Evidence that ethylene is not involved in red light induced stimulation of chlorophyll formation in etiolated cucumber cucumis sativus cultivar aonagajibai cotyledons

Dei, M.

Plant and Cell Physiology 22(4): 699-708


ISSN/ISBN: 0032-0781
Accession: 005412314

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The involvement of ethylene in red-light-induced stimulation of chlorophyll (Chl) formation was studied because one of the red-light effects on Chl formation (the late-appearing effect) interacts with the ethylene effect in 3 day old excised etiolated cotyledons of cucumber (C. sativus L. cv. Aonagajibai). Ethylene production by etiolated cotyledons of intact seedlings in the dark is enhanced by a red-light pulse, but the effect does not occur in excised cotyledons. Application of ethylene in the dark to 3 day old intact seedlings has little effect on Chl formation in the cotyledon during subsequent continuous illumination, although ethylene pretreatment of 5 day old seedlings significantly stimulates Chl formation. Removal of endogenous ethylene by mercuric perchlorate does not specifically suppress the red-light action on Chl formation in both attached and excised cotyledons. Inhibition of ethylene synthesis by aminoethoxyvinylglycine does not affect the red-light effect on Chl formation in excised cotyledons. Ethylene apparently does not operate as a mediator of red light in stimulating Chl formation in either attached or excised cotyledons.