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对蒙古冰草与航道冰草种间杂种F3代的花粉育性、结实性、穗型、细胞遗传学特性等进行了研究,结果表明:F3花粉育性为66.59%,比F1、F2分别提高了39.84%和17.82%;F3自然结实率为28.07%,比F1、F2分别提高了22.77%和12.47%;F3代的穗型变化较F2相对稳定,其PMCMⅠ染色体平均配对构型为0.23Ⅰ+6.88Ⅱ,环状二价体频率明显增加。
The pollen fertility, seed set, cytogenetic characteristics and so on were studied in F2 generation of the hybrids between S. A. and P. A. The results showed that the pollen fertility of F3 was 66.59%, which was higher than that of F1 and F2 39.84% and 17.82% respectively. The natural rate of F3 was 28.07%, which was 22.77% and 12.47% higher than that of F1 and F2 respectively. The change of panicle type in F3 was more stable than that of F2. The average pairing configuration of PMCMⅠ was 0.23Ⅰ + 6.88 Ⅱ, cyclic divalent body frequency increased significantly.