Relative sensitivity of photosynthetic assimilation and translocation of carbon to water stress.
Relative sensitivity of photosynthetic assimilation and translocation of carbon to water stress.
复制标题
光合同化和碳易位对水分胁迫的相对敏感性。
DOI：
10.1104/pp.64.5.852
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发表时间：
1979
期刊：
影响因子：
7.4
通讯作者：
D. Krieg
中科院分区：
文献类型：
--
作者：
F. Sung;D. Krieg
在棉花和高粱中评估了受水分胁迫强度和植物发育阶段影响的光合作用和易位率变化之间的关系，分别代表C（3）和C（4）光合类型。随着中午叶水势从-14 下降到-27，两个物种的光合速率均降低。在相当的叶水势下，与棉花相比，高粱保持了更高的光合作用和易位率；然而，高粱中每巴水势下降的变化率大于棉花。在易位速率发生任何显着变化之前，光合作用速率随着水分胁迫的增加而降低，这表明光合作用是这两个过程中更敏感的一个。严重的水分胁迫，相当于-27巴的叶水势，并没有完全抑制光合作用或易位。
The relationship between photosynthesis and translocation rate changes as affected by water stress intensity and stage of plant development was evaluated in cotton and sorghum, representing a C(3) and a C(4) photosynthetic type, respectively. Photosynthetic rates were reduced as midday leaf water potentials declined from -14 to -27 bars in both species. Sorghum maintained higher photosynthesis and translocation rates compared to cotton at comparable leaf water potentials; however, the rate of change per bar decline in water potential was greater in sorghum than in cotton. Photosynthetic rates were reduced with increasing water stress prior to any significant change in translocation rates suggesting that photosynthesis is the more sensitive of the two processes. Severe water stress, corresponding to leaf water potentials of -27 bars, did not completely inhibit either photosynthesis or translocation.