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Daily malate fluctuations in Sedum dasyphyllum L.
Authors:A Fioretto  A Vírzo De Santo  G Bartoli  A Alfani
Institution:1. Dipartimento di Ecologia , Università della Calabria , 87030, Arcavacata di Rende (CS), Italy;2. Dipartimento di Biologia Vegetale , Università di Napoli , Via Foria 223, 80139, Napoli, Italy;3. ENEL, Laboratorio di Sessa Aurunca , Caserta, Italy
Abstract:Abstract

Sedum dasyphyllum L. leaves of well-watered plants kept outdoors and under controlled conditions show diurnal malic acid fluctuations. In well-watered plants growing outdoors the malate accumulation undergoes seasonal variations and seems to be inhibited by short photoperiod and/or by low temperature. The seasonal variations of CAM activity correspond to seasonal variations of mesophyll succulence. Water stress markedly depressed CAM activity. In fact, plants of S. dasyphyllum show, under controlled conditions, a decrease of malate accumulation as relative water content decreases. Recovery from water stress is fairly slow. Water potential quickly increases during rewatering and exceeds the original value after few days, suggesting a consumption of osmotic compounds during the water stress period.
Keywords:CAM  Sedum dasyphyllum L    Mesophyll succulence
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