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Published Online April 19, 2007
Science DOI: 10.1126/science.1141753

Reports

Submitted on February 26, 2007
Accepted on April 6, 2007

Hd3a Protein Is a Mobile Flowering Signal in Rice

Shojiro Tamaki 1, Shoichi Matsuo 1, Hann Ling Wong 1, Shuji Yokoi 2, Ko Shimamoto 1*

1 Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan.
2 Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan; Present address: Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan.

* To whom correspondence should be addressed.
Ko Shimamoto , E-mail: simamoto{at}bs.naist.jp

Florigen, the mobile signal that moves from an induced leaf to the shoot apex and causes flowering, has eluded identification for the 70 years since it was first proposed. Understanding the nature of the mobile flowering signal would provide a key insight into the molecular mechanism of floral induction. Recent studies suggest that the Arabidopsis FLOWERING LOCUS T (FT) gene is a candidate for encoding florigen. Here we show that the protein encoded by Hd3a, a rice ortholog of FT, moves from the leaf to the shoot apical meristem (SAM) and induces flowering in rice. These results suggest that the Hd3a protein may be the rice florigen.


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