多花黑麦草幼穗分化进程对种子生产性状的影响

The Effect of Differentiation Process at Seedling Stage in the Young Ear Organs of Italian Ryegrass,Lolium multiflorum,on Its Seed Productivity

两年分期播种试验结果表明，多花黑麦草幼穗分化进程对穗部性状和种子产量有显著影响。幼穗分化的天数与每穗种子粒数呈极显著正相关。播种愈早，幼穗分化天数愈多，种子产量愈高。南京地区留种的多花草麦草的最佳播期为８月２０日至９月１０日。二棱期是多花黑麦草通过春化阶段的形态标志，也是幼穗能否分化完全的转折点。单棱至护颖分化期是影响种子粒数最关键的时期。

The spike differentiation process of Italian Ryegrass,Lolium multiflorum,usually has a remarkable influence on some characters of spike growth and seed production with regard to yieldage. In our trial,there was a significantly positive relationship existed between the ear differentiation stage lasted and the grain number harvest per spike. The earlier the sowing date,the longer the growing days of spike differentiation lasted and also the higher the seed yieldage. The best sowing date in Nanjing was recorded from August 20 to September 10. The double ridge was showing a morphologically markable character in Lolium multiflorum in which it had passed through vernalization. The days of duration had lengthened from the single ridge to glume differentiation, which were showing to us ,being the best important phase that affecting the grain number per spike,somewhat.