Transcriptional Activation of CAM Genes During Development and Environmental Stress

摘要: Crassulacean acid metabolism (CAM) can be defined as the ability to perform significant CO2 assimilation into C4 acids (mainly malic acid) in dark. Reutilization of stored results a characteristic diel (24 h) pattern organic-acid fluctuation along with reciprocal fluctuating levels storage glucan. CAM is found primarily, although not exclusively, succulent plants, particularly those having large chloroplast-containing parenchyma cells store amounts and water. plants are mainly tropical or subtropical origin typically inhabit arid environments periodic water deficits such semi-deserts, regions Mediterranean climates, epiphytic habitats forests (Kluge Ting 1978). Their ecological distribution observation that open their stomata at night close them during day avoid excessive evaporative loss have led general consensus functional adaptation dry means conservation. However, all occur environments. Isoetes related species which grow aquatic display (Keeley Busch 1984). In these instances, provides source carbon when environment become limiting day.