Mechanism of benzyladenine-induced chlorophyll synthesis in excised cucumber cotyledons

Mudliar, A.; Bharti, S.

Biochemie and Physiologie der Pflanzen 179(5): 345-349


DOI: 10.1016/s0015-3796(84)80010-4
Accession: 001221666

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Excised cotyledons from cucumber seedlings were floated on distilled water (control) or a 4.5 x 10-5M aqueous solution of BA and placed in light (25 W/msuperscript 2) at about 25 degrees C. BA stimulated the release of Mn from its endogenous bound or complexed stage, indicated by relatively sharp peaks in the electron spin resonance spectra of Mn2+ during the 24 h of study. In the treated cotyledons chlorophyll developed more rapidly than in controls and after 24 h the content was twice as high. The effect of MnCl2 on chlorophyll production was also investigated and shown to be greater than that of BA alone, since it increased the content by 4 times. Of 5 other bivalent cations tested, Mg2+ was the most effective in stimulating chlorophyll production.