温度、土壤水分和NaCl对黄顶菊种子萌发的影响

Effects of Temperature,Soil Moisture and Sodium Chloride on Germination of Flaveria bidentis(L.) Kuntze Seeds

光照和黑暗条件下的黄顶菊种子萌发无显著差异;种子萌发的适宜温度为25～35℃;种子萌发率随着NaCl浓度的升高而下降;种子萌发的最佳土壤含水量为35%～45%。在最适温度下,种子萌发耐受NaCl的临界值为89.919mmol·L-1,极限值为218.92mmol·L-1;不同温度和NaCl以及二者共同作用使黄顶菊种子萌发受到的抑制都极显著。

The results showed that there was no significant difference between the germination of Flaveria bidentis seeds under light and darkness; the optional temperature for germination was from 25℃ to 35℃. Germination rate of F. bidentis decreased with the increase of NaCl concentration; the optional soil moisture was from 35% to 45% for the germination. Under the optimal temperature, the critical and limited values of NaCl tolerance for the germination were 89.919 and 218.92 mmol·L^-1 respectively. Under different temperatures, different concentrations of NaCl and their combination effect, the inhibition on germination rate of F. bidentis seeds were all notable.