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Exploration and Validation of the Potential Downstream Genes Underlying ipa1-2D Locus for Rice Panicle Branching

Phyton-International Journal of Experimental Botany 2021年第3期90卷 773-787页

作者： Lin Zhang Dong Xie Zhong Bian Yiting Zou Han Zhou Wenlu Cai Hadi Yeilaghi Xiaolei Fan Changquan Zhang Qiaoquan Liu Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education Jiangsu Key Laboratory of Crop Genomics and Molecular BreedingYangzhou UniversityYangzhou225009China Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Jiangsu Key Laboratory of Crop Genetics and PhysiologyYangzhou UniversityYangzhou225009China

In recent years,some super hybrid rice varieties were bred with strong culms and large panicles,which are mainly contributed by the ipa1-2D locus.A gain-of-function allele of OsSPL14 is the ipa1-2D and it can greatly increase the panicle primary branch ***,the key downstream genes mediating this trait variation are not fully *** this study,we developed high-quality near-isogenic lines(NILs)with a difference of only 30 kb chromosomal segment covering the ipa1-2D *** the NILs,we explored the impact of ipa1-2D on five sequential stages of early inflorescence development,and found that the locus can greatly enhance the initiation of primary branch meristems.A transcriptomic analysis was performed to unveil the downstream molecular network of ipa1-2D,and 87 genes were found differentially expressed,many of which are involved in metabolism and catalysis *** addition,transgenic lines of overexpression and RNA interference were generated to shape different levels of *** were also used to validate the expression variation explored by *** on the gene annotation,twelve potential downstream targets of ipa1-2D were selected,and their expression variation was confirmed by qRT-PCR analysis both in NILs and transgenic *** research expands the molecular network underlying ipa1-2D and provides novel gene information which might be involved in the control of panicle *** discussed the potential function of identified genes and highlighted their values for future function exploration and breeding application.

关键词： Rice ipa1-2D panicle branching inflorescence meristems gene expression

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