Phytochrome B interacts with LIGULELESS1 to control plant architecture and density tolerance in maize

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外文摘要：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 demon-strated 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 abun-dance 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.

外文关键词：

maizephytochrome BLIGULELESS1HB53leaf angledensity tolerance

作者：

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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作者单位：

State Key Laboratory of Wheat Improvement,College of Life Sciences,Shandong Agricultural University,Tai'an 271018,China

State Key Laboratory of Wheat Improvement,College of Agronomy,Shandong Agricultural University,Tai'an 271018,China

Peking University Institute of Advanced Agricultural Sciences,Shandong Laboratory of Advanced Agricultural Sciences at Weifang,Weifang,Shandong 261000,China

Guandong Laboratory for Lingnan Modern Agriculture,State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,South China Agricultural University,Guangzhou 510642,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShandong Provincial Natural Science FoundationShandong Provincial Natural Science FoundationShandong Provincial Natural Science Foundation

项目编号：

322702633213007732272140ZR2022QC095ZR2020MC023ZR2022MC019

出版年：

2024

DOI：

10.1016/j.molp.2024.06.014

分子植物(英文版)

中科院上海生命科学研究院植物生理生态所　中国植物生理学会

分子植物(英文版)

CSTPCD

影响因子：0.659

ISSN：1674-2052

年,卷(期)：2024.17(8)