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

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

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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 pro-nounced 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 exam-ination 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 pro-duction 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.

Grain water contentMaize kernelPhytohormone homeostasis

Yuanliang Liu、Manman Li、Jianju Liu、Suining Deng、Yan Zhang、Yuanfeng Xia、Baoshen Liu、Mingliang Xu

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State Key Laboratory of Plant Environmental Resilience/College of Agronomy and Biotechnology/National Maize Improvement Center/Center for Crop Functional Genomics and Molecular Breeding,China Agricultural University,Beijing 100193,China

Institute of Agricultural Biotechnology,Jilin Academy of Agricultural Sciences,Gongzhuling 136100,Jilin,China

Maize Research Institute,Jilin Academy of Agricultural Sciences,Gongzhuling 136100,Jilin,China

College of Agronomy/State Key Laboratory of Crop Biology,Shandong Agricultural University,Tai'an 271018,Shandong,China

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Jiangsu province Seed Industry Revitalization projectBeijing Germplasm Creation and Variety Selection and Breeding Joint Project

JBGS2021002NY2023-180

2024

10.1016/j.cj.2024.05.009

作物学报(英文版)

作物学报(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.12(4)
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