期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1974
卷号：71
期号：8
页码：3243-3247
DOI：10.1073/pnas.71.8.3243
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Water stress induced by floating discs cut from cotton leaves (Gossypium hirsutum L. cultivar Stoneville) on a polyethylene glycol solution (water potential, -10 bars) was associated with marked alteration of ultrastructural organization of both chloroplasts and mitochondria. Ultrastructural organization of chloroplasts was sometimes almost completely destroyed; peroxisomes seemed not to be affected; and chloroplast ribosomes disappeared. Also accompanying water stress was a sharp increase in activity of acid phosphatase [orthophosphoric-monoester phosphohydrolase (acid optimum), EC 3.1.3.2 ], and acid and alkaline lipase [glycerol ester hydrolase EC 3.1.1.3 ] within chloroplasts. Only acid lipase activity was detected inside mitochondria of stressed discs. These alterations in cell organization and enzymology may account for at least part of the previously reported effects of water stress on the CO2 compensation point, photochemical reactions, and photorespiration.
