Molecular mechanism of internode elongation in rice.

IF 2 4区 农林科学 Q2 AGRONOMY Breeding Science Pub Date : 2023-04-01 DOI:10.1270/jsbbs.22086
Keisuke Nagai, Motoyuki Ashikari
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引用次数: 2

Abstract

Rice plants that form ventilated tissues, such as aerenchyma in the leaves, stems, and roots, allow for growth in waterlogged conditions (paddy fields), but they cannot breathe and drown in flooded environments where the whole plant body is submerged. However, deepwater rice plants grown in flood-prone areas of Southeast Asia survive in prolonged flooded environments by taking in air through an elongated stem (internode) and leaves that emerge above the water surface, even if the water level is several meters high and flooding continues for several months. Although it has been known that plant hormones, such as ethylene and gibberellins, promote internode elongation in deepwater rice plants, the genes that control rapid internode elongation during submergence have not been identified. We recently identified several genes responsible for the quantitative trait loci involved in internode elongation in deepwater rice. Identification of the the genes revealed a molecular gene network from ethylene to gibberellins in which internode elongation is promoted by novel ethylene-responsive factors and enhances gibberellin responsiveness at the internode. In addition, elucidation of the molecular mechanism of internode elongation in deepwater rice will help our understanding of the internode elongation mechanism in normal paddy rice and contribute to improving crops through the regulation of internode elongation.

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水稻节间伸长的分子机制。
水稻植株形成通气组织,如叶片、茎和根中的通气组织,可以在水田条件下生长,但它们不能呼吸,在整个植物体被淹没的水淹环境中淹死。然而,生长在东南亚洪水易发地区的深水水稻,即使水位达到几米高,洪水持续数月,也能通过细长的茎(节间)和露出水面的叶子吸收空气,在长时间的洪水环境中存活下来。虽然已知植物激素,如乙烯和赤霉素,促进深水水稻的节间伸长,但尚未确定在淹没期间控制节间快速伸长的基因。我们最近发现了几个与深水水稻节间伸长数量性状位点有关的基因。这些基因的鉴定揭示了一个从乙烯到赤霉素的分子基因网络,在这个网络中,新的乙烯响应因子促进了节间伸长,增强了赤霉素在节间的响应性。此外,阐明深水水稻节间伸长的分子机制将有助于我们理解正常水稻的节间伸长机制,并有助于通过调控节间伸长来改良作物。
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来源期刊
Breeding Science
Breeding Science 农林科学-农艺学
CiteScore
4.90
自引率
4.20%
发文量
37
审稿时长
1.5 months
期刊介绍: Breeding Science is published by the Japanese Society of Breeding. Breeding Science publishes research papers, notes and reviews related to breeding. Research Papers are standard original articles. Notes report new cultivars, breeding lines, germplasms, genetic stocks, mapping populations, database, software, and techniques significant and useful for breeding. Reviews summarize recent and historical events related breeding. Manuscripts should be submitted by corresponding author. Corresponding author must have obtained permission from all authors prior to submission. Correspondence, proofs, and charges of excess page and color figures should be handled by the corresponding author.
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