PHOTOSENSITIVITY OF HYPOCOTYL HOOK OF CAESIUM-TREATED TOMATO SEEDLINGS

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Summary

Hypocotyls of etiolated caesium-treated tomato seedlings were morphologically similar to, but shorter than, those of the etiolated water control seedlings. Chlorophyll development became manifest in the cotyledons of both the caesium-treated and control seedlings when exposed to white or red light but brown discolouration, reduction in diameter, and subsequent deterioration of the hypocotyl hook were evident in the caesium-treated seedlings exposed to white or red light. It is suggested that the hypocotyl hook is the primary site of caesium-induced photosensitivity of tomato seedlings.

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