共查询到20条相似文献,搜索用时 31 毫秒
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Peng Gao Xi Bai Liang Yang Dekang Lv Xin Pan Yong Li Hua Cai Wei Ji Qin Chen Yanming Zhu 《Molecular biology reports》2011,38(1):237-242
Salinity and alkalinity are the two main environmental factors that limit rice production. Better understanding of the mechanisms
responsible for salinity and alkaline stress tolerance would allow researchers to modify rice to increase its resistance to
salinity and alkaline stress. MicroRNAs (miRNAs) are ~21-nucleotide RNAs that are ubiquitous regulators of gene expression
in eukaryotic organisms. Some miRNAs acts as an important endogenous regulator in plant responses to abiotic stressors. miR393
is a conservative miRNA family that occurs in a variety of different plants. The two members of the miR393 family found in
rice are named osa-MIR393 and osa-MIR393b. We found that the osa-MIR393 expression level changed under salinity and alkaline stress, whereas that of osa-MIR393b did not. Target genes of osa-MIR393 were predicted, and some of these putative targets are abiotic related genes. Furthermore, we generated transgenic rice and
Arabidopsis thaliana that over-expressed osa-MIR393, and the phenotype analysis showed that these transgenic plants were more sensitive to salt and alkali treatment compared
to wild-type plants. These results illustrate that over-expression of osa-MIR393 can negatively regulate rice salt-alkali stress tolerance. 相似文献
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Yang Sun Wei Xu Yuebin Jia Mengcheng Wang Guangmin Xia 《The Plant journal : for cell and molecular biology》2015,84(6):1219-1230
Light and abiotic stress both strongly modulate plant growth and development. However, the effect of light‐responsive factors on growth and abiotic stress responses in wheat (Triticum aestivum) is unknown. G–box binding factors (GBFs) are blue light‐specific components, but their function in abiotic stress responses has not been studied. Here we identified a wheat GBF1 gene that mediated both the blue light‐ and abiotic stress‐responsive signaling pathways. TaGBF1 was inducible by blue light, salt and exposure to abscisic acid (ABA). TaGBF1 interacted with a G–box light‐responsive element in vitro and promoted a blue‐light response in wheat and Aradidopsis thaliana. Both TaGBF1 over‐expression in wheat and its heterologous expression in A. thaliana heighten sensitivity to salinity and ABA, but its knockdown in wheat conferred resistance to high salinity and ABA. The expression of AtABI5, a key component of the ABA signaling pathway in A. thaliana, and its homolog Wabi5 in wheat was increased by transgenic expression of TaGBF1. The hypersensitivity to salt and ABA caused by TaGBF1 was not observed in the abi5 mutant background, showing that ABI5 is the mediator in TaGBF1‐induced abiotic stress responses. However, the hypersensitivity to salt conferred by TaGBF1 is not dependent on light. This suggests that TaGBF1 is a common component of blue light‐ and abiotic stress‐responsive signaling pathways. 相似文献
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The Alfin‐like homeodomain finger protein AL5 suppresses multiple negative factors to confer abiotic stress tolerance in Arabidopsis
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Wei Wei Yu‐Qin Zhang Jian‐Jun Tao Hao‐Wei Chen Qing‐Tian Li Wan‐Ke Zhang Biao Ma Qing Lin Jin‐Song Zhang Shou‐Yi Chen 《The Plant journal : for cell and molecular biology》2015,81(6):871-883
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Since plants cannot move to avoid stress, they have sophisticated acclimation mechanisms against a variety of abiotic stresses.
The phytohormone abscisic acid (ABA) plays essential roles in abiotic stress tolerances in land plants. Therefore, it is interesting
to address the evolutionary origins of ABA metabolism and its signaling pathways in land plants. Here, we focused on 48 ABA-related
Arabidopsis thaliana genes with 11 protein functions, and generated 11 orthologous clusters of ABA-related genes from A. thaliana, Arabidopsis lyrata, Populus trichocarpa, Oryza sativa, Selaginella moellendorffii, and Physcomitrella patens. Phylogenetic analyses suggested that the common ancestor of these six species possessed most of the key protein functions
of ABA-related genes. In two species (A. thaliana and O. sativa), duplicate genes related to ABA signaling pathways contribute to the expression variation in different organs or stress
responses. In particular, there is significant expansion of gene families related to ABA in evolutionary periods associated
with morphological divergence. Taken together, these results suggest that expansion of the gene families related to ABA signaling
pathways may have contributed to the sophisticated stress tolerance mechanisms of higher land plants. 相似文献
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Background
Recent reports suggest that vitamin B1 (thiamine) participates in the processes underlying plant adaptations to certain types of abiotic and biotic stress, mainly oxidative stress. Most of the genes coding for enzymes involved in thiamine biosynthesis in Arabidopsis thaliana have been identified. In our present study, we examined the expression of thiamine biosynthetic genes, of genes encoding thiamine diphosphate-dependent enzymes and the levels of thiamine compounds during the early (sensing) and late (adaptation) responses of Arabidopsis seedlings to oxidative, salinity and osmotic stress. The possible roles of plant hormones in the regulation of the thiamine contribution to stress responses were also explored. 相似文献11.
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Joint genetic and network analyses identify loci associated with root growth under NaCl stress in Arabidopsis thaliana 总被引:1,自引:0,他引:1
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Yuriko Kobayashi Ayan Sadhukhan Tanveer Tazib Yuki Nakano Kazutaka Kusunoki Mohamed Kamara Radhouane Chaffai Satoshi Iuchi Lingaraj Sahoo Masatomo Kobayashi Owen A. Hoekenga Hiroyuki Koyama 《Plant, cell & environment》2016,39(4):918-934
Plants have evolved a series of tolerance mechanisms to saline stress, which perturbs physiological processes throughout the plant. To identify genetic mechanisms associated with salinity tolerance, we performed linkage analysis and genome‐wide association study (GWAS) on maintenance of root growth of Arabidopsis thaliana in hydroponic culture with weak and severe NaCl toxicity. The top 200 single‐nucleotide polymorphisms (SNPs) determined by GWAS could cumulatively explain approximately 70% of the variation observed at each stress level. The most significant SNPs were linked to the genes of ATP‐binding cassette B10 and vacuolar proton ATPase A2. Several known salinity tolerance genes such as potassium channel KAT1 and calcium sensor SOS3 were also linked to SNPs in the top 200. In parallel, we constructed a gene co‐expression network to independently verify that particular groups of genes work together to a common purpose. We identify molecular mechanisms to confer salt tolerance from both predictable and novel physiological sources and validate the utility of combined genetic and network analysis. Additionally, our study indicates that the genetic architecture of salt tolerance is responsive to the severity of stress. These gene datasets are a significant information resource for a following exploration of gene function. 相似文献
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Drought and Salt Tolerance in Plants 总被引:8,自引:0,他引:8
Agricultural productivity worldwide is subject to increasing environmental constraints, particularly to drought and salinity due to their high magnitude of impact and wide distribution. Traditional breeding programs trying to improve abiotic stress tolerance have had some success, but are limited by the multigenic nature of the trait. Tolerant plants such as Craterostigma plantagenium, Mesembryanthemum crystallinum, Thellungiella halophila and other hardy plants could be valuable tools to dissect the extreme tolerance nature. In the last decade, Arabidopsis thaliana, a genetic model plant, has been extensively used for unravelling the molecular basis of stress tolerance. Arabidopsis also proved to be extremely important for assessing functions for individual stress-associated genes due to the availability of knock-out mutants and its amenability for genetic transformation. In this review, the responses of plants to salt and water stress are described, the regulatory circuits which allow plants to cope with stress are presented, and how the present knowledge can be applied to obtain tolerant plants is discussed. 相似文献
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