外源激素与温度对花楸树种子萌发的影响

三种外源激素和萌发温度对花楸树种子萌发影响的研究结果表明，25℃（16h光／8h暗，10d）-5℃（暗110d）变温可极显著提高种子发芽率和种子发芽势，但极显著延迟发芽初始时间。200mg·L^-16-BA溶液中吸胀2d后经历25℃·5℃变温可使种子发芽初始时间最短（33d），发芽率（62．25％）和发芽势（57．88％）最高。GA3或ABA与温度的结合处理对种子萌发的促进作用小于6-BA与温度的综合处理。

Effects of Exogenous Plant Growth Substances and Temperature on Seed Germination of Sorbus pohuashanensis （Hance） Hedl

Effects of three exogenous plant growth substances and temperatures on the germination of mature Sorbus pohuashanensis seeds were investigated. When seeds were treated first with 25 ℃ （16 hours light/8 hours dark） for 10 days and then with 5 ℃ （24 hours dark） for 110 days （25 ℃-5 ℃ temperature change）, their germination percentage and germination energy increased significantly, but the initial time of seed germination was delayed significantly. When seeds were treated with 200 mg-L-16-BA for 2 d and then treated with the 25 ℃-5 ℃ temperature change, the initial time of seed germination could be shortened to 33 days, and the highest germination percentage （62.25%） and germination energy （57.88%） were obtained. The effects of combined treatments of GA3 or ABA with temperature on seed germination were less than that of combined treatment of 6- BA with temperature.