摘要
High grain protein content(GPC) reduces rice eating and cooking quality(ECQ). We generated OsAAP6 and OsAAP10 knockout mutants in three high-yielding japonica varieties and one japonica line using the CRISPR/Cas9 system. Mutation efficiency varied with genetic background in the T_0 generation, and GPC in the T_1 generation decreased significantly,owing mainly to a reduction in glutelin content. Amylose content was down-regulated significantly in some Osaap6 and all Osaap10 mutants. The increased taste value of these mutants was supported by Rapid Visco Analysis(RVA) profiles, which showed higher peak viscosity and breakdown viscosity and lower setback viscosity than the wild type. There were no significant deficiencies in agronomic traits of the mutants. Targeted mutagenesis of OsAAP6 and OsAAP10, especially OsAAP10, using the CRISPR/Cas9 system can rapidly reduce GPC and improve ECQ of rice, providing a new strategy for the breeding cultivars with desired ECQ.
基金
financially supported by National Key Research and Development Program of China(2016YFD0100501)
the National Natural Science Foundation of China(31871241,31371233)
the Natural Science Foundation of Jiangsu Province(BE2017345,PZCZ201702,BE2018351)
the Research and Innovation Program of Postgraduate in Jiangsu Province(KYCX17_1886)
the Priority Academic Program Development of Jiangsu Higher Education Institutions
the Yangzhou University International Academic Exchange Fund。
