EVALUATION OF STOMATAL ACTIVITY BY MEASURING LEAF TEMPERATURE DYNAMICS

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For evaluation of stomatal activity, dynamic characteristics of leaf temperatures in cucumber plants were analyzed under radiation of tungsten light in a controlled air of 30℃ and 40% relative humidity. When leaves were radiated, leaf temperature rose and appeared in oscillation. The oscillation of leaf temperature was caused by stomatal movement, and the degree of stomatal movement was evaluated by summing the amplitudes of the leaf temperature oscillation. Nodal distribution of the leaf temperatures was found clearly in a plant, and it appeared conceivable that the stomatal movements in the older and the younger (not fully expanded) leaves were slacker than those in the other leaves. The stomatal movement in the older leaves was able to be promoted when the stomatal movement in the leaves other than the older leaves was inhibited or the other leaves were excised. The stomatal movement in the younger leaves, however, was still slack and not promoted even in the same treatments where the stomatal movement in the leaves other than the younger leaves was inhibited or the other leaves were excised. These facts suggest that the older leaves maintain stomatal activity enough, but are sluggish in stomatal movement while stomata in the other leaves are acting sufficiently, and also suggest that the functions of stomata in the younger leaves have not yet been developed, and the stomatal activity is lower at all times. Thus, the stomatal activity was evaluated by leaf temperature analysis in the on-line system.
九州大学の論文

EVALUATION OF STOMATAL ACTIVITY BY MEASURING LEAF TEMPERATURE DYNAMICS

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