【摘要】 为探究不同倍性多花黑麦草的抗旱能力，同时筛选优异种质资源，以23份不同倍性多花黑麦草为材料，在PEG-6000模拟干旱条件下进行种子萌发期抗旱性评价，测定相对胚根长、相对胚芽长、相对发芽率等6项萌发生长指标，结合隶属函数分析、主成分分析和聚类分析对其抗旱性进行综合评价。结果表明：干旱处理下，四倍体多花黑麦草的根长和芽长均高于二倍体，分别高1.79倍和1.26倍。主成分分析表明：活力指数和根长分别为萌发因子和根部生长因子中的主要成分，载荷量分别为0.924和0.743。23份材料的D值变化范围为0.117～0.946,材料PI 238886的D值最低，PI 343155的D值最高。对D值进行聚类分析，筛选出四倍体抗旱材料5份(PI 343155、特高、929-3、川农1号、PI 619469),二倍体抗旱材料5份(PI 266111、PI 283610、PI 619471、PI 634251、W6 9271),中等材料9份，干旱敏感材料4份。更多还原

【Abstract】 To explore the drought resistance ability of different ploidy ryegrass(Lolium multiflorum) and screen excellent germplasm resources, 23 ryegrass germplasms were used to evaluate drought resistance during seed germination under PEG-6000 simulated drought conditions in this study. Six indexes, such as relative root length, relative shoot length, and relative germination rate were measured. The drought tolerance of ryegrass was comprehensively evaluated by membership function analysis, principal component analysis and cluster analysis. The results showed that the root length and shoot length of tetraploid ryegrass were 1.79 times and 1.26 times higher than that of diploid ryegrass under drought treatment, respectively. Principal component analysis showed that vigor index and root length were the main components of germination factor and root growth factor, respectively, and the loading capacity was 0.924 and 0.743, respectively. The D value of 23 materials ranged from 0.117 to 0.946, among which the D value of PI 238886 was the lowest while that of PI 343155 was the highest. Five tetraploid drought resistant materials(PI 343155, Tetragold, 929-3, Chuannong No.1, PI 619469) and five diploid drought resistant materials(PI 266111, PI 283610, PI 619471, PI 634251, W6 9271) were selected by cluster analysis. Nine medium and 4 drought sensitive materials were also identified in this study.更多还原