ABA, malondialdehyde (MDA), osmotic substances, antioxidant enzyme activities, and Asr1 gene expression in seedlings were studied. Results indicated that, under drought stress, S-ABA treatment significantly improved maize seed germination rate (GR), germination energy (GE), and seedling biomass (p < 0.05). After spraying 4 mg/kg S-ABA onto leaves, the endogenous hormone ABA, osmotic substances, antioxidant enzyme activities, and expressive quantity of the Asr1 gene were extended and MDA content dropped significantly (p < 0.05). Moreover, ZD 958 endogenous ABA content, osmotic substances content, antioxidant enzyme activity and Asr1 gene expressive quantity were higher than that of XD 20 (p < 0.05). In conclusion, S-ABA treatment increased the content of endogenous ABA, induced an increase in antioxidant enzyme activity and Asr1 gene expression level, reduced the oxidative damage caused by drought to maize leaves, and improved the adaptability of maize seedlings to withstand drought stress. The promoting effect of S-ABA on the drought-tolerant variety ZD 958 was more obvious (p < 0.05). These results serve as a reference for the use of S-ABA in mitigating drought stress in maize.

     

Water Potential and Stomatal Resistance of Sunflower and Soybean Subjected to Water Stress during Various Growth Stages

Plants of two varieties of soybean (Glycine max (L.) Merr.) and two varieties of sunflower (Helianthus annuus L.) were grown in controlled environments and subjected to water stress at various stages of growth. Leaf resistances and leaf water potentials were measured as stress developed. In soybeans the upper leaf surface had a higher resistance than the lower surface at all leaf water potentials and growth stages. Resistance of the upper surface began to increase at a higher water potential and increased more than the resistance of the lower surface. Resistances returned to prestress values 4 days after rewatering. In sunflowers upper and lower leaf surfaces had similar resistances at all water potentials and growth stages. Leaf resistances were higher in sunflower plants stressed before flowering than in those stressed later. Sunflower plants stressed to −16 bars recovered their prestress leaf resistance and water potential a few days after rewatering, but leaves of sunflower plants stressed to −23 bars died. Leaves of soybean and sunflower plants stressed before flowering suffered less injury than those of older plants and sunflowers stressed after flowering suffered more injury than soybeans.     

NaCl胁迫下水杨酸和阿斯匹林对小麦幼苗体内ATP含量的影响

水杨酸被广泛地用于植物抗病研究,人们发现水杨酸及其类似物往往诱导植物产生抗盐生理性状,认为水杨酸可能与植物抗盐性有关［１～７］;盐分胁迫条件下植物生长降低、代谢受到抑制的原因之一是由于盐分胁迫导致植物能量代谢失衡［８］,ＡＴＰ作为植物维持生命活动最重...     

Effects of Exogenous Salicylic Acid and Nitric Oxide on Physiological Characteristics of Perennial Ryegrass Under Cadmium Stress

The effects of Cd, in combination with salicylic acid (SA) and sodium nitroprusside (SNP), on ryegrass seedlings were studied. Exposure of plants to 0.1 mM CdCl₂ for 2 weeks resulted in toxicity symptoms such as chlorosis and necrotic spots on leaves. The addition of 0.2 mM SA or 0.1 mM SNP slightly alleviated the toxic effects of Cd. After application of both SA and SNP, these symptoms significantly decreased. Treatment with Cd resulted in a decrease of dry weight of roots and shoots, chlorophyll content, net photosynthetic rate (P _n), transpiration rate (T _r), and the uptake and translocation of mineral elements. In Cd-treated plants, levels of lipoxygenase activity and malondialdehyde, hydrogen peroxide (H₂O₂), and proline contents significantly increased, whereas the activities of antioxidant enzymes, such as superoxide dismutase, guaiacol peroxidase, catalase, and ascorbate peroxidase, decreased in both roots and shoots. The results indicated that Cd caused physiological stresses in ryegrass plants. The Cd-stressed plants exposed to SA or SNP, especially to SA + SNP, exhibited improved growth compared with Cd-stressed plants. Application of SA or SNP, especially the combination SA + SNP, considerably reduced root-to-shoot translocation of Cd and increased the activities of antioxidant enzymes in both roots and shoots of Cd-stressed plants. The interaction of SA and SNP increased chlorophyll content, P _n and T _r in leaves, and the uptake and translocation of mineral elements, and decreased lipid peroxidation and H₂O₂ and proline accumulation in roots and shoots. These results suggest that SA or SNP, and, in particular, their combination counteracted the negative effects of Cd on ryegrass plants.     

Population Dynamics and Identification of Endophytic Bacteria Antagonistic Toward Plant-Pathogenic Fungi in Cotton Root

The antagonistic potentials of endophytic bacteria isolated from the roots of six cotton cultivars at different developmental stages were determined in vitro toward three pathogens: Verticillium dahliae Kleb V107 and V396 and Fusarium oxysporum f.sp. vasinfectum (F108). The populations of antagonistic endophytic bacteria (AEB) toward V107, V396, and F108 at the flowering and maturation stages were significantly higher than those at the seedling stage were. More AEB were found to be antagonistic toward pathogens V396 and F108 than V107. Results from the multivariate analysis of variance showed that the populations of AEB were significantly different for the main factors of cultivars, stages, and their interactions. Based on 16S rDNA sequence analysis, the 39 AEB isolates that antagonized V107, V396, and F108 (BAEB) consisted of seven genera, in which the genus of Enterobacter (17 out of 39) and Pantoea (14 out of 39) were predominant among the BAEB isolates. Characterized by BOX-PCR fingerprints, these 39 BAEB isolates represented 35 different cluster types. To explore the antagonistic mechanisms, the agar diffusion method was used to detect cell-wall-degrading enzyme activity and siderophore secretion. Nearly half of these BAEB isolates showed protease and chitinase activity, while all 39 BAEB isolates excreted siderophores. However, pectinase, cellulase, and xylanase activity were hardly detected. A germination experiment revealed that nine of the 39 BAEB isolates significantly improved the vigor index of the cotton seedlings.     

Ca2＋／CaM对渗透胁迫下小麦幼苗根和叶中ABA含量的影响（简报）＿

渗透胁迫下小麦根及叶片中ABA含量增加,根部先于叶片,同等渗透胁迫条件下,外源Ca2 浓度越小,根中ABA含量增加越多。EGTA和TFP浓度越大,ABA合成越早,且含量越高。     

Modulation of Reserve Mobilization by Sucrose,Glutamine, and Abscisic Acid During Seedling Establishment in Sunflower

We carried out in vitro feeding experiments using sunflower as a model to differentiate the modulatory effects of metabolites (sucrose and glutamine) and hormones (gibberellic acid and abscisic acid) on reserve mobilization, metabolite partitioning, and key enzyme activities. Exogenous sucrose negatively not only modulated the mobilization of carbon reserves (oils and starch), but it also delayed the degradation of nitrogen reserves (storage proteins) in the cotyledons. Similarly, exogenous glutamine negatively not only modulated storage protein hydrolysis, but it also retarded oil and starch degradation. Different from the metabolites, exogenous abscisic acid affected only the mobilization of oils and storage proteins. Sucrose and glutamine caused non-reducing sugar accumulation in the cotyledons and axis, but abscisic acid did not change the content of these compounds in both seedling parts. Curiously, glutamine failed to cause amino acid accumulation in the cotyledons and abscisic acid increased the amino acid content in both cotyledons and axis. Gibberellic acid did not stimulate reserve mobilization and metabolite consumption. Although the mobilization of oils, storage proteins, and starch has been delayed by sucrose and glutamine, these metabolites augmented the activity of isocitrate lyase, acid proteases, and amylases. Only abscisic acid reduced amylase activity and increased glutamine synthetase activity. Accordingly, sucrose and glutamine exert a “crossed effect” on reserve mobilization, that is, sucrose delays storage protein hydrolysis and glutamine retards oil and starch degradation. These effects may be mediated by non-reducing sugars and they are, at least in part, different from those exerted by abscisic acid.     

Effects of 5-Aminolevulinic Acid on Oilseed Rape Seedling Growth under Herbicide Toxicity Stress

Weeds are one of the major constraints in oilseed Brassica production. Use of effective herbicides to control weeds in the fields is one of the major objectives of agronomists. To improve weed control efficacy and minimize the application costs, complex combinations of 5-aminolevulinic acid (ALA) and a new postemergence herbicide, propyl 4-(2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamino)benzoate (ZJ0273), were used to investigate their combined effects in relation to seedling growth and development of oilseed rape (Brassica napus cv. ZS 758). Brassica seeds were treated with different concentrations of ZJ0273 [100 (normal dose for rape), 200, 500, and 1000 mg/L] and ALA (0.1, 1, 10, and 50 mg/L). ALA was applied as pre- and post-treatment alone and in combination with ZJ0273. We found that ZJ0273 stress imposed negative effects on rape seedling growth. Shoot fresh weight, shoot length, and root fresh weight were inhibited significantly under ZJ0273 stress, and the rate of decline increased consistently with increased ZJ0273 concentration. Root oxidizability was also inhibited significantly under ZJ0273 stress conditions, and the higher the concentration of the herbicide ZJ0273, the lower the oxidizability. Herbicide ZJ0273 treatment produced a gradual decrease in antioxidant enzymes (peroxidase, superoxide dismutase, and ascorbate peroxidase) and an increase in peroxidation substance (malondialdehyde accumulation). The increase and decrease were consistent with the ZJ0273 dosage. Our results indicated that pre- and post-treatments with a lower dosage of ALA (1 mg/L) improved rape seedling growth and root oxidizability parameters, whereas a higher concentration of ALA (50 mg/L) depressed growth. We also found that plants treated with 1 mg/L ALA produced the highest shoot fresh weights, shoot lengths, root fresh weights, and root oxidizability when the seeds were treated with different concentrations of ZJ0273. Lower dosages of ALA improved the activities of antioxidant enzymes, whereas the highest dosage of ALA increased the accumulation of peroxidation substance. These results indicate that ALA has promotive effects in the recovery of growth and development of rape seedlings under herbicide ZJ0273 toxicity stress.     

水分胁迫及复水过程中小麦幼苗叶片内Ca2+的定位

展现了冬小麦幼苗在干旱胁迫及干旱后复水过程中叶肉细胞内Ca2 的动态分布 :在正常水分条件下生长的小麦幼苗 ,其细胞中的Ca2 主要位于液泡内 ,同时 ,细胞间隙中有大量的Ca2 分布。在水分胁迫下 ,随着胁迫时间的加长 ,液泡和细胞间隙的Ca2 逐渐进入细胞质 ,导致细胞质中自由Ca2 浓度过高 ,并对细胞造成伤害。复水后 ,细胞质中高浓度Ca2 迅速排入液泡和细胞间隙 ,细胞质中Ca2 浓度又基本恢复正常水平 ,形象地展示了细胞内Ca2 的稳态调控机制     

外源水杨酸对高温胁迫下葡萄几种抗氧化酶活性和抗氧化物含量的影响

本文以二年生‘克瑞森’无核葡萄为材料,探明外源水杨酸（SA）对高温胁迫下葡萄体内几种酶活性和抗氧化物质含量的影响及其在抗高温胁迫中的作用。实验结果表明,与对照相比,外源SA可以促进高温胁迫下葡萄叶片内ASA和GSH含量的积累,维持较高的APX、GR、SOD、POD和CAT活性。外源SA可能通过提高高温胁迫下葡萄体内抗氧化水平,削弱了高温胁迫对葡萄植株的氧化胁迫伤害作用。     

Inhibition of Root Growth and Polyamine Metabolism in Sunflower (Helianthus annuus) Seedlings Under Cadmium and Copper Stress

Although sunflower is usually regarded as a highly tolerant crop, impairment of root growth at initial stages of plant development may result in poor crop establishment and higher susceptibility to pathogen attack. In order to evaluate if Cd2+ and Cu2+ may impact on sunflower germination and initial root development, a pot experiment under controlled conditions was carried out. Possible involvement of polyamine metabolism in sunflower response to these stressors was also investigated. Although Cd2+ and Cu2+ treatments affect neither seed germination nor radical emergence, sunflower seedlings grown in the presence of these heavy metals showed significant inhibition of root growth, being this inhibition greater for Cd2+. Both metals caused significant increases in proline contents at the highest concentrations tested (0.5 and 1 mM), and these increments were more pronounced for Cd2+ treatments, especially between days 3 and 10. Metals also increased putrescine (Put) contents at all concentrations assayed from the seventh day onward, causing no variations on this polyamine time-course pattern. Spermine and spermidine contents, however, were increased only by 1 mM Cd2+. Arginine decarboxylase seems to have been the enzyme responsible for Put increases under both metal treatments. This work demonstrates that initial root growth of sunflower seedlings may be significantly impaired in Cd2+ or Cu2+ contaminated soils. It also shows that polyamines are key biological compounds, which are probably involved in signaling pathways triggered under stress environmental conditions.     

外源甘草酸对NaCl胁迫条件下甘草幼苗生长、根部甘草酸含量以及几种与盐胁迫相关生理指标的影响

50和100mmol·L-1NaCl有利于甘草幼苗根部甘草酸积累。在200mmol·L-1NaCl胁迫下喷施甘草酸(5mmol·L-1),可以明显促进根的生长,提高叶片中叶绿素含量和叶绿素荧光参数Fv/Fm,降低叶片电导率、可溶性糖和脯氨酸含量,增加根部甘草酸含量。