Pearcy Robert W
Department of Biological Sciences, State University of New York at Albany, 12222, Albany, New York, USA.
Oecologia. 1976 Sep;26(3):245-255. doi: 10.1007/BF00345293.
Comparative measurements of CO exchange and growth rates were made on Atriplex lentiformis (Torr.) Wats. plants from populations native to coastal as well as desert habitats in southern California. While both had similar CO exchange rates at moderate growth temperatures, the desert plants had a substantially greater capacity to acclimate to high growth temperatures indicating that clear ecotypic differences in acclimation capacity are present in this species. This large capacity for photosynthetic acclimation resulted in nearly equal CO exchange rates of the desert plants under the different day temperatures characteristic of the desert habitat during the summer and winter months. In contrast, the photosynthetic CO exchange rates of the coastal plants was markedly reduced by high growth temperatures. The large acclimation capacity of the desert plants may function to maintain high productivities during both the winter and summer months but would not be required in the coastal plants because of the moderate temperatures throughout the year in their native habitat.Relative growth rates (RGR) of the coastal and desert plants were similar at 23°C day/18°C night and 33°C day/25°C night growth temperatures. At 43°C day/30°C night temperatures, however, the RGR of the desert plants was higher than that of the coastal plants. Thus, the larger acclimation capacity of the desert plants is related to a greater ability to maintain high growth rates over a wide range of temperatures as compared to the coastal plants. Small differences in allocation patterns could account for differences in the comparative photosynthetic responses and growth rates in each temperature regime.
对来自加利福尼亚州南部沿海和沙漠栖息地的滨藜属植物（滨藜）的种群进行了二氧化碳交换和生长速率的比较测量。虽然在中等生长温度下两者的二氧化碳交换率相似，但沙漠植物对高生长温度的适应能力要强得多，这表明该物种在适应能力方面存在明显的生态型差异。这种强大的光合适应能力使得沙漠植物在夏季和冬季沙漠栖息地不同的日间温度下，其二氧化碳交换率几乎相等。相比之下，高生长温度会显著降低沿海植物的光合二氧化碳交换率。沙漠植物强大的适应能力可能有助于在冬季和夏季保持高生产力，但沿海植物由于其原生栖息地全年温度适中，因此不需要这种能力。沿海植物和沙漠植物在白天23°C/夜间18°C以及白天33°C/夜间25°C的生长温度下，相对生长速率（RGR）相似。然而，在白天43°C/夜间30°C的温度下，沙漠植物的RGR高于沿海植物。因此，与沿海植物相比，沙漠植物更大的适应能力与在更广泛温度范围内保持高生长速率的更强能力有关。分配模式上的微小差异可能解释了每种温度条件下比较光合响应和生长速率的差异。
