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Position: Home > Articles > Ectopic expression of OsNF-YA8, an endosperm-specific nuclearfactor Y transcription-factor gene, causes vegetative and reproductivedevelopment defects in rice The Crop Journal 2023,11 (6)

Ectopic expression of OsNF-YA8, an endosperm-specific nuclearfactor Y transcription-factor gene, causes vegetative and reproductivedevelopment defects in rice

作者：

Niu, Baixiao;Xu, Jing;Zhiguo, E.;Zhang, Zhenyu;Lu, Xinming;Chen, Che

单位：

Yangzhou Univ, Agr Coll, Jiangsu Key Lab Crop Genom & Mol Breeding, Zhongshan Biol Breeding Lab, Yangzhou 225009, Jiangsu, Peoples R China.; Chen, Chen] Yangzhou Univ, Agr Coll, Key Lab Plant Funct Genom, Minist Educ, Yangzhou 225009, Jiangsu, Peoples R China.;[Zhiguo, E.] China Natl Rice Res Inst, Key Lab Rice Biol, Hangzhou 311400, Zhejiang, Peoples R China; Chen, Chen] Yangzhou Univ, Jiangsu Coinnovat Ctr Modern Prod Technol Grain Cr, Yangzhou 225009, Jiangsu, Peoples R China.;[Niu, Baixiao

关键词：

Rice;OsNF-YA8;Plant height;Flowering time;Seed developmen

摘要：

Nuclear factor Y (NF-Y), a group of conserved transcription-factor complexes that consist of NF-YA, B, and C subunits, is essential for developmental regulation and for responses to environmental changes in eukaryotes. We previously found that some NF-Y genes, such as OsNF-YA8, were expressed specifically in the endosperm of rice. In the present study, overexpression of OsNF-YA8 in rice resulted in reduced plant height due to suppressed cell elongation in internodes. Gibberellin (GA) biosynthetic genes, includ-ing OsCPS1, OsGA20ox1, and OsGA20ox2, were down-regulated. OsNF-YA8 bound to the promoters of these genes to repress their expression. Endogenous GA content was decreased in OsNF-YA8 overexpres-sors, whose dwarf phenotype could be partially rescued by exogenous GA treatment. The findings sug-gested that ectopic expression of OsNF-YA8 causes defective GA biosynthesis in vegetative stage. Heading date in OsNF-YA8 overexpressors was delayed, especially under short-day conditions. OsNF-YA8 bound to the promoter of Heading Date 3a (Hd3a), the florigen gene in rice, to negatively regulate flowering. Either ectopic activation or knockout of OsNF-YA8 impaired seed development, as indicated by reduced seed size and increased grain chalkiness. These results suggest that ectopic expression of the endosperm-specific OsNF-YA8 in rice disrupts both vegetative and reproductive development. (c) 2023 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Ectopic expression of OsNF-YA8, an endosperm-specific nuclearfactor Y transcription-factor gene, causes vegetative and reproductivedevelopment defects in rice

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