冬小麦根系对不同生育时期渍水胁迫的生物学响应

Biological Response of Winter Wheat Root System to Waterlogging Stress at Different Growth Stages

为了研究不同生育时期渍水逆境对北方地区生态条件下冬小麦根系及地上部生长发育的影响,进行了人工模拟小麦渍水试验。结果表明,各生育时期渍水均能使小麦上位次生根数量有所增加,根系POD活性在小麦生育前期也会因渍水而有所提高。但小麦根系总重、根系活力、根系SOD活性、单株绿叶面积、叶片氮、磷及叶绿素含量均因渍水而明显降低,根细胞过氧化产物MDA含量成倍增长。苗期、返青期、拔节期、孕穗期和灌浆期渍水20d分别导致小麦产量降低5.2%、20.8%、43.1%、61.8%和68.3%。

Effects of waterlogging of soil on root system and yield of winter wheat were studied in the Experimental Farm of Shanxi Agricultural University with pot culture from 2003 to 2004 by utilizing simulation-waterlogging at method different growth stages (seedling, returning-green, jointing, booting and filling). The results indicated that (1) long-term (20 d) waterlogging could increase the quantity of roots at every growth stages, and increase the activity of POD at seedling, returning-green, jointing and booting stage. However, the weight and activity of root, the green leaf area, the N, P and total chlorophyll content of leaf, and the activity of SOD decreased significantly, and the content of MDA increased sharply at the same time. (2) Compared with the control group, the waterlogging stress could decrease the yield of wheat 5.2%, 20.8%, 43.1%, 61.8%and 68.3% at seedling, returning-green, jointing, booting and filling stage, respectively.