Possible Water Movement from Older to Younger Leaves and Photosynthesis During Drought Stress in Two Succulent Species from South Africa, Delosperma tradescantioides Bgr. and Prenia sladeniana L. Bol. (Mesembryanthemaceae)

Possible Water Movement from Older to Younger Leaves and Photosynthesis During Drought Stress in Two Succulent Species from South Africa, Delosperma tradescantioides Bgr. and Prenia sladeniana L. Bol. (Mesembryanthemaceae) by Arnd V. T├╝ffers, Craig E. Martin, Dieter J. von Willert.

Water loss and chlorophyll a fluorescence kinetics in younger leaves of Prenia sladeniana Delosperma tradescantioides were measured during period desiccation shoots with older attached those removed. the both species was significantly lower when remained on shoot, although this effect much more pronounced P. . A large decline parameter F V /F M , quantifying quantum yield photochemistry (Butler Kitajima, 1975; Bolhar-Nordenkampf et al., 1989), drought observed leaves. This smaller shoot. In D. only slight treatment, presence did not influence decline. Photochemical quenching (qP) decreased treatment species, while non-photochemical (qN) increased. No significant difference between without found. These results are discussed relation to potential avoidance mechanisms these species. We conclude from that for unlike water shift is most likely major feature adaptation.

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