Inheritance of adult plant leaf rust resistance in the Brazilian wheat cultivar Toropi
Inheritance of adult plant leaf rust resistance in the Brazilian wheat cultivar Toropi
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DOI：
10.1094/pdis.2000.84.1.90
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发表时间：
2000-01-01
期刊：
影响因子：
4.5
通讯作者：
de Moraes-Fernandes, MIB
中科院分区：
文献类型：
--
作者：
Barcellos, AL;Roelfs, AP;de Moraes-Fernandes, MIB
通过与易感品种 IAC 13 的杂交，研究了巴西小麦品种 Toropi (Triticum aestivum) 成株对叶锈病的抗性。 Toropi 和 IAC 13 在幼苗阶段对小麦叶锈病 LCG-RS 和所有其他已知的巴西叶锈病小种敏感。因此，在田间观察到的托罗皮抗性是由成株植物抗性基因造成的。在温室中的成株阶段，两个互补隐性基因的抗性以 7:9 的比例分离。此外，在温室环境中还发现了两个叶尖坏死的隐性基因。当两个纯合隐性基因同时出现在 Fz 中时，就会表达坏死，与叶锈病的反应无关。小麦中的抗性和叶坏死基因与之前报道的不同。巴西 Passe Fundo 田间的叶锈病抗性分离适合单个隐性基因 1:3 的比例。与不同的病原体种族，以及CV的杂交。在墨西哥的田间检测到了 Toropi 和 ThatcherLr34，两个隐性基因和一个显性抗性基因。显性基因可能是来自 cv. 的 Lr34。 ThatcherLr34 和两个隐性基因很可能是在 Passe Fundo 的温室成年植物测试中检测到的基因。
Adult plant resistance to leaf rust in the Brazilian wheat cultivar Toropi (Triticum aestivum) was studied in crosses with the susceptible cultivar IAC 13. Cvs. Toropi and IAC 13 are susceptible at the seedling stage to race LCG-RS of Puccinia triticina Erikss., and to all other known Brazilian leaf-rust races. Thus, the resistance observed in Toropi in the field was due to adult plant-resistance genes. In the greenhouse at the adult plant stage, resistance segregated in a 7:9 ratio for two complementary recessive genes. Additionally, two recessive genes for leaf-tip necrosis were identified in the greenhouse environment. Necrosis was expressed when the two homozygous recessive genes occurred together in the Fz, independently of the response to leaf rust. The resistance and leaf-necrosis genes differ from those previously reported in wheat. Segregation for leaf-rust resistance in the field at Passe Fundo, Brazil, fit a 1:3 ratio for a single recessive gene. With a different pathogen race, and in crosses of cvs. Toropi and ThatcherLr34, two recessive genes and a dominant gene for resistance were detected in the field in Mexico. The dominant gene was likely Lr34 from cv. ThatcherLr34 and the two recessive genes were likely those detected in the greenhouse adult plants tests at Passe Fundo.