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LHD1,an Allele of DTH8/Ghd8,Controls Late Heading Date in Common Wild Rice (Oryza rufipogon)

Journal of Integrative Plant Biology 2012年第10期54卷 790-799页

作者： Xiaodong Dai Younian Ding Lubin Tan Yongcai Fu Fengxia Liu Zuofeng Zhu Xianyou Sun Xuewen Sun Ping Gu Hongwei Cai Chuanqing Sun State Key Laboratory of Plant Physiology and Biochemistry National Evaluation Centre for Agricultural Wild Plants(Rice)Laboratory ofCrop Heterosis and Utilization of the Ministry of EducationBeijing Key Laboratory of Crop Genetic ImprovementDepartment of PlantGenetics and BreedingChina Agricultural UniversityBeijing 100193China

Flowering at suitable time is very important for plants to adapt to complicated environments and produce their seeds successfully for reproduction. In rice （Oryza rufipogon Griff.） photoperiod regulation is one of the important factors for controlling heading date. Common wild rice, the ancestor of cultivated rice, exhibits a late heading date and a more sensitive photoperiodic response than cultivated rice. Here, through map-based cloning, we identified a major quantitative trait loci （QTL） LHD1 （Late Heading Date 1）, an allele of DTH8/Ghd8, which controls the late heading date of wild rice and encodes a putative HAP3/NF-YB/CBF-A subunit of the ccaat-box-binding transcription factor. Sequence analysis revealed that several variants in the coding region of LHD1 were correlated with a late heading date, and a further complementary study successfully rescued the phenotype. These results suggest that a functional site for LHD1 could be among those variants present in the coding region. We also found that LHD1 could down-regulate the expression of several floral transition activators such as Ehdl, Hd3a and RFT1 under long-day conditions, but not under short-day conditions. This indicates that LHD1 may delay flowering by repressing the expression of Ehdl, Hd3a and RFT1 under long-day conditions.

关键词： Rice LHD1 heading date ccaat-box-binding transcription factor.

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