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Brassinosteroids (BRs) are plant steroid hormones that play essential roles in growth and development. Mutations in BR-signaling pathways cause defective in growth and development like dwarfism, male sterility, abnormal vascular development and photomorphogenesis. Transition from vegetative to reproductive growth is a critical phase change in the development of a flowering plant. In a screen of activation-tagged Arabidopsis, we identified a mutant named abz126 that displayed longer hypocotyls when grown in the dark on MS media containing brassinazole (Brz), an inhibitor of BRs biosynthesis. We have cloned the mutant locus using adapter ligation PCR walking and identified that a single T-DNA had been integrated into the ninth exon of the GIGANTEA (GI) gene, involved in controling flowering time. This insertion resulted in loss-of-function of the GI gene and caused the following phenotypes: long petioles, tall plant height, many rosette leaves and late flowering. RT-PCR assays on abz126 mutant showed that the T-DNA insertion in GIGANTEA led to the loss of mRNA expression of the GI gene. In the hormone dose response assay, abz126 mutant showed: 1) an insensitivity to paclobutrazole (PAC), 2) an altered response with 6-benzylaminopurine (BAP) and 3) insensitive to Brassinolide (BL). Based on these results, we propose that the late flowering and tall phenotypes displayed by the abz126 mutant are caused by a loss-of-function of the GI gene associated with brassinosteroid hormone signaling.

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참고문헌 (31건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
1 Molecular physiology of brassinosteroids revealed by the analysis of mutants 네이버 미소장
2 Characterization of gravitropic inflorescence bending in brassinosteroid biosynthesis and signaling Arabidopsis mutants 네이버 미소장
3 Selective interaction of triazole derivatives with DWF4, a cytochrome P450 monooxygenase of the brassinosteroid biosynthetic pathway, correlates with brassinosteroid deficiency in planta. 네이버 미소장
4 Brassinosteroids and Plant Steroid Hormone Signaling 네이버 미소장
5 Involvement of GIGANTEA gene in the regulation of the cold stress response in Arabidopsis 네이버 미소장
6 A Brassinosteroid-Insensitive Mutant in Arabidopsis thaliana Exhibits Multiple Defects in Growth and Development 네이버 미소장
7 The circadian oscillator gene GIGANTEA mediates a long-term response of the Arabidopsis thaliana circadian clock to sucrose. 네이버 미소장
8 Chemical Inhibition of a Subset of Arabidopsis thaliana GSK3-like Kinases Activates Brassinosteroid Signaling 네이버 미소장
9 GIGANTEA: a circadian clock-controlled gene that regulates photoperiodic flowering in Arabidopsis and encodes a protein with several possible membrane-spanning domains. 네이버 미소장
10 Arabidopsis Transcriptome Profiling Indicates That Multiple Regulatory Pathways Are Activated during Cold Acclimation in Addition to the CBF Cold Response Pathway 네이버 미소장
11 Brassinosteroid-Insensitive-1 Is a Ubiquitously Expressed Leucine-Rich Repeat Receptor Serine/Threonine Kinase 네이버 미소장
12 Perception of Brassinosteroids by the Extracellular Domain of the Receptor Kinase BRI1 네이버 미소장
13 GIGANTEA Is a Nuclear Protein Involved in Phytochrome Signaling in Arabidopsis 네이버 미소장
14 R. Karlova and S. C. de Vries, “Advances in understanding brassinosteroid signaling”, STKE. Sci., Vol. 2006, No. 354, p. 36, 2006. 미소장
15 Brassinosteroid: Signal Transduction from Receptor Kinases to Transcription Factors 네이버 미소장
16 Oxidative stress tolerance and longevity in Arabidopsis: the late‐flowering mutant gigantea is tolerant to paraquat 네이버 미소장
17 A Putative Leucine-Rich Repeat Receptor Kinase Involved in Brassinosteroid Signal Transduction 네이버 미소장
18 Regulation of Brassinosteroid Signaling by a GSK3/SHAGGY-like Kinase 네이버 미소장
19 Nuclear protein phosphatases with Kelch-repeat domains modulate the response to brassinosteroids in Arabidopsis. 네이버 미소장
20 Tyrosine phosphorylation in brassinosteroid signaling. 네이버 미소장
21 GIGANTEA Regulates Phytochrome A-Mediated Photomorphogenesis Independently of Its Role in the Circadian Clock 네이버 미소장
22 Control of Circadian Rhythms and Photoperiodic Flowering by the Arabidopsis GIGANTEA Gene 네이버 미소장
23 Phosphorylation dependent nucleocytoplasmic shuttling of BES1 is a key regulatory event in brassinosteroid signaling 소장
24 Brassinosteroid signal transduction: still casting the actors 네이버 미소장
25 Brz220 Interacts with DWF4, a Cytochrome P450 Monooxygenase in Brassinosteroid Biosynthesis, and Exerts Biological Activity 네이버 미소장
26 shk1‐D, a dwarf Arabidopsis mutant caused by activation of the CYP72C1 gene, has altered brassinosteroid levels 네이버 미소장
27 Autoregulation and Homodimerization Are Involved in the Activation of the Plant Steroid Receptor BRI1 네이버 미소장
28 Nuclear-Localized BZR1 Mediates Brassinosteroid-Induced Growth and Feedback Suppression of Brassinosteroid Biosynthesis 네이버 미소장
29 BRI1 is a critical component of a plasma-membrane receptor for plant steroids. 네이버 미소장
30 Activation Tagging in Arabidopsis 네이버 미소장
31 BES1 Accumulates in the Nucleus in Response to Brassinosteroids to Regulate Gene Expression and Promote Stem Elongation 네이버 미소장

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