分子标记辅助聚合番茄抗病自交系的选育
Molecular marker-assisted breeding of tomato resistant inbred lines
目的 将不同的抗病基因聚合到一个材料中,筛选具有综合抗病性强的番茄自交系。 方法 利用分子标记辅助选择技术,将抗番茄黄化曲叶病毒病基因Ty-1、抗烟草花叶病毒基因Tm-2a 、抗叶霉病基因Cf-9、抗枯萎病基因I-2聚合到同一个材料中,对同时含有4种抗病基因的番茄自交系进行室内接种鉴定,并比较分析田间主要农艺性状。 结果 6个自交系J3、J9、J14、J29、J36、J41同时聚合了Ty-1、Tm-2a 、Cf-9、I-2等4个抗病基因,室内抗病接种鉴定其抗性水平均达到抗病(R)及以上,J14单果质量220 g,果实硬度10.2 Ka/cm2,坐果率78.5%,单株产量3.5 kg;J41,单果质量235 g,果实硬度10.5 Ka/cm2,坐果率73.4%,单株产量3.8 kg,各农艺性状显著优于对照华番11。 结论 通过分子标记辅助选择得到的6个番茄自交系同时含有4种抗病基因,田间农艺性状表现优良,可作为抗病自交系进行育种。
Objective This study aimed to aggregate different resistance genes into a single material for the purpose of screening tomato inbred lines with comprehensive resistance. Method The molecular marker-assisted selection technique was employed to combine the anti-tomato yellow leaf bending virus disease gene Ty-1,anti-tobacco mosaic virus gene Tm-2a,anti-leaf mildew gene Cf-9,and anti-fusarium wilt gene I-2 into the same material.The tomato inbred lines containing all four resistance genes were inoculated and identified in the laboratory,and their main agronomic traits were compared and analyzed. Result The results revealed that six inbred lines (J3,J9,J14,J29,J36 and J41) successfully integrated Ty-1,Tm-2a,Cf-9 and I-2 resistance genes.J14 exhibited resistance levels of R or above,with a single fruit weight of 220 g and a fruit hardness of 10.2 Ka/cm2.It demonstrated a fruit setting rate of 78.5% and a yield per plant of 3.5 kg.Similarly,J41 displayed a single fruit weight of 235 g,fruit hardness of 10.5 Ka/cm2,fruit setting rate of 73.4%,and yield per plant of 3.8 kg.The agronomic characteristics of J41 were significantly superior to those of the control variety Huafan 11. Conclusion In conclusion,the six tomato inbred lines obtained through molecular marker-assisted selection contain all four disease resistance genes simultaneously and exhibit favorable agronomic traits in the field.These lines can serve as valuable resources for breeding disease-resistant tomato varieties.
tomato / molecular marker / disease resistance / inbred lines / breeding
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