Gene duplication confers enhanced expression of 27-kDa gamma-zein for endosperm modification in quality protein maize

文献类型： 外文期刊

第一作者： Liu, Hongjun

作者： Liu, Hongjun;Sun, Chuanlong;Zheng, Xixi;Yuan, Ningning;Li, Changsheng;Zhang, Zhiyong;Deng, Yiting;Wang, Jiechen;Wu, Yongrui;Shi, Junpeng;Lai, Jinsheng;Shi, Junpeng;Lai, Jinsheng;Gong, Hao;Huang, Xuehui;Feng, Qi;Han, Bin;Fan, Xingming;Qiu, Fazhan;Pan, Guangtang;Pan, Guangtang

作者机构：

关键词： QPM;o2 modifiers;endosperm;artificial selection;gene duplication

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.205； 五年影响因子：12.291 ）

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收录情况： SCI

摘要： The maize opaque2 (o2) mutant has a high nutritional value but it develops a chalky endosperm that limits its practical use. Genetic selection for o2 modifiers can convert the normally chalky endosperm of the mutant into a hard, vitreous phenotype, yielding what is known as quality protein maize (QPM). Previous studies have shown that enhanced expression of 27-kDa gamma-zein in QPM is essential for endosperm modification. Taking advantage of genome-wide association study analysis of a natural population, linkage mapping analysis of a recombinant inbred line population, and map-based cloning, we identified a quantitative trait locus (q gamma 27) affecting expression of 27-kDa gamma-zein. q gamma 27 was mapped to the same region as the major o2 modifier (o2 modifier1) on chromosome 7 near the 27-kDa gamma-zein locus. q gamma 27 resulted from a 15.26-kb duplication at the 27-kDa gamma-zein locus, which increases the level of gene expression. This duplication occurred before maize domestication; however, the gene structure of q gamma 27 appears to be unstable and the DNA rearrangement frequently occurs at this locus. Because enhanced expression of 27-kDa gamma-zein is critical for endosperm modification in QPM, q gamma 27 is expected to be under artificial selection. This discovery provides a useful molecular marker that can be used to accelerate QPM breeding.

分类号： N

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