Plant and Cell Physiology, 2002, Vol. 43, No. 5 494-504
© 2002 Oxford University Press
Isolation of Rice Genes Possibly Involved in the Photoperiodic Control of Flowering by a Fluorescent Differential Display Method
Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, 630-0101 Japan
To better understand the molecular mechanisms of the photoperiodic regulation of rice, a short-day plant, we isolated 27 cDNAs that were differentially expressed in the photoperiod-insensitive se5 mutant from approximately 8,400 independent mRNA species by the use of a fluorescent differential display (FDD). For this screening, we isolated mRNAs at five different time points during the night and compared their expression patterns between se5 and the wild type. Of 27 cDNAs isolated, 12 showed diurnal expression patterns often associated with genes involved in the determination of the flowering time. In se5, expression of nine cDNAs was increased. Five of these cDNAs were up-regulated under SD, suggesting that they may promote flowering under SD. They included genes encoding a cDNA containing a putative NAC domain, the fructose-bisphosphate aldolase, and a protease inhibitor. Expression of three cDNAs was decreased in se5 but not photoperiodically regulated. These cDNAs included a rice homolog of Arabidopsis GIGANTEA (GI), lir1, and a gene for myo-inositol 1-phosphate synthase, all of which were previously shown to be under the control of circadian clocks. The expression patterns of the rice homolog of GI, OsGI, were similar to those of the Arabidopsis GI, suggesting the conservation of some mechanisms for the photoperiodic regulation of flowering between these two species.
1 Present address: National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602 Japan.
2 Corresponding author: E-mail, simamoto@bs.aist-nara.ac.jp; Fax, +81-743-72-5509.
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