【摘要】 在两个小麦杂种材料的活体花药中,发现相当数量的不正常花粉,频率分别为2.61%和6.81%。这表明在小麦的活体花药中也存在花粉二型性现象。对活体花药中不正常花粉的发育和花药培养中花粉胚形成的早期阶段进行了细胞学对比研究,结果表明,此二者在细胞学上具有明显的一致性。因此在小麦中也如同在其他植物中一样,花粉胚可能起源于不正常花粉。作者认为活体中不正常花粉的出现和频率可能表示植物小孢子发育对内外各种因素变化的敏感性。讨论了这种敏感性对于小麦花药培养中花粉胚形成的意义。更多还原

【Abstract】 The anomalous pollen grains in vivo at the frequencies of 2.61% and 6.81% respectively were found in anthers of two hybrid materials of wheat from which we had obtained the higher frequencies of induction of pollen embryos in anther culture in.the past few years.This indicated that the pollen dimorphism also presented itself in the anthers on wheat plants.A comparative cytological study of develop- ment of anomalous pollen grains in vivo and of the early stages of the formation of pollen embryos in vitro was carried out and the results suggest that in cytological details there is an obvious similarity between them.This reveals the possibility that the pollen embryos night derive itself from the anomalous pollen grains in wheat as in the other plants.Therefore,it was considered that the appearance and frequency of the anomalous pollen grains could show the sensibility of the development of microspores to the changes of various internal and external factors.The significance of the sensibility for the formation of pollen embryos in anther culture of wheat is discussed.更多还原