共 52 条
Uncoupling brassinosteroid levels and de-etiolation in pea
被引:37
作者:

Symons, GM
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h-index: 0
机构:
Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

Schultz, L
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Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

Kerckhoffs, LHJ
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Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

Davies, NW
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h-index: 0
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Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

Gregory, D
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Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia

Reid, JB
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h-index: 0
机构:
Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia
机构:
[1] Univ Tasmania, Sch Plant Sci, Hobart, Tas 7001, Australia
关键词:
D O I:
10.1034/j.1399-3054.2002.1150219.x
中图分类号:
Q94 [植物学];
学科分类号:
071001 ;
摘要:
The suggestion that brassinosteroids (BRs) have a negative regulatory role in de-etiolation is based largely on correlative evidence, which includes the de-etiolated phenotypes of and increased expression of light-regulated genes in, dark-grown mutants defective in BR biosynthesis or response. However, we have obtained the first direct evidence which shows that endogenous BR levels in light-grown pea seedlings are increased, not decreased, in comparison with those grown in the dark. Similarly, we found no evidence of a decrease in castasterone (CS) levels in seedlings that were transferred from the dark to the light for 24 h. Furthermore, CS levels in the constitutively de-etiolated lip1 mutant are similar to those in wild-type plants, and are not reduced as is the case in the BR-deficient 10 plants. Unlike lip1, the pea BR-deficient mutants lk and lkb are not de-etiolated at the morphological or molecular level, as they exhibit neither a de-etiolated phenotype or altered expression of light-regulated genes when grown in the dark. Similarly, dark-grown WT plants treated with the BR biosynthesis inhibitor, Brz, do not exhibit a de-etiolated phenotype. In addition, analysis of the lip1lkb double mutant revealed an additive phenotype indicative of the two genes acting in independent pathways. Together these results strongly suggest that BR levels do not play a negative-regulatory role in de-etiolation in pea.
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页码:311 / 319
页数:9
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