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围绕银白杨、白榆、新疆杨以及银榆杨(银白杨×白榆)这四个树种进行了远缘杂交试验。结果表明:通过花粉蒙导与未成熟胚离体培养技术,克服了科间远缘杂交障碍,获得了银白杨×白榆杂种苗。此外,银白杨×银榆杨、银白杨×新疆杨都得到了种子。银白杨×新疆杨效果较好,银白杨×银榆杨试验所得的成熟种子比较少,只占所得种子总数的25%,且成熟种子的发芽率为66.7%。由于银白杨×银榆杨的杂种苗生长羸弱,没能存活下来。这表明银榆杨花粉可育,只是育性差。形态学标记和AFLP标记结果表明,银榆杨属于偏母本融合型的杂种。银榆杨雌雄同株,且有同花序现象,在早花性、叶背面无毛、侧枝细弱,从这些性状上看,白榆的基因在银榆杨中得到了表达。
The distant hybridization experiments were carried out around four species of Populus alba, Ulmus pumila, Xinjiang poplar and Yin yin yang (Populus tomentosa × Ulmus pumila). The results showed that the hybridization between pollen and immature embryos was overcome by the technique of pollen monolayer and immature embryo culture. In addition, the poplar × silver Yu Yang, Populus × Xinjiang Yang have been the seeds. Poplar × Populus × euphratica had better effect, and the poplar × Populus euphratica had less mature seeds, accounting for 25% of the total number of seeds, and the germination rate of mature seeds was 66.7%. Because the poplar × silver Yu Yang hybrid seedlings grow weak, did not survive. This shows that silver elm Yang pollen fertile, but poor fertility. Morphological markers and AFLP markers showed that P. yunnanensis was a hybrid of partial parental hybrids. Yin yin Yang female and male plants, and the same inflorescence phenomenon, at early flowering, leaf hairless glabrous, collateral weak, from these traits point of view, the elm gene was expressed in the Yin Yu.