一年生早熟禾种子萌发适宜温度研究

Study on suitable temperature for seed germinationof Poa annua

摘要:

【目的】 探究一年生早熟禾（Poa annua）种子萌发适宜温度。【方法】 试验以甘肃省16 个不同地区的野生一年生早熟禾种子为材料，设4、8、12、16、20、24、28 和32 ℃ 8 个恒温处理，研究温度对一年生早熟禾种子萌发的影响。【结果】 随着温度的升高，一年生早熟禾种子的发芽率、发芽势、发芽指数、胚根长、苗鲜重、活力指数均呈先增后减趋势，胚芽长呈逐渐增大趋势。结论隶属函数综合评价表明，光照周期为16 h 光照/8 h 黑暗，相对湿度55% 的恒温条件下，野生一年生早熟禾种子适宜萌发温度范围为16~24 ℃，最适萌发温度为24 ℃。

Abstract:

【Objective】 The investigation was performed to find the suitable temperature for seed germination of Poa annua.【Method】 The germplasm of wild annual Poa pratensisfrom 16 different areas in Gansu province wasused as materials in this experiment. Eight different temperature gradient treatments were set at 4，8，12，16，20，24，28 and 32 ℃. The effects of different temperature on seed germination of annual Poa pratensis were studied.【Result】The results showed that with the increase of temperature，the germination percentage，germination potential，germina-tion index，radicle length，seedling fresh weight and vitality index of annual Poa pratensis seeds increased firstly andthen decreased，while the plumule length increased gradually.【Conclusion】 The comprehensive evaluation of mem -bership function showed that the optimal temperature range for seed germination was 16~24 ℃ under the condition of16 h illumination /8 h darkness and 55% relative humidity，and the optimum germination temperature was 24 ℃.