期刊
PLANT PHYSIOLOGY
卷 122, 期 4, 页码 1081-1088出版社
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.122.4.1081
关键词
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资金
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004162, BBS/E/C/00004161] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004161, BBS/E/C/00004162] Funding Source: researchfish
Abscisic acid (ABA) is required for the regulation of seed maturation in maize (Zea mays L.). Mutants blocked in ABA synthesis (such as viviparous-5) do not mature to quiescent, desiccation-tolerant seeds, but germinate on the ear midway through kernel development. Because gibberellins (GA) and ABA act antagonistically in many aspects of plant development, we hypothesized that ABA antagonizes a positive GA signal for precocious germination in maize. In these experiments, we show that a CA deficiency early in seed development, induced genetically or via biosynthesis inhibitors, suppresses vivipary in ABA-deficient developing kernels. The resulting seeds have both desiccation tolerance and storage longevity. Temporal analysis of CA accumulation in wild-type kernels revealed the accumulation of bioactive GA(1) and GA(3) prior to the peak in ABA content. We speculate that these GAs stimulate a developmental program leading to vivipary in the absence of normal amounts of ABA, and that a reduction of GA content reestablishes an ABA/GA ratio appropriate for suppression of germination and induction of maturation. In contrast the induction of a GA deficiency did not suppress vivipary in viviparous-l mutant kernels, suggesting that VP1 acts downstream of both GA and ABA in programming seed development.
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