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11.
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
12.
Structure and function of abscisic acid receptors 总被引:2,自引:0,他引:2
13.
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
14.
15.
Identification of cold-inducible downstream genes of the Arabidopsis DREB1A/CBF3 transcriptional factor using two microarray systems 总被引:20,自引:0,他引:20
16.
17.
Regulation of drought tolerance by gene manipulation of 9-cis-epoxycarotenoid dioxygenase, a key enzyme in abscisic acid biosynthesis in Arabidopsis 总被引:24,自引:0,他引:24
18.
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
19.
We have so far cloned a cDNA encoding a hybrid-type histidine kinase (ATHK1), three cDNAs encoding phosphorelay intermediates (ATHP1-3), and four cDNAs encoding response regulators (ATRR1-4) from Arabidopsis thaliana. To determine which molecules constitute a His to Asp phosphorelay pathway, we examined protein-protein interactions between them using a pairwise yeast two-hybrid analysis, as an initial step. We detected a specific interaction between ATHK1 and ATHP1. We further examined protein-protein interactions between ATHP1-3 and other histidine kinases. We detected interactions between ETR1 and all ATHPs, and between CKI1 and ATHP1 or ATHP2. Interestingly, ERS1 could not interact with any ATHPs. We also examined protein-protein interactions between ATHP1-3 and ATRR1-4. The results indicated that ATHP2 could interact with ATRR4, and that ATHP3 could interact with ATRR1 or ATRR4. However, ATHP1 could not interact with any ATRRs. On the basis of these results, we discuss the possible phosphorelay networks in an Arabidopsis two-component system. 相似文献
20.
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