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Gene duplication drove the loss of awn in sorghum.

Molecular Plant 2021年第11期14卷 1831-1845页

作者： Leina Zhou Can Zhu Xiaojian Fang Hangqin Liu Shuyang Zhong Yan Li Jiacheng Liu Yang Song Xing Jian Zhongwei Lin National Maize improvement Center Center for Crop Functional Genomics and Molecular BreedingJoint Laboratory for International Cooperation in Crop Molecular BreedingMinistry of EducationBeijing Key Laboratory of Crop Genetic ImprovementLaboratory of Crop Heterosis and UtilizationChina Agricultural UniversityBeijing 100193China

Loss of the awn in some cereals including sorghum is a key transition during cereal domestication or improvement that has facilitated grain harvest and *** genetic basis for the loss of awn in sorghum during domestication or improvement remains ***,we identified a transcription factor gene awn1 encoding an ALOG domain,which is responsible for awn loss during sorghum domestication or ***1 arose from a gene duplication from chromosome 10 that translocated to chromosome 3,recruiting a new promoter from the neighbouring intergenic region filled with"noncoding DNA",and recreating the first exon and *** awn1 acquires high expr`ession after duplication and represses the elongation of awns in domesticated *** mapping revealed a high collinearity at awn1 paralog locus on chromosome 10 across cereals and awn growth and development was successfully reactivated on the rice spikelet by inactivating rice awn1 *** RNA-seq and DAP-seq revealed that as a transcription repressor,AWN1 directly bound to the motif in the regulatory regions from three MADS genes related to flower development and two genes DL and LKS2 for the development of awn,downregulated the expressions of these genes,and then repressed the elongation of *** preexistence of regulatory elements in the neighbouring intergenic region of awn1 before domestication signified that noncoding DNA may serve as a treasure trove for evolution during adaptation to a changing *** results supported that gene duplication can promptly drive the evolution of gene regulatory network.

关键词： DAP-seq awn gene duplication sorghum domestication and improvement

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