Steffen K L, Wheeler R M, Arora R, Palta J P, Tibbitts T W
Dept of Horticulture, Pennsylvania State Univ., University Park 16801, USA.
Physiol Plant. 1995;94(1):51-6.
We investigated the effect of temperature during growth and development on the relationship between light-harvesting capacity, indicated by chlorophyll concentration, and light-utilization potential, indicated by light- and bicarbonate-saturated photosynthetic oxygen evolution, in Solanum tuberosum L. cv. Norland. Clonal plantlets were transplanted and grown at 20 degrees C for 2 weeks before transfer to 12, 16, 20, 24 and 28 degrees C for 6 weeks. After 4 weeks of the temperature treatments, leaf tissue fresh weights per area were one-third higher in plants grown at 12 degrees C vs those grown at 28 degrees C. Conversely, chlorophyll content per area in tissue grown at 12 degrees C was less than one-half of that of tissue grown at 28 degrees C at 4 weeks. Photosynthetic capacity measured at a common temperature of 20 degrees C and expressed on a chlorophyll basis was inversely proportional to growth temperature. Leaf tissue from plants grown at 12 degrees C for 4 weeks had photosynthetic rates that were 3-fold higher on a chlorophyll basis than comparable tissue from plants grown at 28 degrees C. These results suggest that the relationship between light-harvesting capacity and light-utilization potential varies 3-fold in response to the growth temperatures examined. The role of this response in avoidance of photoinhibition is discussed.
我们研究了生长和发育期间的温度对马铃薯品种诺兰（Solanum tuberosum L. cv. Norland）中以叶绿素浓度表示的光捕获能力与以光和碳酸氢盐饱和光合放氧量表示的光利用潜力之间关系的影响。克隆苗在20℃下移栽并生长2周，然后转移到12、16、20、24和28℃下生长6周。温度处理4周后，在12℃下生长的植株每单位面积的叶片组织鲜重比在28℃下生长的植株高1/3。相反，在4周时，在12℃下生长的组织中每单位面积的叶绿素含量不到在28℃下生长的组织的一半。在20℃的共同温度下测量并以叶绿素为基础表示的光合能力与生长温度成反比。在12℃下生长4周的植株的叶片组织，其基于叶绿素的光合速率比在28℃下生长的植株的可比组织高3倍。这些结果表明，在所研究的生长温度范围内，光捕获能力与光利用潜力之间的关系变化了3倍。本文讨论了这种响应在避免光抑制中的作用。
