在热带玉米杂交系中遗传对玉米致命亡的耐药性
Hilda M Kavai1,2, Dan Makumbi1, Felister M Nzuve2
1International Maize and Wheat Improvement Center (CIMMYT), Nairobi, Kenya.
Frontiers in plant science
|January 24, 2025
概括
改善撒哈拉以南非洲的玉米产量需要对抗玉米致命死 (MLN) 的混合物. 这项研究确定了对MLN耐药性的强增基因效应的近亲系,这对育种计划至关重要.
科学领域:
- 植物育种 植物育种
- 遗传学 遗传学 是一个
- 农业学是一种农业学.
背景情况:
- 玉米致命亡 (MLN) 在撒哈拉以南非洲显著降低了作物产量.
- 开发耐药的玉米杂交品种对于该地区的粮食安全至关重要.
研究的目的:
- 评估热带玉米杂交系中MLN耐药性和农学特征的结合能力,互惠效应和遗传基础.
- 确定优秀的杂交品种,用于培育耐MLN的玉米杂交品种.
主要方法:
- 在肯尼亚,在人工MLN接种和雨水条件下评估了一种产生182个杂交的14个父母拨号交叉.
- 分析采用了Griffing的方法3和Hayman的拨号模型来估计遗传参数.
- 测量的特征包括疾病严重程度,谷物产量和其他农业学特征在三年内.
主要成果:
- 在MLN耐药性和农业特征方面发现了显著的添加剂 (GCA) 和非添加剂 (SCA) 遗传效应.
- 添加基因作用占主导地位,对MLN耐药性的高狭义遗传性 (0.52-0.56).
- 四个杂交系表现出对MLN耐药性显著的负GCA和对谷物产量的积极GCA.
结论:
- 专注于一般组合能力 (GCA) 的育种策略对于提高玉米MLN耐药性是有效的.
- 杂交品种CKL181281和CKL182037具有有利于MLN耐药性的等位基因.
- 最小的相互效应表明对MLN耐药性的母体或细胞质影响有限.
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