【摘要】 对泡桐属10个种、22个种间杂种、496个无性系的4085株树木进行了连续7年的研究,找出了泡桐对丛枝病存在的抗性差异:在5年生以前,发病率和感病指数与年龄呈正相关,6年生以后呈负相关。根据3—4年生感病发病高峰期与第5年存在着显著相关关系,提出了利用发病率作指标,对抗病材料进行早期选择的自然鉴定方法,为开展泡桐抗丛枝病育种提供了依据。更多还原

【Abstract】 According to the 7—years continuous rasearch on 4085 trees of 496 clones of10 species and 22 interspeeific hybrids of paulownia,witches′ broom resisantdifferences of paulownia have been found.It shows a law that before 5-years old,morbidity and witches′ broom index hare a positive correlation with age,andaftor 6-years old,hare a regative correlation With it.According to thesignifica-nt correlation between witches′ broom morbid condition at 3—4 years old andthe period of maximun at 5 years old,and using morbidity as a index,naturalappraisal method of early selection to witches′ broom resistance has been putforward according to 3—4 years old sapling witches′ broom morbid condition.It afford a basis for the anti—witches′ —broom breeding.更多还原