Drought stress effects on three cultivars of Eragrostis curvula:: photosynthesis and water relations
Drought stress effects on three cultivars of Eragrostis curvula:: photosynthesis and water relations
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DOI：
10.1023/a:1013392421117
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发表时间：
2001-06-01
影响因子：
4.2
通讯作者：
Vazzana, C
中科院分区：
文献类型：
--
作者：
Colom, MR;Vazzana, C
以3个弯画眉草品种为材料，研究了水分胁迫对弯画眉草的影响。在胁迫开始和恢复后测定了叶片水势、RWC、总叶面积、绿色干重质量百分比和CO2气体交换。在3天的水分胁迫后，cv Tanganyika植物的RWC约为对照的30-40%，而cvs埃尔梅洛和Consol的RWC约为对照的50-60%。然而，中午和黎明前的水势较低的cvs坦噶尼喀和埃尔梅洛比ev康索尔。复水后，RWC和水势恢复只有在康索尔植物。在水分胁迫期间，在cvs埃尔梅洛和康索尔中记录到叶面积的强烈减少（比对照的叶面积小约91-94%）。光合作用下降的功能，在所有品种的水分胁迫的严重程度。此外，光饱和光合作用，CO2量子产率和光饱和光合作用发生，强烈减少水分胁迫。恢复光合作用被发现在cv康索尔五天后重新浇水。Cv Consol表现出较好的保水能力和较强的抗水分胁迫能力。
Water stress effects were studied on three cultivars of Eragrostis curvula. Leaf water potential, RWC, total plant leaf area, green dry weight mass percentage and CO2 gas-exchange were measured during the onset of stress and after recovery. After 3 days of water stress, RWC of cv Tanganyika plants was around 30-40% of controls, while RWC of cvs Ermelo and Consol was around 50-60% of controls. However midday and predawn water potentials were lower in cvs Tanganyka and Ermelo than in ev Consol. After re-watering, RWC and water potentials recovered only in Consol plants. A strong decrease of leaf area was recorded in cvs Ermelo and Consol during water stress (about 91-94% less than the leaf area of controls). Photosynthesis decreased as a function of the degree of water stress severity in all cultivars. Also, light saturated photosynthesis, CO2 quantum yield and light at which saturated photosynthesis occurred, were strongly reduced by water stress. Recovery of photosynthesis was found in cv Consol after five days re-watering. Cv Consol showed a better conservation of water and higher resistance to water stress than the other two cvs.