菹草石芽大小和贮藏温度对萌发及幼苗生长的影响

Effects of Weight and Store Temperature on Turion Germination and Seedling growth of Potamogeton crispus L.

通过萌发实验探讨了菹草石芽重量和贮藏温度对石芽萌发及幼苗生长的影响。结果表明:成熟的菹草石芽大小不一,按鲜重划分重量等级,各等级石芽数量占总数量的百分比差异很大,重量中等的石芽数量占到80%以上;重量对石芽最终萌发率没有影响,但重量小的石芽萌发时间较早,重量大的石芽虽然萌发较晚但是最终萌生的幼苗数目较多。石芽重量和萌发结束时幼苗数目之间呈显著的线性正相关(p<0.05);连续去苗过程中,重量大的石芽萌发率和萌发幼苗数保持较高水平;经过贮藏的石芽与未经贮藏的石芽相比,萌发快且萌发整齐。经过15℃贮藏的石芽萌发最早,高温(25℃)和低温(4℃)贮藏均会使石芽最终萌发出的幼苗数目减少,3种温度下贮藏的石芽最终萌发率和幼苗长度无显著差异。

Effects of ecological factor such as water depth and light on turion germination of Potamogeton crispus L. had been studied much. By field investigation, the authors found that turion weight , their quantitive ratio and the time to germinate differed significantly. Effects of these factors on turion germination and seedling growth were not studied before. Germination experiment was done in our laboratory to supplement data about turion propagation of P. crispus L. and it may supply reference for population scale controlling of P. crispus L.. The results showed that weight of turions differed widely. Of all the turions, a 80% percentage was those with medium weight. Weight of turions had no effects on the final germination ratio but small turions germinated relative early. Big turions brought relative more seedlings lastly and the relationship between turion weight and finally seedling number was positively linear （p 〈 0. 05）. During continuous removal of seedlings, germination ratio and seedling number of big turion were keeping high. After three months store under different temperature, all turions germinated earlier and concentrative than those unstored. High temperature （ 25℃ ） and low temperature （4℃） went against to the number of seedlings. Store temperature had no effects on final germination ratio and the length of seedlings.