铝胁迫下7个不同大豆品种幼苗的生长反应

铝毒是酸性土壤中农业生产的限制因子，抑制植物根的生长，减低植物的耐旱性，引起营养缺乏和植物其他生理生化方面的改变。大豆是一种富营养植物，特别是蛋白含量很高，并且常被用于改良土壤。笔者对7个大豆基因型(品种)，在含有2mmol／L铝和不含有铝的溶液中培养2周，进行随机化完全区组设计实验，以研究不同基因型的大豆幼苗对铝胁迫的生长反应。结果显示，在铝胁迫下培养的幼苗，其上胚轴长度、株高、根长、鲜重、干重以及叶绿素含量等都有所下降，但不同基因型品种的幼苗对于铝胁迫呈现一定的差异反应。7个品种按照相应幼苗根生长的数据分为3组：在铝胁迫下，南农73—935和大黄豆是供试品种中耐受性最好的基因型(根生长仅减少15％)；南农87C-38和Williams是最敏感的(减少37％～39％)；1138-2，洪引1号和科丰1号(减少23％～27％)的反应则介于以上两者之间。

The Growth Response of Seven Soybean Cultivar Seedlings Under Aluminum Stress

Aluminum(Al) toxicity is a limiting factor for agriculture in acidic soils where it results in an inhibition of root growth,drought intolerance,nutrient deficiencies and other physiological and biochemical changes in plants.Soybean is highly nutritious being particularly rich in protein content and useful for soil improvement.In present study,the seedlings of 7 soybean cultivars were grown in solution with or without 2mmol/L Al stress in a randomized complete block design experiment for 2 weeks,to evaluate the differential responses of soybean genotypes to Al stress on seedling growth.Results showed that epicotyl length,seedling height,root length,fresh and dry weights,and chlorophyll content were decreased for the cultivars tested under Al stress.There was no uniform response of the cultivars to Al stress in seedling growth.However,seven cultivars seem to be categorized as 3 groups,based on the relative root growth data as follows.Nannong 73-935 and Dahuangdou were the most tolerant(15% reduction) and Nannong 87C-38 and Williams were the most sensitive(37%～39% reduction);1138-2,Hongyin No.1 and Kefeng No.1(23%～27% reduction) showed intermediate response under Al stress.