Olszyk D M, Tibbitts T W
Department of Horticulture, University of Wisconsin, Madison, Wisconsin, 53706.
Plant Physiol. 1981 Mar;67(3):545-9. doi: 10.1104/pp.67.3.545.
Stomatal response during exposure to SO(2) and O(3) and subsequent leaf injury were examined in plants of Pisum sativum L. ;Alsweet' grown in a peat-vermiculite medium in controlled environment chambers. Plants developing under moisture stress, induced by drying the medium to 50% of field capacity, exhibited greater stomatal closure during exposures and less than one-fourth the necrosis compared to plants developing in a medium maintained at field capacity. Plants under moisture stress had only a slightly more negative plant water potential ( approximately -4.0 bars) than at field capacity ( approximately -3.4 bars). Plants exposed to pollutants for 2 hours near the beginning or end of a 16-hour light period had greater stomatal closure during exposures and less leaf necrosis than plants exposed during the middle of the light period.
在可控环境室内，对种植于泥炭-蛭石培养基中的豌豆（品种为‘Alsweet’）植株，研究了其在暴露于二氧化硫和臭氧期间的气孔反应以及随后的叶片损伤情况。通过将培养基干燥至田间持水量的50%来诱导水分胁迫下生长的植株，与在保持田间持水量的培养基中生长的植株相比，在暴露期间表现出更大程度的气孔关闭，坏死情况不到其四分之一。水分胁迫下的植株其植物水势（约为-4.0巴）仅比田间持水量时（约为-3.4巴）略负一点。在16小时光照期开始或结束附近暴露于污染物2小时的植株，与在光照期中间暴露的植株相比，在暴露期间有更大程度的气孔关闭和更少的叶片坏死。
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