植物色素 B 与 LIGULELESS1 相互作用,控制玉米的植株结构和耐密度。

IF 17.1 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecular Plant Pub Date : 2024-08-05 Epub Date: 2024-06-29 DOI:10.1016/j.molp.2024.06.014
Qingbiao Shi, Ying Xia, Qibin Wang, Kaiwen Lv, Hengjia Yang, Lianzhe Cui, Yue Sun, Xiaofei Wang, Qing Tao, Xiehai Song, Di Xu, Wenchang Xu, Xingyun Wang, Xianglan Wang, Fanying Kong, Haisen Zhang, Bosheng Li, Pinghua Li, Haiyang Wang, Gang Li
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引用次数: 0

摘要

过去几十年来,玉米产量的显著提高主要归功于直立型杂交品种植株密度的增加,而不是单株产量的提高。然而,密植会引发避阴反应(SAR),从而优化光吸收,但会损害植株活力和表现,从而限制通过增加植株密度来提高产量。在这项研究中,我们证明了高密度诱导的叶片角度变窄和茎秆/茎杆伸长在很大程度上依赖于phytochrome B(phyB1/B2),phyB1/B2是玉米中负责感知红光(R)和远红光(FR)的主要光感受器。玉米 phyB 与叶片角度的经典关键调控因子 LIGULELESS1(LG1)发生物理相互作用,从而协调调控植物结构和密度耐受性。在高R:FR光照(低密度)条件下,phyB会显著增加LG1的丰度,但在低R:FR光照(高密度)条件下,LG1的丰度会迅速降低,这与不同密度条件下叶片角度和植株高度的变化相关。此外,我们还发现同源转录因子 HB53 是被 phyB 和 LG1 共同抑制的靶标,但在冠层遮荫下会被迅速诱导,这表明它在对不同密度的响应中起着核心作用。值得注意的是,HB53 通过控制韧皮部正面和背面细胞的伸长和分裂来调节植物结构。这些发现揭示了phyB-LG1-HB53调控模块是调控植物结构和密度耐受性的关键分子机制,为培育优化高密度种植的玉米杂交品种提供了潜在的遗传目标。
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Phytochrome B interacts with LIGULELESS1 to control plant architecture and density tolerance in maize.

Over the past few decades, significant improvements in maize yield have been largely attributed to increased plant density of upright hybrid varieties rather than increased yield per plant. However, dense planting triggers shade avoidance responses (SARs) that optimize light absorption but impair plant vigor and performance, limiting yield improvement through increasing plant density. In this study, we demonstrated that high-density-induced leaf angle narrowing and stem/stalk elongation are largely dependent on phytochrome B (phyB1/B2), the primary photoreceptor responsible for perceiving red (R) and far-red (FR) light in maize. We found that maize phyB physically interacts with the LIGULELESS1 (LG1), a classical key regulator of leaf angle, to coordinately regulate plant architecture and density tolerance. The abundance of LG1 is significantly increased by phyB under high R:FR light (low density) but rapidly decreases under low R:FR light (high density), correlating with variations in leaf angle and plant height under various densities. In addition, we identified the homeobox transcription factor HB53 as a target co-repressed by both phyB and LG1 but rapidly induced by canopy shade. Genetic and cellular analyses showed that HB53 regulates plant architecture by controlling the elongation and division of ligular adaxial and abaxial cells. Taken together, these findings uncover the phyB-LG1-HB53 regulatory module as a key molecular mechanism governing plant architecture and density tolerance, providing potential genetic targets for breeding maize hybrid varieties suitable for high-density planting.

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来源期刊
Molecular Plant
Molecular Plant 植物科学-生化与分子生物学
CiteScore
37.60
自引率
2.20%
发文量
1784
审稿时长
1 months
期刊介绍: Molecular Plant is dedicated to serving the plant science community by publishing novel and exciting findings with high significance in plant biology. The journal focuses broadly on cellular biology, physiology, biochemistry, molecular biology, genetics, development, plant-microbe interaction, genomics, bioinformatics, and molecular evolution. Molecular Plant publishes original research articles, reviews, Correspondence, and Spotlights on the most important developments in plant biology.
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