Research Papers

Genetic Analysis and Gene Mapping of a Virescent and Panicle AbortionMutant vpa1in Rice

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  • China National Center for Rice Improvement/ State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
*Corresponding author, E-mail: shiyongfeng@caas.cn

Received date: 2020-07-02

  Revised date: 2020-07-27

  Online published: 2021-01-10

Abstract

【Objective】Genes related to chloroplast development and panicle phenotype can be identified through the study onvirescent mutants and panicle apical abortion (paa) mutants in rice. 【Method】The main agronomic traits of vpa1 (virescent and panicle abortion 1) mutant and the wild-type were compared under conventional planting conditions in field. The virescent gene and paagene were mapped by bulked segregant analysis and map-based cloning.【Result】vpa1exhibited albino leaves at seedling stage andthe leaves graduallyreturned to normal. During heading stage,vpa1showed degeneration of spikelets at the tops of panicles. Except seed-setting rate, the agronomic traits including plant height, panicle length, number of filled grains per panicle and 1000-grain weight decreased significantly in vpa1as compared with the wild-type.Genetic analysis indicated that both the virescentphenotypeand the paa phenotype of vpa1are controlled by single recessive nuclear gene, and the virescentgene and paa gene were segregated independently.The virescent gene, Osv16, was mapped to a 125kb region between RM3441 and RM3029 on chromosome 3. Thepaagene, Ospaa10, was mapped to a 190kb region between RM11157 and RM5972 on chromosome 1.【Conclusion】mutations ofOsv16 and Ospaa10 causedsimultaneous variation of leaf color and spikelet phenotype in vpa1. Osv16 and Ospaa10are likely two new genes as no other virescent and paa genes have been identified in the related region, further cloning of both genes are currently underway.

Cite this article

Zhonghao WANG, Yan HE, Xiaobo ZHANG, Xia XU, WUJianli, SHIYongfeng . Genetic Analysis and Gene Mapping of a Virescent and Panicle AbortionMutant vpa1in Rice[J]. Chinese Journal OF Rice Science, 2021 , 35(1) : 19 -26 . DOI: 10.16819/j.1001-7216.2021.0702

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