De Jong T M
Department of Botany, University of California, 95616, Davis, CA, USA.
Oecologia. 1978 Jan;34(3):343-351. doi: 10.1007/BF00344911.
Laboratory gas exchange measurements were conducted on four pioneering beach species from southern California. Atriplex leucophylla (Moq.) D. Dietr., a C species, had a photosynthetic temperature optimum substantially higher than leaf temperatures normally experienced on the beach during the primary growing season. The C species, Cakile maritima Scop., Ambrosia chamissonis Less. and Abronia maritima Nutt. ex Wats., had photosynthetic temperature optima close to their growth temperature and higher photosynthetic rates than the C species at normal field growth temperatures. Atriplex leucophylla had higher mesophyll conductances which resulted in higher water use efficiencies at all measurement temperatures. Leaf chlorophyll and protein contents were not correlated with photosynthetic rates. The possible significance of water use efficiency is discussed in relation to the characteristics of the beach habitat.
对来自南加州的四种先锋海滩植物进行了实验室气体交换测量。藜科植物白叶滨藜（Atriplex leucophylla (Moq.) D. Dietr.），一种C4植物，其光合温度最适值显著高于主要生长季节海滩上通常经历的叶片温度。C3植物滨海刺芹（Cakile maritima Scop.）、海滨春黄菊（Ambrosia chamissonis Less.）和海滨阿布罗尼亚（Abronia maritima Nutt. ex Wats.）的光合温度最适值接近其生长温度，并且在正常田间生长温度下比C4植物具有更高的光合速率。白叶滨藜具有更高的叶肉导度，这导致在所有测量温度下具有更高的水分利用效率。叶片叶绿素和蛋白质含量与光合速率无关。结合海滩栖息地的特征讨论了水分利用效率的可能意义。
