The relationship between transpiration and chlorophyll synthesis in etiolated squash cotyledons

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Abstract
Etiolated cotyledons of squash (Cucurbita moschata Duch. var. melonaeformis Makino cv. Tokyo) treated with kinetin, KCl or fusicoccin in the dark increased both transpiration in the dark and chlorophyll synthesis after exposure to light. The minimum period of kinetin treatment to stimulate transpiration was similar to that to accelerate chlorophyll synthesis. On the other hand, treatment of cotyledons with vaseline or abscisic acid markedly inhibited both transpiration and chlorophyll synthesis, suggesting that cytokinin-induced stimulation of chlorophyll synthesis could be mediated through the effect on the stomatal opening.