模拟干旱诱导对藜抗旱力的影响

以藜为研究材料,经过5年人工模拟干旱诱导,测定其耐旱形态结构及生理特征的改变以探讨提高植物抗旱的途径。结果表明,经模拟干旱诱导后藜叶片典型耐旱特征增加:叶片厚度和肉质度增加,比叶面积、饱和渗透势和蒸腾速率下降,渗透调节能力和持水力增强,临界饱和亏值增大,蒸腾效率提高。经干旱诱导形成耐旱特征后收获的种子种植于正常供水环境中长成的植株仍能保持其已形成的耐旱特征,在重度干旱胁迫下经过干旱诱导的植株各抗旱指标与对照相比有明显差异(P<0.01),证明藜是耐旱可变植物,可通过干旱诱导锻炼提高其抗旱性。

Effect of simulated drought inducement on drought-resistance of Chenopodium album

To search after the approach of improving plant drought-resistance, the morphological and physiological indexes of drought-resistance of Chenopodium album were measured by five-years simulated drought inducement. The result shows that after simulated drought inducement, C.album could increase its leaf's typical drought-resistance characteristics: the blade thickness and succulence added, the specific leaf area, saturation osmotic potential and transpiration rate dropped, the osmotic regulation and water-holding capacities enhanced, and meanwhile, the critical saturation deficit value and transpiration efficiency increased. When the seeds with drought-resistance characterisitics, which were harvested after drought inducement, were planted in normal watered soil, the plants could keep the formed drought-resistance characteristics. The drought-resistance indexes were significant different(P<0.01) between induced and control plants when they were planted in critical drought-stressed soil. It is suggested that C.album is a species with variable drought-resistance, and its drought-resistance could be improved by drought training.