Chabot Brain F, Chabot Jean Fincher
Section of Ecology and Systematics, Cornell University, 14853, Ithaca, New York, USA.
Oecologia. 1977 Dec;26(4):363-377. doi: 10.1007/BF00345535.
Fragaria vesca, the woodland strawberry, was grown under a series of controlled environments including variations in light intensity, average temperatures, and temperature amplitude around a constant mean. Observations on CO exchange capacities, leaf anatomy, and cell ultrastructure were made for each treatment to determine relationships between these variables. With increasing light intensity, leaf thickness, leaf density, and mesophyll cell surface area and volume per leaf surface area increased. Net photosynthesis (NPS) per leaf weight decreased with increasing light pretreatment while NPS per area increased from low to medium intensity, then decreased at the highest intensity. Depression of photosynthesis at the highest light pretreatment may have been due to massive starch accumulation in the chloroplasts associated with the sodium vapor lamps used. Correlation of all anatomical variables was highly significant with dark respiration and NPS per dry weight but insignificant for NPS per leaf area. In the variable temperature treatments, photosynthetic acclimation occurred with a shift in optimum temperature for NPS in the direction of prevailing growth temperature. Absolute rates were highest at moderate pretreatment temperatures and were reduced by extreme growth temperatures. Thick leaves with low density mesophyll became thinner and more dense with increasing growth temperature corresponding to an increase in maximum net photosynthetic rates. Leaves became thicker and more dense at the highest temperatures, but with an increase in cell damage and indications of changes in metabolic pathways. Highest correlations for gas exchange rates were with specific leaf weight (weight per area). Correlation with other anatomical variables were scattered or insignificant. It was concluded that adaptation to a range of environmental conditions cannot be consistently attributed to changes in mesophyll cell volume or surface area.
森林草莓（Fragaria vesca）在一系列可控环境中生长，这些环境包括光照强度、平均温度以及围绕恒定均值的温度振幅的变化。针对每种处理，对二氧化碳交换能力、叶片解剖结构和细胞超微结构进行了观察，以确定这些变量之间的关系。随着光照强度的增加，叶片厚度、叶片密度以及叶肉细胞表面积和每叶表面积的体积均增加。随着光照预处理强度的增加，每叶重的净光合作用（NPS）降低，而每面积的NPS从低强度增加到中等强度，然后在最高强度时降低。在最高光照预处理下光合作用的下降可能是由于与所使用的钠蒸气灯相关的叶绿体中大量淀粉积累所致。所有解剖变量与暗呼吸和每干重的NPS高度相关，但与每叶面积的NPS不相关。在变温处理中，光合作用发生适应，NPS的最适温度朝着主要生长温度的方向移动。绝对速率在中等预处理温度下最高，并因极端生长温度而降低。随着生长温度的升高，低密度叶肉的厚叶变得更薄且更致密，这与最大净光合速率的增加相对应。在最高温度下，叶片变得更厚且更致密，但细胞损伤增加且有代谢途径变化的迹象。气体交换速率与比叶重（每面积重量）的相关性最高。与其他解剖变量的相关性则分散或不显著。得出的结论是，对一系列环境条件的适应不能始终归因于叶肉细胞体积或表面积的变化。
