中国农业科学 ›› 2020, Vol. 53 ›› Issue (9): 1806-1819.doi: 10.3864/j.issn.0578-1752.2020.09.009

• 植物保护 • 上一篇    下一篇

基于亲本对条锈病敏感性预测小麦杂交种的抗性

周天宇1,李姜玲1,杨澜1,阮仁武2,杨宇衡3(),李中安1()   

  1. 1 西南大学柑桔研究所,重庆 400712;
    2 西南大学农业与生物技术学院,重庆 400716;
    3 西南大学植物保护学院,重庆 400716
  • 收稿日期:2019-12-17 接受日期:2020-02-12 出版日期:2020-05-01 发布日期:2020-05-13
  • 通讯作者: 杨宇衡,李中安
  • 作者简介:周天宇,E-mail:1522619059@qq.com。
  • 基金资助:
    国家重点研发计划(2016YFD0101603);国家重点研发计划(2018YFD0200500);国家自然科学基金(31801719)

The Resistance Prediction of Wheat Hybrids Based on the Sensibility of Their Parents to Stripe Rust

TianYu ZHOU1,JiangLing LI1,Lan YANG1,RenWu RUAN2,YuHeng YANG3(),ZhongAn LI1()   

  1. 1 Citrus Research Institute, Southwest University, Chongqing 400712;
    2 College of Agronomy and Biotechnology, Southwest University, Chongqing 400716;
    3 College of Plant Protection, Southwest University, Chongqing 400716
  • Received:2019-12-17 Accepted:2020-02-12 Online:2020-05-01 Published:2020-05-13
  • Contact: YuHeng YANG,ZhongAn LI

摘要:

【目的】通过亲本条锈病的抗性评价预测F1代杂交种的抗病性,增强杂交小麦抗病育种的可预见性。【方法】以CYR23、CYR31、CYR33、CYR34 4个小麦条锈菌(Puccinia striiformis f. sp. tritici)生理小种作为供试菌源,感病小麦品种铭贤169作为阴性对照,通过成株期混合接种,对13份恢复系(父本)材料和21份不育系(母本)材料及其F1代杂交种进行抗病性鉴定,并利用Yr5Yr9Yr10Yr15Yr17Yr18Yr26等抗条锈基因的分子标记或基因标记对其可能携带的抗条锈基因进行分子检测。同时通过半定量PCR方法在亲本及部分F1代植株的成株期进行条锈菌侵染量测定。【结果】所有材料均未鉴定到Yr5Yr10Yr15,Yr26多存在于四川品系,Yr9Yr17多存在于北方品系,本研究所有恢复系材料均未鉴定到Yr18。亲本抗条锈基因在F1代杂交种得到了聚合,符合遗传规律,表明分子标记可以用于杂交小麦抗病辅助选育。来自四川的恢复系及其F1代杂交种整体表现优良抗性,推测其具有纯合显性的抗条锈基因,同时,这些小麦材料可以用于我国小麦抗条锈育种。F1代的实际鉴定反应型趋于亲本反应型的平均值,二元回归分析结果表明亲本和F1代的反应型之间有显著相关性(R2=0.812)。来自四川的恢复系及其F1代对新毒性小种CYR34表现优良抗性,但亲本中未检测到Yr5Yr15,推测其可能含有未知的抗条锈病基因。利用半定量PCR方法对所有恢复系、不育系和部分F1代杂交种分别进行了供试条锈菌生理小种的菌量测定,结果显示所有亲本及其杂种中均未检测到CYR23,恢复系15CA50、不育系17L6078和15L7128有少量CYR31侵染,恢复系川13品6、MR1101和川麦98及其F1代杂交种未检测到CYR33、CYR34。同时发现,对不同生理小种抗性互补的亲本能有效提高F1代的抗病性。【结论】根据双亲对条锈病的反应型可以预测其F1代杂交种的抗性水平,双亲的抗病水平越高,其F1代杂交种的抗性就越好。同时可以选用具有不同条锈病生理小种抗性互补的亲本来提高F1代杂交种的抗性水平。研究结果有助于探究亲本与F1代杂交种之间的抗病规律,同时为杂交小麦抗病育种提供可参考的实践方案。

关键词: 杂交小麦, 条锈病, 抗性预测, 小麦条锈菌, 生理小种

Abstract:

【Objective】The objective of this study is to predict the resistance of wheat hybrids based on the resistance evaluation of their parental lines to stripe rust, and to enhance the predictability of disease resistance breeding in hybrid wheat. 【Method】A sensitive wheat variety, Mingxian 169, was used as negative control. A total of 13 restorer lines (male parents), 21 sterile lines (female parents), and their F1 hybrids were inoculated with a suspension of a mixture of fresh urediniospores (equal amounts of stripe rust pathogen physiological races CYR23, CYR31, CYR33, and CYR34) in the field. Stripe rust resistance genes Yr5, Yr9, Yr10, Yr15, Yr17, Yr18 and Yr26 were identified by PCR using their gene or linked molecular markers. In addition, semi-quantitative PCR was used to quantify the different stripe rust races in the adult plants of parent lines and a part of F1 hybrids. 【Result】Yr5, Yr10 and Yr15 were not identified in all materials, Yr26 was mostly existed in Sichuan wheat lines, Yr9 and Yr17 were mostly existed in the northern lines, Yr18 was not identified in restorer lines. The parental resistance genes were polymerized in F1 hybrids, which is consistent with the genetic law, indicating that the molecular marker can be used in wheat assistant breeding. The restorer lines from Sichuan and their F1 hybrids showed high resistance against stripe rust, speculating that there are homozygous dominant resistance genes against stripe rust. Meanwhile, these wheat lines can be used for stripe rust resistance breeding in China. The infection types (ITs) of F1 hybrids tended to the average of parental infection types. The results of binary regression analysis showed a significant correlation between parent lines and F1 hybrids in ITs (R2=0.812). Although Yr5 and Yr15 resistance genes were absent in all tested wheat lines, the restorers from Sichuan Province and their F1 hybrids showed higher resistance, speculating that those lines might carry unknown resistance genes against CYR34. The semi-quantitative PCR results indicated that CYR23 was not detected in all wheat lines. Only the restorer line 15CA50, sterile lines 17L6078 and 15L7128 were infected with a small amount of CYR31. The tested restorer lines Chuan 13 pin 6, MR1101, Chuanmai 98 and their F1 hybrids were not infected by CYR33 or CYR34. Meanwhile, the parents with complementary resistance to different races were found to increase the resistance level of F1 hybrids effectively. 【Conclusion】The F1 hybrids resistance to strip rust can be predicted according to the average of the ITs of parental lines, the higher levels of disease resistance of parents, the better resistance of F1 hybrids. Wheat varieties or lines with complementary resistance to different races of stripe rust should be screened as parents to improve the resistance level of F1 hybrids. The results revealed the rule of disease resistance between parents and their F1 hybrids, as well as providing a practical strategy for hybrid wheat disease resistance breeding.

Key words: hybrid wheat, stripe rust, resistance prediction, Puccinia striiformis f. sp. tritici, physiological race