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以不同水分含量的玉米杂交种富农1号、郑单958和辽单565的成熟鲜果穗为试验材料,通过0℃、-5℃、-10℃、-15℃、-20℃和-25℃低温处理12 h,研究不同处理下不同品种的萌发特性。结果表明,当种子水分含量低于15%时,低温冻害对种子的萌发活力影响不明显;当水分含量处于15%～25%之间、温度低于-20℃时,发芽势、发芽率和发芽指数下降明显;当水分含量处于25%～30%之间、温度低于-15℃时,会明显影响发芽势、发芽率和发芽指数。同一水分下,温度低于-20℃时,郑单958和辽单565的发芽势、发芽率和发芽指数下降幅度最大,富农1号下降幅度远小于前两者;当温度降至-25℃时,3个品种的发芽势、发芽率和发芽指数都降到了最低值。
The fresh ear of mature hybrids Fennong 1, Zhengdan 958 and Liao Dang 565 with different water content were used as experimental materials, and were tested by 0 ℃, -5 ℃, -10 ℃, -15 ℃, -20 ℃ and -25 ℃ After 12 h of low temperature treatment, the germination characteristics of different varieties under different treatments were studied. The results showed that when the moisture content of seed was less than 15%, the effect of cold damage on seed germination was insignificant. When the moisture content was between 15% and 25% and the temperature was below -20 ℃, the germination rate, The germination index decreased significantly. When the moisture content was between 25% and 30%, the germination potential, germination rate and germination index were significantly affected when the temperature was below -15 ℃. Under the same water temperature, the germination potential, germination rate and germination index of Zhengdan 958 and Liao Dang 565 decreased most significantly when the temperature was lower than -20 ℃, and the decline rate of Phu Nong 1 was much less than that of the former two. When the temperature dropped to -25 ℃ When the three varieties of germination potential, germination rate and germination index dropped to a minimum.