Bradford K J
Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra City, ACT 2601 Australia.
Plant Physiol. 1983 Oct;73(2):480-3. doi: 10.1104/pp.73.2.480.
Ethylene, abscisic acid, and cytokinins were tested for their ability to either induce or prevent the changes which occur in gas exchange characteristics of tomato (Lycopersicon esculentum Mill. cv. Rheinlands Ruhm) leaves during short-term soil flooding. Ethylene, which increases in the shoots of flooded plants, had no effect on stomatal conductance or photosynthetic capacity of drained plants. Abscisic acid, which also accumulates in the shoots of flooded plants, could reproduce the stomatal behavior of flooded plants when sprayed on the leaves of drained plants. However, photosynthetic capacity of drained plants was unaffected by abscisic acid sprays. Cytokinin export from the roots to the shoots declines in flooded plants. Spray applications of benzyladenine increased stomatal conductance in both flooded and drained plants. In addition, the decline in photosynthetic capacity during flooding was largely prevented by supplementary cytokinin applications. The possible involvement of these growth substances in modifying leaf gas exchange during flooding is discussed.
对乙烯、脱落酸和细胞分裂素进行了测试，以考察它们诱导或防止番茄（Lycopersicon esculentum Mill. cv. Rheinlands Ruhm）叶片在短期土壤淹水期间气体交换特征发生变化的能力。乙烯在淹水植物的地上部中含量增加，但对排水植物的气孔导度或光合能力没有影响。脱落酸也在淹水植物的地上部中积累，当喷洒在排水植物的叶片上时，它可以重现淹水植物的气孔行为。然而，排水植物的光合能力不受脱落酸喷洒的影响。在淹水植物中，细胞分裂素从根部向地上部的输出减少。喷洒苄基腺嘌呤可增加淹水和排水植物的气孔导度。此外，通过补充细胞分裂素可在很大程度上防止淹水期间光合能力的下降。本文讨论了这些生长物质在淹水期间调节叶片气体交换中可能的作用。
