Investigations into the effects of elevated carbon dioxide and drought on the growth and physiology of carpet weed (Galenia pubescens Eckl. Zeyh.)

摘要

The present study aimed to examine the interactive effects of elevated atmospheric C02 concentration and drought stress on the growth and some of the physiological processes of Galenia pubescens. Photosynthetic rate of plants increased under elevatedC02 concentration, however drought caused significant reduction in net photosynthetic rate by (45% in 400 ppm CO_2) and (27% in 700 ppm CO_2) after five days simulating the drought treatment when compared with well-watered plants. Plants grown under elevated C02 level and well-watered produced a greater biomass (17.5 ± 0.5 g per plant) compared to the plants which were grown under the ambient CO_2 concentration.