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A new method for on‐line measurement of diurnal change in potato tuber growth under controlled environments

A new method for on‐line measurement of diurnal change in potato tuber growth under controlled environments

Abstract

Abstract An on‐line laser micrometer system was applied to measurement of diurnal change in potato ( Solanum tuberosum L.) tuber growth. Diameters of the potato tuber were scanned by moving a laser micrometer along the longitudinal axis of the tuber at constant speed, and tuber volume was evaluated as an aggreg ate of thin discs. A single potato tuber, without competitive sink tubers in the plant, was grown in controlled air at 20 °C and 80% RH, and tuber volume was measured at 30 min intervals. During the growth experiment, the potato tuber increased in size without any inhibitory effect of periodical laser beam irradiation. Greatest expansion generally occurred during the early night, and transient contraction of the tuber occurred at the beginning of the light period.
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