中文摘要：

目的：研究4种甜瓜白粉病抗性品种对白粉病Podosphaera xanthii race 1的遗传规律，对相应抗性基因进行定位。方法：采用，测验法，分析不同分离群体抗、感病植株的分离比，研究其抗性基因的遗传规律。利用BSA（Bulked Segregation Analy-sis）法并结合SSR（Simple Sequence Repeat）分子标记技术，对甜瓜抗性基因进行定位。结果：①抗性亲本PMR45和Km7符合单显性基因的遗传规律（X2=0．133，P=0．72；X2=2．07，P=0．15）。抗性亲本Edist047和红心脆（HXC）均不符合单基因遗传规律，其中Edist047构建的群体符合双基因的遗传规律（r=0．122，P=0．73）。②抗性亲本PMR45和Km7的抗性基因定位于LGⅡ。抗性亲本HXC含有两个抗性基因位点，位于LGV和LGⅫ上。结论：研究了4种白粉病抗性品种所含抗性基因的遗传规律和定位情况，为甜瓜白粉病抗病基因的定位克隆与分子标记辅助育种奠定了基础。

英文摘要：

Objective： Inheritance of 4 sources of Podosphaera xanthii race 1 resistance and location of powdery mildew resistance in melon was studied to explore powdery mildew resistance resources. Method： Inheritance of several resistant sources was observed by analysis of segregation ratios for resistance/susceptibility in different populations. The location of Px race 1 resistance gene was performed by BSA （Bulked Segregation Analysis） and linked SSR （Simple Sequence Repeat） makers technology. Result ：①The segregation ratios for resist- ance/ susceptibility observed in the different populations and the results of the progeny test indicated that resistance to Px race 1 in PMR45 and Km7 were governed by one dominant gene （X2 = 0. 133, P = 0. 72 ;X2 = 2. 07, P = 0. 15 ）. The resistance in Edisto47 and HXC did not fit to one dominant gene segregation ratio, but Edisto47 would in accord with the closest genetic model of two independent genes （g2 = 0. 122,P =0. 73）. ②The powdery mildew resistance in PMR45 and Km7 was located on LG Ⅱ. Two genes were involved in resistance of HXC on LG V and LGⅫ. Conclusion： The genetic analysis and location of four powdery mildew resistance melon cultivars was stud- ied. These results provides a theoretical basis for fine mapping resistance gene and selecting resistance gene in melon breeding.