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Plant Cell Physiol. 2012 Apr;53(4):709-16. doi: 10.1093/pcp/pcs028. Epub 2012 Mar 6.

Natural variation in Hd17, a homolog of Arabidopsis ELF3 that is involved in rice photoperiodic flowering.

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  • 1National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan.


Flowering time of rice depends strongly on photoperiodic responses. We previously identified a quantitative trait locus, Heading date 17 (Hd17), that is associated with a difference in flowering time between Japanese rice (Oryza sativa L.) cultivars. Here, we show that the difference may result from a single nucleotide polymorphism within a putative gene that encodes a homolog of the Arabidopsis EARLY FLOWERING 3 protein, which plays important roles in maintaining circadian rhythms. Our results demonstrate that natural variation in Hd17 may change the transcription level of a flowering repressor, Grain number, plant height and heading date 7 (Ghd7), suggesting that Hd17 is part of rice's photoperiodic flowering pathway.

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