FACTORS AFFECTING ABSCISSION IN SPIRODELA OLIGORHIZA (LEMNACEAE)

I. ULTRAVIOLET RADIATION

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SUMMARY

Exposure of plants of Spirodela oligorhiza to ultraviolet light results in a high percentage of abscission of daughter colonies. The levels of endogenous ABA and ethylene released in irradiated plants were similar to those of the non-irradiated controls. Pre-incubation on IAA very significantly reduced UV-induced abscission in spite of causing a large release of ethylene.

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