Maize smart-canopy architecture enhances yield at high densities

文献类型： 外文期刊

第一作者： Tian, Jinge

作者： Tian, Jinge;Wang, Chenglong;Chen, Fengyi;Qin, Wenchao;Yang, Hong;Xia, Jinliang;Du, Xian;Zhu, Yifan;Wu, Lishuan;Tian, Feng;Tian, Jinge;Zhao, Sihang;Tian, Feng;Cao, Yan;Li, Hong;Zhuang, Junhong;Li, Jigang;Chen, Shaojiang;Zhang, Huayuan;Deng, Dezhi;Chen, Qiuyue;Zhang, Mingcai;Deng, Xing Wang

作者机构：

期刊名称：NATURE （ 影响因子：50.5； 五年影响因子：54.4 ）

ISSN： 0028-0836

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Increasing planting density is a key strategy for enhancing maize yields1-3. An ideotype for dense planting requires a 'smart canopy' with leaf angles at different canopy layers differentially optimized to maximize light interception and photosynthesis4-6, among other features. Here we identified leaf angle architecture of smart canopy 1 (lac1), a natural mutant with upright upper leaves, less erect middle leaves and relatively flat lower leaves. lac1 has improved photosynthetic capacity and attenuated responses to shade under dense planting. lac1 encodes a brassinosteroid C-22 hydroxylase that predominantly regulates upper leaf angle. Phytochrome A photoreceptors accumulate in shade and interact with the transcription factor RAVL1 to promote its degradation via the 26S proteasome, thereby inhibiting activation of lac1 by RAVL1 and decreasing brassinosteroid levels. This ultimately decreases upper leaf angle in dense fields. Large-scale field trials demonstrate that lac1 boosts maize yields under high planting densities. To quickly introduce lac1 into breeding germplasm, we transformed a haploid inducer and recovered homozygous lac1 edits from 20 diverse inbred lines. The tested doubled haploids uniformly acquired smart-canopy-like plant architecture. We provide an important target and an accelerated strategy for developing high-density-tolerant cultivars, with lac1 serving as a genetic chassis for further engineering of a smart canopy in maize. A natural mutant of maize exhibits leaf characteristics in line with the 'smart canopy' ideotype for high-density planting and boosts yields in large-scale field trials.

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