Department of Botany, University of Illinois, Urbana, Illinois 61801.
Plant Physiol. 1970 Aug;46(2):233-5. doi: 10.1104/pp.46.2.233.
Rates of photosynthesis, dark respiration, and leaf enlargement were studied in soil-grown corn (Zea mays), soybean (Glycine max), and sunflower (Helianthus annuus) plants at various leaf water potentials. As leaf water potentials decreased, leaf enlargement was inhibited earlier and more severely than photosynthesis or respiration. Except for low rates of enlargement, inhibition of leaf enlargement was similar in all three species, and was large when leaf water potentials dropped to about -4 bars.Intact sunflower leaves were held for 4 days at leaf water potentials which permitted maximal photosynthesis and respiration, but which inhibited leaf enlargement. Although leaf enlargement did not occur initially, enlargement resumed toward the end of the desiccation period. However, the rate of enlargement was not as rapid as in the well watered control, nor did it return to the control rate when the plant was rewatered.
在不同叶片水势下，研究了土壤中生长的玉米（Zea mays）、大豆（Glycine max）和向日葵（Helianthus annuus）的光合作用、暗呼吸和叶片扩张速率。随着叶片水势的降低，叶片扩张比光合作用或呼吸作用更早、更严重地受到抑制。除了低扩张率外，所有三种植物的叶片扩张抑制作用都相似，当叶片水势降至约-4 巴时，抑制作用很大。完整的向日葵叶片在允许最大光合作用和呼吸作用但抑制叶片扩张的叶片水势下保持 4 天。虽然最初没有发生叶片扩张，但在干燥期结束时，叶片扩张又重新开始。然而，扩张速度不如在充分浇水的对照中那样快，当植物重新浇水时，也没有恢复到对照速率。
