Role of Petiole in Protein Metabolism of Senescing Betel (Piper betle L.) Leaves

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Abstract
Effects of depetiolation on protein metabolism during senescence of detached betel (P. betle L.) leaves were studied. In normal petiolated leaves, the level of chlorophyll and proteins and extent of protein synthesis declined, while the protease activity increased with the advancement of senescence. These changes were delayed by depetiolation/de-midribbing treatments without affecting the general pattern of senescence. The presence of petiole seems to expedite protein degradation, probably due to earlier attainment of the optimal concentration of proposed senescence factor(s).