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Jpn. J. Crop Sci. 76 2 279 287 2007
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Estimation of Sterility Percentage Caused by Cool Temperature in Rice Plants Using Nonparametric Regression Eiji
KANDA1), Yoichi TORIGOE
2), Tetsuhisa MIWA3) and Takashi KOBAYASHI
1) (1)Natl. Agric. Res. Cent. for Tohoku Region, Morioka, Iwate
020-0198, Japan; 2)Natl. Agric. Res. Cent. for Western Region; 3)Natl. Inst. Agro-Environ. Sci.)
Abstract To evaluate the incidence of cool summer damage as early as possible, we made a model to estimate the sterility
percentage from the cool degree days in the consecutive developmental stages of young panicles. For estimation of the
sterility percentage, we used nonparametric regression with, the limitation that the values of the adjoined partial regression
coeffi cient are not greatly different. The parameter for water temperature was decided from the relation between the
water temperature and sterility percentage in the deep fl ooding experiments with cv. Akitakomachi. The contribution rate of
the model using this parameter for estimation of sterile percentage was 77.2 . This parameter may be applied to other
cultivars by assuming the difference of cool summer tolerance as the difference in the base temperatures of cool degree days.
The base temperatures for cv. Sasanishiki, Akitakomachi and Hitomebore were 21.0 , 20.5 and 19.5 , respectively. The
parameter for air temperature was decided using several varieties with different cool summer tolerances the damage from
cool summer in 2003 at Tohoku areas. The parameter of air temperature was useful for the evaluation of cool summer
damage in the fi elds though the accuracy was lower than the parameter for water temperature. In conclusion, we can
estimate the sterility percentage caused by cool summer in real time by running this model.
Key words Cool degree days, Cool summer tolerance, Nonparametric regression, Paddy rice, Sterility caused by cool
summer, Sterility percentage.
1939. 1
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14 : 2049 2060 2261 2269.
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most sensitive stage to cooling and the fertilizing ability of pistils.
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XXVIII. Prevention of cool injury with the newly devised water
management practices effects of the temperature and depth of
water before the critical stage. Jpn. Jour. Crop Sci. 57 : 234 241.
Satake, T. 1989. Male sterility caused by cooling treatment at the young
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47 : 105 108.
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[II] . 12 :
177 195.
1940b.
[IV]
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1976.
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1994. .
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