番茄抗TYLCV分子标记辅助聚合育种
2019-05-13侯富恩郝科星张涛苏东涛王铭
侯富恩 郝科星 张涛 苏东涛 王铭
摘 要: 为了培育对TYLCV(Tomato yellow leaf curl virus)抗性稳定持久、园艺性状优良的番茄品种,以分别含有Ty-1、Ty-2、Ty-3的3个抗源材料‘TY52‘CLN2777A‘R1164为供体亲本,2个园艺性状优良的不含抗病基因的育种材料‘TMX255-1‘TMX255-5为受体亲本,通过杂交和多代回交自交,同时利用分子标记辅助选择技术、苗期接种技术和农艺性状观察对后代进行筛选,将Ty-1与Ty-2导入并聚合到‘TMX255-1,Ty-1与Ty-3导入并聚合到‘TMX255-5,最终获得2份聚合了不同抗病基因的株系,分别命名为‘TY1-2‘TY1-3,并对其进行了抗性评价,结果显示,2份株系对TYLCV整个生育期在田间都表现抗病,且园艺性状优良稳定,可以作为自交系应用于抗病育种中。
关键词: 番茄; TYLCV; 分子标记; 聚合育种
Abstracts: In order to breed tomato varieties with excellent resistance to TYLCV (Tomato yellow leaf curl virus) and good horticultural traits, two TYLCV susceptible tomato lines ‘TMX255-1,‘TMX255-5 were used as recipient parents to cross and backcross with the three donor parents ‘TY52,‘CLN2777A,‘R1164,which contained Ty-1,Ty-2,Ty-3,respectively. Molecular marker-assisted selection(MAS), seedling inoculation identification and observation of agriculture characters were used in each backcross and self-cross progeny selection, and two pyramided lines were obtained which named ‘TY1-2 and ‘TY1-3. The evaluation of resistence level of two pyramided lines showed that the pyramided lines which carried both resistance genes were resistant to tomato leaf curl disease throughout its life cycle in the field and exhibited excellent horticultural traits. So the lines could be used as inbred lines in resistance breeding.
Key words: Tomato; TYLCV(Tomato yellow leaf curl virus); Molecular marker; Pyramid
番茄黃化曲叶病(Tomato yellow leaf curl disease,TYLCD)是目前我国番茄生产上的重要病害之一,植株感病后会表现出叶片卷曲、黄化、生长停滞等现象,严重时会导致大面积绝收[1-6]。导致该病发生的病原为番茄黄化曲叶病毒(Tomato yellow leaf curl virus,TYLCV),该病毒属于双生病毒科(Geminiviridae)菜豆金色花叶病毒属(Begomovirus),是一类具有孪生颗粒形态的单链环状DNA植物病毒,其基因组重组发生率和变异频率较高[7]。利用分子标记辅助选择技术聚合多个抗TYLCV基因,是培育具有持久抗性品种最有效的策略[8]。因此,笔者结合苗期接种鉴定、分子标记辅助选择和田间性状观察,初步研究番茄不同抗TYLCV基因聚合后抗性表现的差异,建立番茄抗TYLCV聚合育种的分子标记辅助选择体系,以获得抗性高且不再分离同时性状优良的自交系,为番茄优质、抗病育种创制新的种质资源。
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