利用模型方法研究西兰花种子萌发的温度特性

为研究西兰花种子萌发对不同温度的响应，以西兰花‘台绿1 号’为材料，在4~38℃温度区间进行种子萌发实验，结合Logistic 函数和积温模型公式计算种子萌发的最低温度、最适温度和积温。结果表明：西兰花‘台绿1 号’种子在16~32℃温度区间发芽率在93%以上，发芽率较高，而4、10℃低温条件下平均发芽时间最长，发芽势为0，38℃高温发芽率较低，低温和高温明显抑制西兰花种子萌发；西兰花‘台绿1 号’种子萌发适宜温度范围是20~32℃，最适温度为32℃，最低温度Tb为3.98℃；西兰花‘台绿1 号’种子累积萌发率达50%所需要的积温值是22.70℃·d；西兰花种子萌发时间t 可利用公式t=22.70/(T-3.98)进行预测（T代表萌发温度）。利用模型方法定量分析西兰花种子萌发对温度的需求是可行的。

Study on Temperature Characteristics of Broccoli Seed Germination Using Modeling Approach

Our objective was to research the broccoli seed germination response to different temperatures. An experiment of broccoli‘Tailv 1’seed germination was conducted under a constant temperature range of 4-38℃. This paper calculated the base temperature, the optimum temperature and the thermal time for seed germination using Logistic function and the thermal time model. The germination rate of‘Tailv 1’under the temperature range from 16℃ to 32℃ was above 93%, which was high. The mean germination time was the longest and the germination potential was 0 under 4℃ and 10℃. The seed germination rate was lower under 38℃ . Broccoli seed germination was significantly inhibited under low and high temperature. The suitable temperature range was 20℃ to 32℃, and the optimum temperature was 32℃. Broccoli seeds of‘Tailv 1’had a basal temperature of 3.98℃ for germination. Seeds of‘Tailv 1’required 22.70℃ · d to reach the seed accumulated germination rate of 50% . Broccoli seed germination time could be predicted by formula t=22.70/(T-3.98), T represented the germination temperature. The quantitative analysis of the temperature requirement of broccoli seed germination using modeling approach is feasible.