Genetic Architecture of Natural Variation in Rice Chlorophyll Content Revealed by a Genome-Wide Association Study

Molecular Plant
Quanxiu WangGongwei Wang

Abstract

Chlorophyll content is one of the most important physiological traits as it is closely related to leaf photosynthesis and crop yield potential. So far, few genes have been reported to be involved in natural variation of chlorophyll content in rice (Oryza sativa) and the extent of variations explored is very limited. We conducted a genome-wide association study (GWAS) using a diverse worldwide collection of 529 O. sativa accessions. A total of 46 significant association loci were identified. Three F2 mapping populations with parents selected from the association panel were tested for validation of GWAS signals. We clearly demonstrated that Grain number, plant height, and heading date7 (Ghd7) was a major locus for natural variation of chlorophyll content at the heading stage by combining evidence from near-isogenic lines and transgenic plants. The enhanced expression of Ghd7 decreased the chlorophyll content, mainly through down-regulating the expression of genes involved in the biosynthesis of chlorophyll and chloroplast. In addition, Narrow leaf1 (NAL1) corresponded to one significant association region repeatedly detected over two years. We revealed a high degree of polymorphism in the 5' UTR and four non-synonymous SNPs in th...Continue Reading

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Aug 14, 2015·Plant Biotechnology Journal·Yang Jae KangSuk-Ha Lee
Feb 23, 2017·Annual Review of Plant Biology·Christos BazakosOlivier Loudet
Dec 9, 2017·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Xinxin TangSibin Yu
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May 1, 2021·International Journal of Molecular Sciences·Sichul Lee, Celine Masclaux-Daubresse
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