Some Effects of Alternating Temperature on the Growth of French Bean Plants

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Abstract
In the main experiment described plant dry weight and leaf area, relative growth-rate, net assimilation rate (on an area basis), leaf-weight ratio and leafarea ratio were studied for plants grown under a range of temperature régimes and in 12-hour days. Comparisons under conditions where the mean temperature was the same showed that final dry weight and leaf area were greatest at constant temperature and least where the temperature fluctuated about the mean value. These findings are discussed in relation to the concept of thermoperiodism, and in relation to the significant effects of day and night temperature upon the development of leaf area.

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