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试验于2013-2014年以高粱杂交种辽杂10、辽杂11和辽杂36为试材,对正常供水和干旱胁迫条件下的株高、叶面积、相对含水量、光合参数、地上部干重和保护性酶活性进行了比较与分析。结果表明,干旱胁迫条件下,高粱幼苗的出苗会有所延缓,叶片和根系的相对含水量均下降,叶片下降幅度大于根系;干旱胁迫导致净光合速率(Pn)下降,地上部物质积累减少,气孔导度(Gs)减小是Pn下降的主要原因;在干旱胁迫下,根系和叶片的过氧化物歧化酶(SOD)、过氧化物酶(POD)含量均显著高于正常供水处理,并且随着胁迫天数的增加呈抛物线状变化,在胁迫12d达到峰值。
The experiment was conducted in 2013-2014 with the hybrids of Liaoza 10, Liaoza 11 and Liaoza 36 as test materials. The plant height, leaf area, relative water content, photosynthetic parameters, Heavy and protective enzyme activity were compared and analyzed. The results showed that under drought stress, the emergence of sorghum seedlings would be delayed, the relative water content of leaves and roots decreased, and the decline of leaves was greater than that of roots. The drought stress led to the decrease of net photosynthetic rate (Pn) The decrease of stomatal conductance (Gs) was the main cause of Pn decline. Under drought stress, the contents of superoxide dismutase (SOD) and peroxidase (POD) in root and leaf were significantly higher than those in normal water supply With the increase of stress days parabolic changes, peaked 12 days after stress.