多花黑麦草品种DUS测试数量性状分级分析

对多花黑麦草(Lolium multiflorum Lam.)7个品种进行了不同时期30个数量性状指标的测定,利用数量性状对多花黑麦草性状进行了概率分级的研究,并进行了相关性分析。结果表明,30个数量性状变异范围在7.55%~40.65%之间,变异系数最大的是分蘖数,最小的是千粒重。根据各数量性状的K-S检验及χ2检验,发现仅少部分性状不符合χ2分布;最终将28个数量性状分为5个等级,另外将抽穗期(春化后)和分蘖数分为3个等级。多花黑麦草的30个数量性状之间相关性分析结果表明株高与生长习性、小穗数与小穗密度、上部节间长与节间数呈极显著负相关,花序长与小穗密度呈极显著正相关。研究结果为多花黑麦草品种的鉴定评价、品种选育及数量性状的分级提供了理论依据。

Classification Analysis for Italian Ryegrass DUS Testing Quantitative Traits

Quantitative traits of 7 Italian ryegrass varieties were measured in different growth periods and correlation of 30 quantitative traits were analyzed. The results showed that coefficient of variation of the 30 quantitative traits accessions varied from 7.55% to 40.65%, and the variation coefficient of tiller number was the biggest, while the variation coefficient of thousand seed weight was the least. According to the quantitative traits of K-S test and chi-square test, only a small number of properties did not conform to the chi-square distribution; finally, the 28 quantitative traits could be divided into 5 grades, but the time of inflorescence emergence and the tiller number could be divided into 3 grades. The correlation analysis of 30 quantitative traits indicated that the height and the vegetative growth habit, the number of spikelet and the density of spikelet, and the length of upper internode and the number of internode were all showed highly significant negative correlation, while the length of inflorescence and the spikelet density were showed highly significant positive correlation. These results can provide basic information for variety identification, breeding, and quantitative traits classification of Italian ryegrass.