0023-6152

AA00697606

23670

査読無

0023-6152

AA00697606

A model of the flower stalk development in Chinese cabbage in response to low temperature was presented for the use in environment control of plant growth and development. The pattern of flower stalk development in response to low temperatures appeared in the sigmoid curve in time course and was fitted to the logistic curve. The asymptote of the logistic curve was given by the functions of treating duration (td) and degree (AT) of the subtraction of treating temperature from 20℃ (untreating condition). In order to evaluate the delay in rise of flower stalk development, the logistic curve was appoximated to the first order lag curve having the same asymptote and the same differential coefficient at 63.2 % of the asymptote as those of the logistic curve. From the equation of the first order lag curve, the time constant (T) and the dead time (L) were calculated to obtain the time of delay by summing T and L. The correlation coefficient of the time of delay on log₁₀ΔT^<1/2>・tα^2 was the largest and significant at 0.1 % level. From this finding, it is clear that log,,ΔT^<1/2>・tα^2 is usable for evaluating the efficiency of low temperature on flower stalk development. Thus, the model of flower stalk development was represented by a function of treating temperature, treating duration and time after low temerature treatment.