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排序方式: 共有183条查询结果,搜索用时 15 毫秒
1.
Structure and function of abscisic acid receptors 总被引:2,自引:0,他引:2
2.
OsTZF1, a CCCH-Tandem Zinc Finger Protein,Confers Delayed Senescence and Stress Tolerance in Rice by Regulating Stress-Related Genes 总被引:1,自引:0,他引:1
3.
Yuriko Osakabe Naoko Arinaga Taishi Umezawa Shogo Katsura Keita Nagamachi Hidenori Tanaka Haruka Ohiraki Kohji Yamada So-Uk Seo Mitsuru Abo Etsuro Yoshimura Kazuo Shinozaki Kazuko Yamaguchi-Shinozaki 《The Plant cell》2013,25(2):609-624
Osmotic adjustment plays a fundamental role in water stress responses and growth in plants; however, the molecular mechanisms governing this process are not fully understood. Here, we demonstrated that the KUP potassium transporter family plays important roles in this process, under the control of abscisic acid (ABA) and auxin. We generated Arabidopsis thaliana multiple mutants for K+ uptake transporter 6 (KUP6), KUP8, KUP2/SHORT HYPOCOTYL3, and an ABA-responsive potassium efflux channel, guard cell outward rectifying K+ channel (GORK). The triple mutants, kup268 and kup68 gork, exhibited enhanced cell expansion, suggesting that these KUPs negatively regulate turgor-dependent growth. Potassium uptake experiments using 86radioactive rubidium ion (86Rb+) in the mutants indicated that these KUPs might be involved in potassium efflux in Arabidopsis roots. The mutants showed increased auxin responses and decreased sensitivity to an auxin inhibitor (1-N-naphthylphthalamic acid) and ABA in lateral root growth. During water deficit stress, kup68 gork impaired ABA-mediated stomatal closing, and kup268 and kup68 gork decreased survival of drought stress. The protein kinase SNF1-related protein kinases 2E (SRK2E), a key component of ABA signaling, interacted with and phosphorylated KUP6, suggesting that KUP functions are regulated directly via an ABA signaling complex. We propose that the KUP6 subfamily transporters act as key factors in osmotic adjustment by balancing potassium homeostasis in cell growth and drought stress responses. 相似文献
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Receptor-like protein kinase 2 (RPK 2) is a novel factor controlling anther development in Arabidopsis thaliana 总被引:4,自引:0,他引:4
Mizuno S Osakabe Y Maruyama K Ito T Osakabe K Sato T Shinozaki K Yamaguchi-Shinozaki K 《The Plant journal : for cell and molecular biology》2007,50(5):751-766
Receptor-like kinases (RLK) comprise a large gene family within the Arabidopsis genome and play important roles in plant growth and development as well as in hormone and stress responses. Here we report that a leucine-rich repeat receptor-like kinase (LRR-RLK), RECEPTOR-LIKE PROTEIN KINASE2 (RPK2), is a key regulator of anther development in Arabidopsis. Two RPK2 T-DNA insertional mutants (rpk2-1 and rpk2-2) displayed enhanced shoot growth and male sterility due to defects in anther dehiscence and pollen maturation. The rpk2 anthers only developed three cell layers surrounding the male gametophyte: the middle layer was not differentiated from inner secondary parietal cells. Pollen mother cells in rpk2 anthers could undergo meiosis, but subsequent differentiation of microspores was inhibited by tapetum hypertrophy, with most resulting pollen grains exhibiting highly aggregated morphologies. The presence of tetrads and microspores in individual anthers was observed during microspore formation, indicating that the developmental homeostasis of rpk2 anther locules was disrupted. Anther locules were finally crushed without stomium breakage, a phenomenon that was possibly caused by inadequate thickening and lignification of the endothecium. Microarray analyses revealed that many genes encoding metabolic enzymes, including those involved in cell wall metabolism and lignin biosynthesis, were downregulated throughout anther development in rpk2 mutants. RPK2 mRNA was abundant in the tapetum of wild-type anthers during microspore maturation. These results suggest that RPK2 controls tapetal cell fate by triggering subsequent tapetum degradation, and that mutating RPK2 impairs normal pollen maturation and anther dehiscence due to disruption of key metabolic pathways. 相似文献
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Simpson SD Nakashima K Narusaka Y Seki M Shinozaki K Yamaguchi-Shinozaki K 《The Plant journal : for cell and molecular biology》2003,33(2):259-270
Many plant genes have been shown to be induced by water stress and function in stress tolerance. The erd1 gene has been shown to be upregulated in response to both water stress and etiolation. Promoter studies using the erd1 promoter region fused to the luciferase (LUC) reporter gene in Arabidopsis thaliana were performed to identify the putative cis elements involved. Results indicated that the cis elements, responsible for gene expression during dehydration and etiolation, are separately located in two discrete portions of the erd1 promoter. Base substitution analysis showed that a 14-bp region from -599 to -586, and a myc recognition motif from -466 to -461 are necessary for the induction of LUC activity in dehydrated plants. On the other hand, base substitution analysis revealed that both an abscisic acid responsive element (ABRE)-like sequence (from -199 to -195) and an ACGT sequence (from -155 to -152) are required for an etiolation-induced increase in LUC activity. LUC activity measurements from etiolated transgenic plants incubated in either water, N6-benzyleadenine (BA), or a 1% sucrose solution found that while BA was able to delay the increase in LUC activity seen in water-treated plants, no increase in LUC activity was seen in plants incubated in sucrose. These results indicate that the erd1 promoter contains two different regulatory systems that are involved in upregulation by dehydration stress and dark-induced senescence. 相似文献
9.
Mikami K Iuchi S Yamaguchi-Shinozaki K Shinozaki K 《Journal of experimental botany》2000,51(343):317-318
A full-length cDNA encoding a novel type of plant dynamin-like protein, ADL3, was isolated from Arabidopsis thaliana. ADL3 is a high molecular weight GTPase whose GTP-binding domain shows a low homology to those of other plant dynamin-like proteins. ADL3 contains the pleckstrin homology domain as is in mammalian dynamins, although other plant dynamin-like proteins reported lack this domain. The ADL3 gene was expressed weakly in various tissues, except for siliques with high level expression, which is distinct from the case for other plant dynamin-like protein genes. Taken together, it is predicted that the mode of activation of ADL3 is different from those of other plant homologues. 相似文献
10.
Mikami K; Takahashi S; Katagiri T; Yamaguchi-Shinozaki K; Shinozaki K 《Journal of experimental botany》1999,50(334):729-730
Screening of an Arabidopsis cDNA library allowed the
isolation of a cDNA encoding a pleckstrin homology (PH) domain protein,
AtPH1, which consists of one PH domain with a short N-terminal extension.
According to its structural features, AtPH1 is proposed to be a plant
homologue of human pleckstrin. Northern blot analysis indicated that the
AtPH1 gene was expressed constitutively in all tissues
examined, with variation in the levels. The presence of a plant pleckstrin
homologue offers new insights into the biological function of the PH domain
in plant signalling. 相似文献