ZHANG Yuanqiu,LUO Qinfen,ZHAO Jixin,et al.Construction of the Near-isogenic Line and Disease Resistance Analysis of the Powdery Mildew Resistance Locus CpPM10.1 in Cucurbita pepo[J].Northern Horticulture,2026,(8):88-96.[doi:10.11937/bfyy.20253820]
美洲南瓜白粉病抗性位点CpPM10.1近等基因系构建及抗病性分析
- Title:
- Construction of the Near-isogenic Line and Disease Resistance Analysis of the Powdery Mildew Resistance Locus CpPM10.1 in Cucurbita pepo
- 文章编号:
- 1001-0009(2026)08-0088-09
- Keywords:
- Cucurbita pepo; near-isogenic line; powdery mildew resistance; disease resistance analysis
- 分类号:
- S642.1
- 文献标志码:
- A
- 摘要:
- 以美洲南瓜白粉病高抗自交系‘X10’为供体亲本试材,以高感自交系‘JIN234’为轮回亲本试材,采用前景和背景选择结合多代回交的方法构建了白粉病抗性位点CpPM10.1近等基因系‘NIL-PM10.1’,研究了位点CpPM10.1对白粉病抗性的影响,以期为南瓜白粉病抗性育种提供参考依据。结果表明:以CpPM10.1紧密连锁分子标记为前景选择标记,以210个多态性好、在美洲南瓜20条染色体均匀分布的分子标记为背景选择标记,检测到抗性位点CpPM10.1已导入近等基因系‘NIL-PM10.1’中,且‘NIL-PM10.1’的背景恢复率达99.52%。接种白粉菌后,‘NIL-PM10.1’叶片分生孢子的萌发时间比‘JIN234’延迟了,且孢子产生少,菌丝伸长扩增速度明显减缓;接菌7 d后‘NIL-PM10.1’的病情指数显著低于‘JIN234’。在侵染关键时期,‘NIL-PM10.1’的CAT、SOD、POD活性显著高于‘JIN234’,H2O2含量始终低于‘JIN234’。
- Abstract:
- The Cucurbita pepo of powdery mildew (PM) high-resistance inbred line ‘X10’ was used as the donor parent material,and the Cucurbita pepo of PM high-susceptibility inbred line ‘JIN234’ was used as the recurrent parent material.The near-isogenic line of PM resistance locus CpPM10.1,‘NIL-PM10.1’,was constructed by using the method of foreground and background selection combined with multi-generation backcrossing.The influence of locus CpPM10.1 on PM resistance was studied,in order to provide reference for PM resistance breeding in Cucurbita pepo.The results showed that markers closely linked to CpPM10.1 locus as the foreground selection markers and 210 markers with good polymorphism and uniform distribution on 20 chromosomes as the background selection markers,and resistance locus CpPM10.1 was detected to be transferred into the near-isogenic line ‘NIL-PM10.1’ with a background recovery rate of 99.52%.Compared with ‘JIN234’,the conidia germination on the leaves of ‘NIL-PM10.1’ was delayed after PM inoculation,spore production of ‘NIL-PM10.1’ was few,and the growth and expansion speed of hyphal in ‘NIL-PM10.1’ were significantly slowed down.Moreover,the disease index of ‘NIL-PM10.1’ was significantly lower than that of ‘JIN234’ at 7 days after PM inoculation.During the critical period of PM infection,the CAT,SOD and POD activities of ‘NIL-PM10.1’ were significantly higher than those of ‘JIN234’,and the H2O2 content of ‘NIL-PM10.1’ was significantly lower than that of ‘JIN234’.
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备注/Memo
第一作者简介:张缘秋(2000-),女,硕士研究生,研究方向为南瓜分子育种。E-mail:2635171056@qq.com.责任作者:王云莉 (1985-),女,博士,副教授,现主要从事南瓜分子育种等研究工作。E-mail:wangyunli@neau.edu.cn.基金项目:黑龙江省重点研发计划资助项目(GA23B007);国家自然青年科学基金资助项目(32002051)。收稿日期:2025-11-05