草地早熟禾种子产量构成因素的品种差异

Variation in seed yield components among varieties of Poa pratensis.

对草地早熟禾 2 8个品种种子产量及性状进行了研究 .结果表明 ,2 8个品种间种子产量存在极显著差异 (P <0 .0 1) ,最高的品种为Balin和Monoply ,其产量达 6 4 3.4～ 6 5 0 .2kg·hm-2 ,为最低品种Elysee(90 .1kg·hm-2 )的 7.1倍 .生产性状相关分析表明 ,生殖枝数 /株、生殖枝高、花序长及小穗数 /生殖枝 4个性状为影响早熟禾种子产量的主要因素 .依据对种子产量及上述 4个性状测定值的聚类分析 ,可将 2 8个品种的种子生产性能分为极强、很强、强、中等、差和极差 6个类群 ,其中Monoply等 6品种为极强类群 ;Baronie、Balin和Sydsport、Entopper分别为很强和强类群 ;Nublue等 12品种为中等类群 ;Broadway等 4品种和Ram1。

Seed yield and its characteristics of 28 varieties of Poa pratensis in field plots at Lanzhou,China were evaluated in 2001.The results showed that the seed yields among the varieties were significantly different (P<0.01) by LSD test.The highest yield was 643.4～650.2kg·hm -2 obtained from varieties of Balin and Monoply, the lowest was 90.1kg·hm -2 obtained from Elysee, and the other varieties were in the middle groups with the yields varied from 114.7kg·hm -2 to 435.1kg·hm -2 .Correlation analysis between seed yield and yielding characteristics indicated that the main factors affecting seed yield were the number of fertile tillers per plant (r=0.785),the height of fertile tiller (r=0.712), the length of inflorescence (r=0.743), and the number of spikelets/fertile tiller (r=0.786).Cluster analysis for seed production capacity based on seed yield and above mentioned 4 main characteristics showed that the 28 varieties could be divided into 6 grades.