【摘要】 研究了小麦×天蓝冰草(Agropyron glaucum)后代五个中间类型的根端细胞染色体数和花粉母细胞染色体构型。每个中间类型的体细胞染色体数皆为28对(2n=56),而减数分裂终变期或中期Ⅰ的花粉母细胞具有28个二价体。大多数花粉母细胞减数分裂过程是正常的。只在少数花粉母细胞中看到后期Ⅰ或末期Ⅰ有落后染色体和断片。作者从观察得出结论,小麦×天蓝冰草后代这五个中间类型都是异源八倍体。对这些异源八倍体的利用作了简短讨论。更多还原

【Abstract】 A stuty has been made of the chromosome number of root-tip cells and the chro- mosome configuration of PMCs in five intermediate forms of progeny of Triticum aes- tivum×Agropyron glaucum.The somatic cells in each of these intermediate forms have 28 pairs of chromosomes(2n=56)and the PMCs at diakinesis or metaphase Ⅰ of meiosis have 28 bivalents.The process of meiosis in most PMCs is regular.Lag- ging chromosomes and fragments at anaphase Ⅰ or telophase Ⅰ were observed only in few PWCs.According to our results,all the five intermediate forms of progeny of T.aestivum×Ag.glaucum are allooctoploids.The application of these allooctoploids is also briefly discussed. Explanation of plates 1.Ears of the 5 intermediate forms of progeny of T.aestivum×Ag.glaucum:from left to right—No1.No2.No3.No4.and No5.2.PMC of.intermediate form No2 at diakinesis.×1028 3. PMCs of intermediate form No4:3 normal telophase 1 and 1 abnormal telophase 1 with Chromosome fragments.×665 4.mitotic chromosomes of intermediate form No 1,2n=56×1014 5.mitotic chromosomes of intermediate form No 3,2n=56×1014 6.mitotic chromosomes of intermediate form No 1,2n=56.×688 7.mitotic chromosomes of intermediate from No 2,2n=56.×688 8. mitotic chromosomes of intermediate form No 5,2n=56.×688 9.mitotic chromosomes of inter- medate form No 4,2n=56.×688更多还原