垄作模式下甜高粱对农田渍害胁迫的响应

Responses of sweet sorghum under ridge culture pattern to farmland waterlogging stress

我国长江中下游地区常年降水较多,易形成农田渍害。为探究渍害胁迫对甜高粱(Sorghum dochna)产量性状和抗氧化酶系统的影响,设计了平作和垄作两个处理,在甜高粱三叶期对其进行渍水处理,测定并比较各处理的抗氧化酶系统活性和产量性状。结果表明,苗期遭受渍害胁迫,垄作处理下甜高粱的茎粗、单株干重、叶数、叶面积指数均显著高于平作(P<0.05)。株高和茎叶比在两个处理间无显著差异(P>0.05);与平作处理相比,渍害胁迫下甜高粱叶片的抗氧化酶[超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)]活性更强。研究表明,垄作耕作方式能够提高甜高粱耐受渍害胁迫的能力,获得更高的产量。

Waterlogging is easily caused by common and heavy precipitation in the middle and lower reach regions of the Yangtze River in China.In this study,two culture patterns,ridge and flat,were conducted to determine the effect of culture patterns on the yield traits and antioxidant enzyme activity of sweet sorghum.The yield traits and antioxidant enzymes activity were evaluated and compared after applying waterlogging stress at the seedling stage.The results showed that when the sweet sorghum suffered waterlogging stress at the seedling stage,the stem diameter,dry weight per plant,number of leaves,and leaf area index（LAI）under the ridge culture pattern were significantly higher than those under the flat culture pattern（P〈0.05）.Meanwhile,the height and stem and leaf ratio of plants under ridge culture showed little differences compared to those under the flat culture pattern（P〉0.05）,and waterlogging stress had less impact on the antioxidant enzyme activities;SOD,POD and CAT were continually highly expressed under the ridge culture pattern.In conclusion,the experiment demonstrated that the application of ridge pattern culture improved the adaptability and yield of sweet sorghum under waterlogging stress.