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Physiological Changes In Portulacaria Afra (L.) Jacq. During A Summer Drought And Rewatering, Lonnie J. Guralnick, Irwin P. Ting
Physiological Changes In Portulacaria Afra (L.) Jacq. During A Summer Drought And Rewatering, Lonnie J. Guralnick, Irwin P. Ting
Arts & Sciences Faculty Publications
The changes of titratable acidity, enzyme activity, water status, and pigment composition were studied in Portulacaria afra (L.) Jacq. during a normal summer drought and rewatering. Two groups of plants were grown outside under a clear plastic canopy with water stress initiated at 2-week intervals in May 1986. Drought resulted in a linear decrease of fresh weight for 80 days and there was no further fresh weight change for the next 65 days. Nocturnal CO(2) uptake remained measurable for 83 days. Cessation of exogenous CO(2) uptake corresponded to the point where the pressure potential (Psi(p)) became zero. Ribulose-1, 5-bisphosphate (RuBP) …