从商业杂交品种中选择的改良番茄品种中探索Ty耐药性基因和遗传多样性
Ahmed M A Mahmoud1, Ahmed A Hassan2, Khaled E A Abdel-Ati2
1Vegetable Crops Department, Faculty of Agriculture,, Cairo University, Giza, 12613, Egypt. ahmed.ali@agr.cu.edu.eg.
BMC plant biology
|September 23, 2025
概括
繁殖多个耐药基因的西红品种可以增强对西红黄叶卷曲病毒 (TYLCV) 的耐受性. 遗传多样性的分析揭示了在耐药番茄品种中提高产量和水果质量的潜力.
科学领域:
- 植物育种 植物育种
- 遗传学 是一个遗传学.
- 园艺园艺 园艺园艺
背景情况:
- 番茄黄叶卷曲病毒 (TYLCV) 引起的番茄黄叶卷曲病毒 (TYLCD) 严重影响全球番茄产量.
- 开发抗TYLCD的番茄品种对于保持作物产量和质量至关重要.
研究的目的:
- 对与TYLCD耐药性,生长,产量和水果质量相关的27个特征评估17个西红线 (TL).
- 通过表型和基因型变异,遗传性和相关系数来评估这些系内的遗传多样性.
- 确定有前途的品种线和遗传策略,用于培育改进的TYLCD耐受性和高产番茄杂交品种.
主要方法:
- 在自然白介导的TYLCD接种下对17个番茄系进行了表型和基因型评估,持续了两个赛季.
- 分析了27个特征,包括TYLCD耐药性,植物生长,产量和水果质量参数.
- 使用基于PCR的标记物,表型 (PCV) 和基因型 (GCV) 变异系数,遗传性 (h2b),基因型相关性 (rg),主要成分分析 (PCA) 和等级集群分析 (HCA).
主要成果:
- 大多数评估的番茄系 (TLs) 拥有多个同卵性Ty抗性基因,有显著的例外 (TLs 1,3和5).
- 观察到高TYLCD耐受性,其特点是症状严重程度和病毒复制率低,具有显著的表型变异和大多数特征的高遗传性.
- 基因型相关性表明,选择低TYLCD严重性和高产率特征可能会对维生素C和分位数产生负面影响,但会对可销售产量,水果大小和β-胡卜素含量产生积极影响.
- 主要组件和集群分析确定了不同的番茄品种群,特定的集群在关键特征方面表现优越.
结论:
- 商业杂交品种的分离几代可以产生具有多个Ty抗性基因和改进的农学特征的线条.
- 集群内交叉策略有望提高未来F1番茄杂交品种的TYLCD耐受性和产量.
- 需要进行进一步的研究,以阐明TL5等系中TYLCD耐药性的特定遗传机制,该系在没有可检测的Ty基因的情况下表现出高耐受性.
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