作　　者： ; ; ;

机构地区： 海南大学农学院

出　　处： 《热带作物学报》 2015年第4期645-649,共5页

摘　　要： 以狗牙根为研究对象,利用水培法进行耐铝鉴定,初步研究不同铝浓度胁迫对狗牙根叶色、耐铝指数、坪用质量、枯黄率、相对地上部干重、相对根系干重的影响。结果表明,在250、500、750、1 000、1 250μmol/L铝浓度处理下,狗牙根受胁迫影响较小,不同浓度处理之间差异不明显。在1 500、1 750、2 000、2 250μmol/L铝浓度处理下,狗牙根随着胁迫时间的增长,叶色、均一性逐渐降低。在2 500、2 750、3 000、3 250、3 500μmol/L铝浓度处理下,狗牙根受胁迫影响较大,叶色、均一性明显降低,与对照相比表现出显著差异或极显著差异。通过建立回归方程,以狗牙根耐铝指数下降到60%作为狗牙根存活临界铝离子浓度,求得狗牙根致死临界铝浓度为2 520μmol/L。 Cynodon dactylon was used as the main research object for the study. Different tolerance of Cynodon dactylon to Al3＋was determined by leaf color, plant uniformity, aluminum tolerance index, turf quality, leaf firing percentage, relative dry weight（DW） of plant root, relative DW of up-ground plant part. The results showed that there was little effect by 250, 500, 750, 1 000, 1 250 μmol/L Al3 ＋concentration stress, no obvious differences between different concentrations. At 1 500, 1 750, 2 000, 2 250 μmol/L Al3＋concentration stress, leaf color, plant uniformity decreased over time. At 2 500, 2 750, 3 000, 3 250, 3 500 μmol/L Al3＋concentration stress, there was significant or very significant difference between Al3＋treatments and with the stress time increasing, the leaf color,uniformity decreased significantly. Based on a regression equation and taking the concentration when the tolerance dropped to 60% as the critical aluminum tolerance one, it was calculate that the lethal Al3 ＋concentration of Cynodon dactylon was 2 520 μmol/L.

关 键 词： 狗牙根 铝胁迫 水培 临界浓度

领　　域： [农业科学] [农业科学] [农业科学] [农业科学]