A 2 fold action of benzyl adenine on chlorophyll formation in etiolated cucumber cucumis sativus cultivar aonagajibai cotyledons

Dei, M.

Physiologia Plantarum 56(4): 407-414

1982


ISSN/ISBN: 0031-9317
DOI: 10.1111/j.1399-3054.1982.tb04533.x
Accession: 004546492

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Abstract
Treatment of 3-day-old excised etiolated cotyledons of cucumber (C. sativus L. cv. Aonagajibai) with benzyladenine (BA) in the dark stimulates chlorophyll (Chl) formation during the lag phase (designated as lag elimination) and accelerates the steady-state rate of Chl formation under subsequent continuous illumination with white light. The separation of this 2-fold effect is possible using 2 different methods of BA treatment in darkness: a brief BA treatment followed by various periods of water treatment in darkness, or various periods of continuous dark BA treatment. In either treatment, BA rapidly eliminates the lag phase (the fast-appearing effect) and after a longer time period accelerates the steady-state (the late-appearing effect). With a brief BA treatment, both effects decay rapidly. In contrast, with continuous BA treatment, none of the effects decay after reaching their maxima, particularly in cotyledons excised 2 days after sowing and aged for a long period before the onset of BA treatment. BA may act as a trigger in stimulating Chl formation. The relationship between the actions of BA and light is discussed.

A 2 fold action of benzyl adenine on chlorophyll formation in etiolated cucumber cucumis sativus cultivar aonagajibai cotyledons