Sisson W B, Caldwell M M
Department of Range Science and The Ecology Center, Utah State University, Logan, Utah 84322.
Plant Physiol. 1976 Oct;58(4):563-8. doi: 10.1104/pp.58.4.563.
Net photosynthesis, dark respiration, and growth of Rumex patientia L. exposed to a ultraviolet irradiance (288-315 nanometers) simulating a 0.18 atm.cm stratospheric ozone column were determined. The ultraviolet irradiance corresponding to this 38% ozone decrease from normal was shown to be an effective inhibitor of photosynthesis and leaf growth. The repressive action on photosynthesis accumulated through time whereas leaf growth was retarded only during the initial few days of exposure. Small increases in dark respiration rates occurred but did not continue to increase with longer exposure periods. A reduction in total plant dry weight and leaf area of approximately 50% occurred after 22 days of treatment, whereas chlorophyll concentrations remained unaltered.
测定了皱叶酸模在模拟平流层臭氧柱为0.18 atm·cm的紫外线辐照度(288 - 315纳米)下的净光合作用、暗呼吸作用和生长情况。与正常情况相比,臭氧减少38%时对应的紫外线辐照度被证明是光合作用和叶片生长的有效抑制剂。对光合作用的抑制作用随时间累积,而叶片生长仅在暴露的最初几天受到抑制。暗呼吸速率有小幅增加,但随着暴露时间延长并未持续上升。处理22天后,植株总干重和叶面积减少了约50%,而叶绿素浓度保持不变。