Abstract: The growth rates and seed yields of the 15 parents and 45 progenies of 13 Zoysia cross combinations were evaluated by the measurements of total stolon length,aboveground biomass,and seed yields.The results show that:1.Abundant variations were detected in the total stolon length,aboveground biomass and seed yield among different materials.After five months of growth,the maximum total stolon length reached to 414.6 cm but the minimum only 23.4 cm;the maximum aboveground biomass was 32.39 g but the minimum 1.1 g;the coefficient of variation was 49.61% and 48.81%,respectively.The seed yield had the largest coefficient of variation reaching to 148.51% with the variation range of 0 to 1.32 g.2.Cross-breeding expanded the variance ranges of growth rate and seed yield of zoysiagrass.Among the tested 45 progenies,there were 62.2% in total stolon length,73.3% in aboveground biomass,and 68.9% in seed yield surpassed their parents.3.Hybrids 40-9 and 31-3 had the fastest growing rate with the total stolon length of 365.103 and 326.475 cm and the aboveground biomass of 25.418 and 24.479 g after 5-month growth which were not significantly different from Z014(Manila) and Z077(Zoysia japonica Steud.cv.Lanyin No.3),but obvious higher than those of Z129(Z.japonica cv.Qingdao).Hybrids 26-4,20-1,11-1,and 20-3 had high seed yields of 1.32,1.28,0.98,and 0.96 g 100 cm^-2,respectively,which were higher than the reported highest seed yield record of Z.japonica cv.Liaodong.4.The seed yield of the tested materials was significantly and negatively correlated with the total stolon length and aboveground biomass.

Key words: Zoysia Willd., Hybrids, Growth rate, Seed yield

摘要： 通过匍匐茎总长度、地上生物量和种子产量对结缕草属(Zoysia Willd.)植物13个杂交组合的15个亲本和45个杂交一代进行生长速度和种子产量的综合评价,结果表明:①不同材料的匍匐茎总长度、地上生物量和种子产量均存在较大的变异,经过5个月的生长,匍匐茎总长度的最大值达414.6cm,最小值仅23.4cm,地上生物量最大值为32.39g,最小值1.1 g,变异系数分别为49.61%和48.81%,种子产量的变异系数最大,达到148.51%,变异范围0~1.32g;②通过杂交可以扩大结缕草生长速度及种子产量的变异范围,所测定的45个后代中,匍匐茎总长度、地上生物量和种子产量分别有62.2%、73.3%和68.9%的后代超过双亲的变异范围;③杂交后代40-9与31-3生长速度最快,经过5个月的生长期,匍匐茎总长度分别为365.103 cm与326.475 cm,地上部生物量分别为25.418 g与24.479 g,与对照Z014(马尼拉)和Z077(‘兰引3号’结缕草)无显著差异,但均显著高于Z129(青岛结缕草)的152.15cm与11.974g;26-4、20-1、11-1与20-3的种子产量较高,分别为1.32 g/100cm²、1.28g/100cm²、0.98g/100cm²和0.96g/100cm²,均超过了已报道的辽宁结缕草的最高种子产量;④参试材料的匍匐茎总长度和地上生物量均与种子产量呈极显著的负相关。

关键词: 结缕草, 杂交后代, 生长速度, 种子产量