野生二粒小麦（Triticum dicoccoides）幼苗对黄斑病和小麦壳针孢叶斑病的抗性

Seedling Resistance to Tan Spot and Stagonospora nodorum Leaf Blotch in Wild Emmer Wheat (Triticum dicoccoides).

作者信息

Chu C-G, Xu S S, Faris J D, Nevo E, Friesen T L

机构信息

Department of Plant Sciences, North Dakota State University, Fargo, ND 58105, USA.

USDA-ARS, Northern Crop Science Laboratory, Fargo, ND 58105, USA.

出版信息

Plant Dis. 2008 Aug;92(8):1229-1236. doi: 10.1094/PDIS-92-8-1229.

DOI:10.1094/PDIS-92-8-1229

PMID:30769488

Abstract

Tan spot and Stagonospora nodorum blotch (SNB), caused by Pyrenophora tritici-repentis and Stagonospora nodorum, respectively, are two destructive foliar diseases of wheat, causing significant yield reduction worldwide. The objective of this study was to evaluate 172 accessions of wild emmer wheat (Triticum dicoccoides) for seedling resistance to tan spot and SNB. All accessions were inoculated with P. tritici-repentis race 1 and a mixture of three diverse isolates of S. nodorum, respectively. The accessions were also evaluated for sensitivity to host-selective toxins (HSTs), including ToxA produced by both S. nodorum and P. tritici-repentis and culture filtrate produced by S. nodorum. A total of 34 accessions were resistant to tan spot, and 136 accessions were resistant to SNB. Among these accessions, 31 were resistant to both diseases. Significant correlations between HST insensitivity and disease resistance were observed. Our results showed that T. dicoccoides is a good genetic source of resistance to tan spot and SNB in wheat.

摘要

叶斑病和小麦壳针孢叶枯病（SNB）分别由小麦网腥黑粉菌和小麦壳针孢引起，是小麦的两种毁灭性叶部病害，在全球范围内导致显著的产量损失。本研究的目的是评估172份野生二粒小麦（Triticum dicoccoides）材料对叶斑病和SNB的苗期抗性。所有材料分别接种小麦网腥黑粉菌1号小种和三种不同小麦壳针孢分离株的混合物。还评估了这些材料对寄主选择性毒素（HSTs）的敏感性，包括小麦壳针孢和小麦网腥黑粉菌产生的ToxA以及小麦壳针孢产生的培养滤液。共有34份材料对叶斑病具有抗性，136份材料对SNB具有抗性。在这些材料中，31份对两种病害均具有抗性。观察到HST不敏感性与抗病性之间存在显著相关性。我们的结果表明，野生二粒小麦是小麦中对叶斑病和SNB抗性的良好遗传来源。