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Originally published in Science Express on 19 April 2007
Science 18 May 2007:
Vol. 316. no. 5827, pp. 1033 - 1036
DOI: 10.1126/science.1141753
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Reports

Hd3a Protein Is a Mobile Flowering Signal in Rice

Shojiro Tamaki, Shoichi Matsuo, Hann Ling Wong, Shuji Yokoi,* Ko Shimamoto{dagger}

Florigen, the mobile signal that moves from an induced leaf to the shoot apex and causes flowering, has eluded identification since it was first proposed 70 years ago. 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. We show that the protein encoded by Hd3a, a rice ortholog of FT, moves from the leaf to the shoot apical meristem and induces flowering in rice. These results suggest that the Hd3a protein may be the rice florigen.

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.

{dagger} To whom correspondence should be addressed. E-mail: simamoto{at}bs.naist.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)