Seed sterility of Japanese rice varieties under short-day condition




Seed sterility was observed in most of photosensitive Japanese rice varieties in the second and third cropping seasons on Ishigaki island (24℃ 20' N, 124℃ 10' E). The sterility was not most likely caused by cool temperature, because the mean daily temperature during two weeks before the heading dates of these cropping season were higher than that of first cropping season. Short-day treatment ( 9 hours daylength ) at different stages using a strongly photoperiod-sensitive Japanese variety Shinrei lowered the percentage of fertilized spikelets. In particular, the continuos short-day treatment after the beginning of photoperiod-sensitive phase to the flowering resulted in the highest seed sterility. Since the percentage of sterility is highly correlated with the anther length and the number of engorged pollen grains per anther, the sterility is mainly due to lack of engorged pollen, which is caused by short-day treatment.


Japan International Research Center for Agricultural Sciences Okinawa Subtropical Station


Technical A

Term of research

FY1998 (FY1995-1998)

Responsible researcher

OKAMOTO Masahiro ( Okinawa Subtropical Station )

ODA Shunsuke ( Okinawa Subtropical Station )

TERAUCHI Takayoshi ( Okinawa Subtropical Station )

KOBAYASHl Makoto ( Okinawa Subtropical Station )

IDETA Osamu ( Okinawa Subtropical Station )

MATSUOKA Makoto ( Okinawa Subtropical Station )

NAGAMlNE Tsukasa ( National Institute of Agrobiological Sciences )

Japanese PDF

1998_17_A3_ja.pdf1.01 MB

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