Characterization of Epistatic Interaction of QTLs LH8 and EH3 Controlling Heading Date in Rice

被引：0

作者：

Jingbin Chen

Xiaoyan Li

Cheng Cheng

Yahuan Wang

Mao Qin

Haitao Zhu

Ruizhen Zeng

Xuelin Fu

Ziqiang Liu

Guiquan Zhang

机构：

[1] State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,

[2] Guangdong Key Laboratory of Plant Molecular Breeding,undefined

[3] College of Agriculture,undefined

[4] South China Agricultural University,undefined

[5] Institute of Vegetable Crops,undefined

[6] Jiangsu Academy of Agricultural Sciences,undefined

[7] College of Agronomy,undefined

[8] Northwest Agriculture & Forestry University,undefined

来源：

Scientific Reports | / 4卷

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摘要：

Heading date is a critical trait for adaptation of rice to different cultivation areas and cropping seasons. We evaluated the heading dates of 1,123 chromosome segments substitution lines (CSSLs) in the genetic background of an elite rice variety Huajingxian74 (HJX74). A CSSL with the substituted segments from Zihui100 exhibited late heading under both natural long-day (NLD) and natural short-day (NSD) conditions and the late heading phenotype was controlled by two novel epistatic loci on chromosome 8 and chromosome 3, respectively, termed LH8 and EH3. The function of EH3 was dependent on the LH8 genotype through epistatic interaction between EH3Zihui100 and LH8Zihui100 alleles. Genetic and molecular characterization revealed LH8 encodes a CCAAT-box-binding transcription factor with Heading date1 (Hd1)-binding activity and may delay flowering by repressing the expression of Early heading date1 (Ehd1). Our work provides a solid foundation for further study on gene interaction in heading date and has application in breeding rice with greater adaptability.

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