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抗坏血酸和活性氧参与脱落酸对水稻种子萌发的抑制。

Ascorbic acid and reactive oxygen species are involved in the inhibition of seed germination by abscisic acid in rice seeds.

机构信息

Department of Biology, Hong Kong Baptist University, Hong Kong, China.

出版信息

J Exp Bot. 2012 Mar;63(5):1809-22. doi: 10.1093/jxb/err336. Epub 2011 Dec 26.

DOI:10.1093/jxb/err336
PMID:22200664
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3295380/
Abstract

The antagonism between abscisic acid (ABA) and gibberellin (GA) plays a key role in controlling seed germination, but the mechanism of antagonism during this process is not known. The possible links among ABA, reactive oxygen species (ROS), ascorbic acid (ASC), and GA during rice seed germination were investigated. Unlike in non-seed tissues where ROS production is increased by ABA, ABA reduced ROS production in imbibed rice seeds, especially in the embryo region. Such reduced ROS also led to an inhibition of ASC production. GA accumulation was also suppressed by a reduced ROS and ASC level, which was indicated by the inhibited expression of GA biosynthesis genes, amylase genes, and enzyme activity. Application of exogenous ASC can partially rescue seed germination from ABA treatment. Production of ASC, which acts as a substrate in GA biosynthesis, was significantly inhibited by lycorine which thus suppressed the accumulation of GA. Consequently, expression of GA biosynthesis genes was suppressed by the low levels of ROS and ASC in ABA-treated seeds. It can be concluded that ABA regulates seed germination in multiple dimensions. ROS and ASC are involved in its inhibition of GA biosynthesis.

摘要

脱落酸（ABA）与赤霉素（GA）之间的拮抗作用在控制种子萌发中起着关键作用，但这一过程中拮抗作用的机制尚不清楚。本研究调查了 ABA、活性氧（ROS）、抗坏血酸（ASC）和 GA 在水稻种子萌发过程中的可能联系。与 ABA 增加非种子组织中 ROS 产生的情况不同，ABA 减少了吸胀水稻种子中的 ROS 产生，特别是在胚胎区域。这种减少的 ROS 也导致 ASC 产生的抑制。ROS 和 ASC 水平的降低也抑制了 GA 积累，这表现为 GA 生物合成基因、淀粉酶基因的表达抑制和酶活性降低。外源 ASC 的应用可以部分挽救种子萌发过程中 ABA 处理的抑制。作为 GA 生物合成中底物的 ASC 的产生受到石蒜碱的显著抑制，从而抑制了 GA 的积累。因此，ABA 处理种子中 ROS 和 ASC 水平较低，抑制了 GA 生物合成基因的表达。可以得出结论，ABA 以多种方式调节种子萌发。ROS 和 ASC 参与了 ABA 对 GA 生物合成的抑制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/8abce4671859/jexboterr336f010_lw.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/2edfce65b28a/jexboterr336f04_3c.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/ac880ef472b6/jexboterr336f05_lw.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/f86a1323356e/jexboterr336f07_lw.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/44090853329f/jexboterr336f09_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/8abce4671859/jexboterr336f010_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/d3e92b85f075/jexboterr336f01_ht.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/b3a7a116d86a/jexboterr336f02_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/e9a532b794f7/jexboterr336f03_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/2edfce65b28a/jexboterr336f04_3c.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/ac880ef472b6/jexboterr336f05_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/8857e0f979f7/jexboterr336f06_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/f86a1323356e/jexboterr336f07_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/8fedef38b525/jexboterr336f08_ht.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/44090853329f/jexboterr336f09_lw.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/615b/3295380/8abce4671859/jexboterr336f010_lw.jpg

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