螯合酶亚基I-A的自然变异增加粒重并提高小麦产量。

Natural variation in CHELATASE SUBUNIT I-A increases grain weight and enhances wheat yield.

作者信息

Wei Bo, Liu Yike, Lyu Mingjie, Chen Rui, Ma Jian, Yin Changbin, Huang Ju, Peng Lixin, Fu Zhen, Song Qilu, Lu Fei, Zhang Xiangqi, Jiao Yuling

机构信息

State Key Laboratory of Wheat Improvement, Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences in Weifang, Weifang, Shandong 261325, China.

Key Laboratory of Crop Molecular Breeding, Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Institute of Food Crops, Hubei Academy of Agricultural Sciences, Wuhan, Hubei 430064, China.

出版信息

Plant Cell. 2025 Sep 9;37(9). doi: 10.1093/plcell/koaf212.

DOI:10.1093/plcell/koaf212

PMID:40884331

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12419692/

Abstract

Grain weight is a major determinant of wheat (Triticum aestivum L.) yield and is controlled by quantitative trait loci (QTLs) derived from natural variations. Here, we report the cloning of a major yield QTL in bread wheat that functions in the chlorophyll biosynthesis pathway. We found that the natural variation of CHELATASE SUBUNIT I-A (CHLI-A), encoding a magnesium chelatase subunit, enhances chlorophyll content and photosynthesis rate, leading to increased leaf area and grain weight. Increasing CHLI-A expression increases grain weight, indicating that photosynthesis is a limiting factor of wheat yield potential. The CHLI-A gene is absent in a portion of elite varieties, suggesting the potential of using this gene to improve grain yield in wheat.

摘要

粒重是小麦（Triticum aestivum L.）产量的主要决定因素，受自然变异衍生的数量性状位点（QTL）控制。在此，我们报告了一个在面包小麦中起作用于叶绿素生物合成途径的主要产量QTL的克隆。我们发现，编码镁螯合酶亚基的CHELATASE SUBUNIT I-A（CHLI-A）的自然变异提高了叶绿素含量和光合速率，导致叶面积和粒重增加。增加CHLI-A的表达可提高粒重，表明光合作用是小麦产量潜力的限制因素。一部分优良品种中不存在CHLI-A基因，这表明利用该基因提高小麦粒重的潜力。