MYB96对种子休眠与萌发过程的协调作用
Coordination of seed dormancy and germination processes by MYB96.
作者信息
Lee Kyounghee, Seo Pil Joon
机构信息
a Department of Bioactive Material Sciences and Research Center of Bioactive Materials ; Chonbuk National University ; Jeonju , Korea.
b Department of Chemistry and Research Institute of Physics and Chemistry ; Chonbuk National University ; Jeonju , Korea.
出版信息
Plant Signal Behav. 2015;10(9):e1056423. doi: 10.1080/15592324.2015.1056423.
Abstract
The transition between seed dormancy and germination is an important stage that initiates plant life cycle. Hormonal balances of abscisic acid (ABA) and gibberellin (GA) contribute to determining the proper timing to germinate. Here, we demonstrate that the R2R3-type MYB96 transcription factor, a key ABA signaling mediator, coordinates seed dormancy and germination processes through distinct downstream events. This transcription factor controls ABA-INSENSITIVE 4 (ABI4) expression to inhibit seed germination by suppressing breakdown of lipid reserves in embryo. In addition, it also induces seed dormancy by stimulating ABA biosynthesis in an ABI4-independent manner. We propose that MYB96 integrates a multitude of environmental stress signals and acts as a master regulator in the determination of timing for seed germination.
摘要
种子休眠与萌发之间的转变是启动植物生命周期的一个重要阶段。脱落酸（ABA）和赤霉素（GA）的激素平衡有助于确定种子萌发的适宜时间。在此，我们证明R2R3型MYB96转录因子作为ABA信号传导的关键调节因子，通过不同的下游事件协调种子休眠和萌发过程。该转录因子通过抑制胚胎中脂质储备的分解来控制ABA不敏感4（ABI4）的表达，从而抑制种子萌发。此外，它还以不依赖ABI4的方式刺激ABA生物合成，进而诱导种子休眠。我们认为，MYB96整合了多种环境胁迫信号，并在决定种子萌发时间方面起着主要调节作用。
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本文引用的文献
1
The Arabidopsis MYB96 Transcription Factor Is a Positive Regulator of ABSCISIC ACID-INSENSITIVE4 in the Control of Seed Germination.拟南芥MYB96转录因子是种子萌发调控中脱落酸不敏感4基因的正向调节因子。
Plant Physiol. 2015 Jun;168(2):677-89. doi: 10.1104/pp.15.00162. Epub 2015 Apr 13.
2
The Arabidopsis MYB96 transcription factor plays a role in seed dormancy.拟南芥 MYB96 转录因子在种子休眠中起作用。
Plant Mol Biol. 2015 Mar;87(4-5):371-81. doi: 10.1007/s11103-015-0283-4. Epub 2015 Jan 24.
3
ABI4 regulates primary seed dormancy by regulating the biogenesis of abscisic acid and gibberellins in arabidopsis.ABI4 通过调节脱落酸和赤霉素的生物发生来调控拟南芥的初生种子休眠。
PLoS Genet. 2013 Jun;9(6):e1003577. doi: 10.1371/journal.pgen.1003577. Epub 2013 Jun 20.
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Seed storage oil mobilization is important but not essential for germination or seedling establishment in Arabidopsis.种子贮藏油的动员对拟南芥的萌发或幼苗建立很重要，但不是必需的。
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