玉米幼苗根系形态对芘污染的响应

Response of root morphology of maize (Zea mays L.) seedling to pyrene contamination in soil

采用盆栽试验探讨了玉米(Zea mays L.)根系形态学参数(根质量长度、根质量面积、根质量体积、根平均直径及不同根直径等级分布)对不同浓度芘污染胁迫的响应。较低浓度芘可适当地刺激玉米的生长,高浓度芘处理抑制了玉米的生长,并且抑制作用随芘处理浓度的提高而增强;芘对玉米根系的影响要大于对茎叶的影响。不同浓度芘处理下玉米根系形态学参数发生了显著的变化,与对照相比,芘处理下根直径显著降低,根质量长度、根质量面积和根质量体积显著增大,且随芘处理浓度的提高其效应更显著。

Pot experiment was conducted to study the effect of pyrene contamination on the maize seedling root growth,including qualitative parameters of root morphology like specific root length（SRL）,specific root surface area（SRA）,specific root volume（SRV）,average root diameter（ARD）,and distribution of root diameter classes of maize were evaluated at an early growth stage.Maize growth was slightly improved at the lower pyrene concentration,while inhibited at higher pyrene concentration,and the effect enhanced with increasing initial pyrene concentration in soil.The effect of pyrene on root growth was higher than shoot.The parameters of root morphology of maize were significant changed with treated with pyrene.ARD was significantly decreased,while SRL,SRA and SRV were significantly increased with increasing soil pyrene concentration as compared to uncontaminated.