Photosynthetic characteristics and genetic mapping of a new yellow leaf mutant crm1 in Brassica napus

文献类型： 外文期刊

第一作者： Zhang, Hui

作者： Zhang, Hui;Xiang, Fujiang;Zhang, Zhengfeng;Duan, Feifei;Zhou, Quanyu;Li, Xin;Li, Xinmei;Zhao, Xiaoying;Zhang, Hui;Guo, Yiming;Li, Bao;Zhang, Wei;Chen, Tingzhou;Fang, Miaoquan

作者机构：

关键词： Photosynthetic characteristics; Chlorophyll synthesis; CHLI; Yellow leaf mutant; crm1; Brassica napus

期刊名称：MOLECULAR BREEDING （ 影响因子：3.1； 五年影响因子：3.1 ）

ISSN： 1380-3743

年卷期： 2023 年 43 卷 11 期

页码：

收录情况： SCI

摘要： Chlorophyll is one of the key factors for photosynthesis and plays an important role in plant growth and development. We previously isolated an EMS mutagenized rapeseed chlorophyll-reduced mutant (crm1), which had yellow leaf, reduced chlorophyll content and fewer thylakoid stacks. Here, we found that crm1 showed attenuated utilization efficiency of both light energy and CO2 but enhanced heat dissipation efficiency and greater tolerance to high-light intensity. BSA-Seq analysis identified a single nucleotide change (C to T) and (G to A) in the third exon of the BnaA01G0094500ZS and BnaC01G0116100ZS, respectively. These two genes encode the magnesium chelatase subunit I 1 (CHLI1) that catalyzes the insertion of magnesium into protoporphyrin IX, a pivotal step in chlorophyll synthesis. The mutation sites resulted in an amino acid substitution P144S and G128E within the AAA+ domain of the CHLI1 protein. Two KASP markers were developed and co-segregated with the yellow leaf phenotype in segregating F2 population. Loss of BnaA01.CHLI1 and BnaC01.CHLI1 by CRISPR/Cas9 gene editing recapitulated the mutant phenotype. BnaA01.CHLI1 and BnaC01.CHLI1 were located in chloroplast and highly expressed in the leaves. Furthermore, RNA-seq analyses revealed the expression of chlorophyll synthesis-related genes were upregulated in the crm1 mutant. These findings provide a new insight into the regulatory mechanism of chlorophyll synthesis in rapeseed and suggest a novel target for improving the photosynthetic efficiency and tolerance to high-light intensity in crops.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序