作　　者： (杨婧）; (张晓蓉）; (鲁松）;

机构地区： 成都市华阳中学,四川成都610213

出　　处： 《四川林业科技》 2017年第4期15-20,24,共7页

摘　　要： 通过发芽试验法比较了重金属镉胁迫下5种草坪草种的萌发响应情况,比较了几种草坪草种对镉的耐受性。实验以百三叶、紫花苜蓿、狗牙根、日本结缕草、马尼拉作为实验材料,比较其在不同浓度镉离了溶液处理下的发芽率、发芽指数及毒害率的变化。实验结果表明,随镉离子浓度增大,5种草坪草种发芽率均减小,毒害率均增大,发芽指数在整体上呈现减小的趋势。5种草坪草对镉离子的耐受性大小为:马尼拉>日本结缕草>百三叶>紫花苜蓿>狗牙根,低浓度的镉处理会促进马尼拉种子的萌发。本研究的结果为治理镉污染时草坪草的选种提供了参考,也为研究草坪草种在重金属胁迫中的防御机制提供了依据。 In this article, tests were conducted on the seed Cadmium stress. Comparisons were made on the changes of ity rate of Trifolium repens, germination of five kinds of turf grass under germination rate, germination index and toxico sativa, Cynodon dactylon, Zoysia japonica and Zoysia matrella under different concentrations of Cd^2 ＋ treatments. The results showed that higher Cd^2 ＋ concentration decreased the seeds germination rate, and increased the toxicity rate. The germination index showed a decreasing tendency to all grasses on the whole. The tolerance to Cd^2 ＋ successively diminished for Zoysia matrella, Zoysia japonica, Trifolium repens,Medicago sativa, and Cynodon dactylon. The low concentration of Cadmium treatment promoted the germination of Zoysia matrella. The study provided reference for the seed selection of turf grass in reducing Cd^2 ＋ pollution, and also laid a foundation in the study of the defense mechanism for turf grass under heavy metal stress.

关 键 词： 草坪草 镉胁迫 种子萌发