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Proc Natl Acad Sci U S A. 2014 Nov 18;111(46):16337-42. doi: 10.1073/pnas.1418204111. Epub 2014 Nov 5.

Days to heading 7, a major quantitative locus determining photoperiod sensitivity and regional adaptation in rice.

Author information

1
National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, 100081 Beijing, China; National Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, 210095 Nanjing, China;
2
National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, 100081 Beijing, China;
3
State Key Laboratory of Hybrid Rice, China National Hybrid Rice Research and Development Center, 410125 Changsha, China;
4
Crop Research and Breeding Center of Land-Reclamanation of Heilongjiang Province, 150090 Harbin, China; and.
5
College of Agriculture, Hainan University, 570028 Haikou, China.
6
National Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, 210095 Nanjing, China;
7
State Key Laboratory of Hybrid Rice, China National Hybrid Rice Research and Development Center, 410125 Changsha, China; lpyuan@hhrrc.ac.cn wanjianmin@caas.cn.
8
National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, 100081 Beijing, China; National Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, 210095 Nanjing, China; lpyuan@hhrrc.ac.cn wanjianmin@caas.cn.

Abstract

Success of modern agriculture relies heavily on breeding of crops with maximal regional adaptability and yield potentials. A major limiting factor for crop cultivation is their flowering time, which is strongly regulated by day length (photoperiod) and temperature. Here we report identification and characterization of Days to heading 7 (DTH7), a major genetic locus underlying photoperiod sensitivity and grain yield in rice. Map-based cloning reveals that DTH7 encodes a pseudo-response regulator protein and its expression is regulated by photoperiod. We show that in long days DTH7 acts downstream of the photoreceptor phytochrome B to repress the expression of Ehd1, an up-regulator of the "florigen" genes (Hd3a and RFT1), leading to delayed flowering. Further, we find that haplotype combinations of DTH7 with Grain number, plant height, and heading date 7 (Ghd7) and DTH8 correlate well with the heading date and grain yield of rice under different photoperiod conditions. Our data provide not only a macroscopic view of the genetic control of photoperiod sensitivity in rice but also a foundation for breeding of rice cultivars better adapted to the target environments using rational design.

KEYWORDS:

DTH7; flowering time; grain yield; photoperiod sensitivity; rice

PMID:
25378698
PMCID:
PMC4246261
DOI:
10.1073/pnas.1418204111
[Indexed for MEDLINE]
Free PMC Article

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