镉胁迫对多年生黑麦草种质幼苗生长的影响

Effects of cadmium stress on seedling growth of perennial ryegrass germplasm

通过盆栽试验研究镉胁迫对20份多年生黑麦草(Lolium perenne)种质材料苗期存活率、株高、分蘖数、地上和地下生物量的影响及品种间的耐镉性差异。结果表明,随着镉浓度的增加,多年生黑麦草的相对存活率和相对地下生物量显著降低(P<0.05);相对株高、相对分蘖数和相对地上生物量呈先上升后下降的趋势。20份多年生黑麦草种质的耐镉性存在显著差异。通过隶属函数法进行综合评价,来自日本的全明星(L.p12)和荷兰的阿诺(L.p13)耐镉性较强;来自美国的李恩(L.p18)和英国的雷维尔勒(L.p16)耐镉性较差。

Pot experiment was conducted to study the cadmium tolerance of 20 Lolium perenne germplasm to cadmium stress. Seedling survival rate, plant height, tillers number, aboveground and underground biomass and varietal cadmium tolerance were tested. With the increasing concentrations of cadmium, relative survival rate and relative underground biomass of L. perenne germplasm decreased significantly （P〈0.05）, and relative plant height, relative tiller number and relative above-ground biomass increased firstly and declined lately. Significant differences in cadmium tolerance were observed among 20 germplasm. Comprehensive evaluation through the membership function method revealed that All-star from Japan （L. p12） and Arnold from the Netherlands （L. p13） had high tolerance to cadmium and Lee Eun from the United States （L. p18） and Levy Earle from the United Kingdom （L. p16） had less tolerance to cadmium.