Physiological aspects of domestication in diploid wheat
Physiological aspects of domestication in diploid wheat
复制标题
二倍体小麦驯化的生理方面
DOI：
10.1007/bf00033984
复制
发表时间：
1981
期刊：
影响因子：
1.9
通讯作者：
S. Tsunoda
中科院分区：
文献类型：
--
作者：
S. Kishitani;S. Tsunoda
摘要对一种野生单粒小麦（Triticum boeoticum，W）和一种驯化单粒小麦（T. monococcum，C）的光合响应进行了比较研究。即使在干燥的空气和干燥的土壤条件下，每单位叶面积，W也表现出更好的光合和蒸腾活性。在任何土壤水势水平下，其叶水势始终高于C。 W和C之间严重干旱后光合恢复的差异也很明显。复水后20 h，W组叶片的光合速率、蒸腾速率和水分状况与非胁迫叶片基本相同，而C组叶片光合速率约为非胁迫叶片的一半，蒸腾速率较低，气体扩散阻力较高。 W能够在大范围的土壤水势范围内保持适当的水平衡并从严重干旱中迅速恢复，这似乎是对其坚硬生境的适应的结果。然而，在良好的供水条件下，C的单位叶片氮光合速率高于W。这可能有利于在改善供水保证的耕地上带来比W更好的植物生长。
SummaryA comparative study of photosynthetic response to water stress was conducted with one genotype of wild einkorn (Triticum boeoticum, W) and one of domesticated einkorn (T. monococcum, C).Per unit leaf area, W showed a better performance for photosynthetic and transpiration activities, even under dry air and dry soil conditions. Its leaf water potential was always higher than that of C at any level of soil water potential. The difference in photosynthetic recovery from severe drought between W and C was also obvious. The photosynthetic rate, transpiration rate and water status of the leaves observed at 20 h after rewatering was almost the same as non-stressed leaves in W, whereas in C the photosynthetic rate was about half that of the non-stressed leaves, which was accompanied with a low transpiration rate and a high gas diffusion resistance. The ability of W to maintain a proper water balance over a wide range of soil water potential and to recover rapidly from severe drought seems to be a result of adaptation to its hard habitats.However, under favourable water supply, the photosynthetic rate per unit leaf nitrogen was higher in C than in W. This may be advantageous to bring about a better plant growth than W on the arable land where the improved water supply is guaranteed.