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Multi-omics analysis reveals the pivotal role of phytohormone homeostasis in regulating maize grain water content

文献类型： 外文期刊

作者： Liu, Yuanliang 1 ; Li, Manman 1 ; Liu, Jianju 1 ; Deng, Suining 1 ; Zhang, Yan 3 ; Xia, Yuanfeng 4 ; Liu, Baoshen 2 ; Xu, Mingliang 1 ;

作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Natl Maize Improvement Ctr, Ctr Crop Funct Genom & Mol Breeding,State Key Lab, Beijing 100193, Peoples R China

2.Shandong Agr Univ, Coll Agron, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China

3.Jilin Acad Agr Sci, Inst Agr Biotechnol, Gongzhuling 136100, Jilin, Peoples R China

4.Jilin Acad Agr Sci, Maize Res Inst, Gongzhuling 136100, Jilin, Peoples R China

关键词： Grain water content; Maize kernel; Phytohormone homeostasis

期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）

ISSN： 2095-5421

年卷期： 2024 年 12 卷 4 期

页码：

收录情况： SCI

摘要： Grain water content (GWC) is a key determinant for mechanical harvesting of maize (Zea mays). In our previous research, we identified a quantitative trait locus, qGWC1, associated with GWC in maize. Here, we examined near-isogenic lines (NILs) NILL and NILH that differed at the qGWC1 locus. Lower GWC in NILL was primarily attributed to reduced grain water weight (GWW) and smaller fresh grain size, rather than the accumulation of dry matter. The difference in GWC between the NILs became more pronounced approximately 35 d after pollination (DAP), arising from a faster dehydration rate in NILL. Through an integrated analysis of the transcriptome, proteome, and metabolome, coupled with an examination of hormones and their derivatives, we detected a marked decrease in JA, along with an increase in cytokinin, storage forms of IAA (IAA-Glu, IAA-ASP), and IAA precursor IPA in immature NILL kernels. During kernel development, genes associated with sucrose synthases, starch biosynthesis, and zein production in NILL, exhibited an initial up-regulation followed by a gradual down-regulation, compared to those in NILH. This discovery highlights the crucial role of phytohormone homeostasis and genes related to kernel development in balancing GWC and dry matter accumulation in maize kernels. (c) 2024 Crop Science Society of China and Institute of Crop Science, CAAS?. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC- ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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