Ma Hong-Xiang, Bai Gui-Hua, Gill Bikram S, Hart L Patrick
Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China, and Department of Agronomy, Kansas State University, Manhattan 66506.
Unites States Department of Agriculture-Agricultural Research Service-Plant Science and Entomology Research Unit.
Plant Dis. 2006 Dec;90(12):1545-1549. doi: 10.1094/PD-90-1545.
Fusarium head blight (FHB), caused by Fusarium graminearum Schwabe, is an important disease of wheat worldwide. Production of deoxynivalenol (DON) in infected wheat grain by F. graminearum is a major safety concern when considering use of the grain as feed for livestock or for human consumption. Determining chromosome locations of FHB-related genes may facilitate enhancement of wheat resistance to FHB and DON accumulation. In this study, a set of 30 ditelosomic lines derived from Chinese Spring, a moderately FHB-resistant landrace from China, were evaluated for proportion of scabbed spikelets per inoculated spike in the greenhouse and for DON contamination in harvested grain over 2 years. Significant variation in the proportion of scabbed spikelets was observed among ditelosomic lines, ranging from 13 to 95%. Seven ditelosomic lines exhibited a greater proportion of scabbed spikelets and three of these also had greater DON content than Chinese Spring (P = 0.01), suggesting that those missing chromosome arms may carry genes that contribute to resistance to FHB. Six ditelosomic lines had a reduction in proportion of scabbed spikelets, suggesting that susceptibility factors or resistance suppressors may be on these missing chromosomal arms. Selection for low proportion of scabbed spikelets in general will select for low DON content.
由禾谷镰刀菌（Fusarium graminearum Schwabe）引起的小麦赤霉病是全球小麦的一种重要病害。当考虑将感染的小麦籽粒用作牲畜饲料或人类食用时，禾谷镰刀菌在受感染小麦籽粒中产生脱氧雪腐镰刀菌烯醇（DON）是一个主要的安全问题。确定与小麦赤霉病相关基因的染色体位置可能有助于增强小麦对赤霉病的抗性以及减少DON的积累。在本研究中，对一组源自中国春小麦（一个来自中国的中度抗赤霉病地方品种）的30个端体附加系进行了评估，在温室中测定每个接种穗上的病小穗比例，并在两年内测定收获籽粒中的DON污染情况。在端体附加系中观察到病小穗比例存在显著差异，范围从13%到95%。七个端体附加系表现出更高比例的病小穗，其中三个的DON含量也高于中国春小麦（P = 0.01），这表明那些缺失的染色体臂可能携带有助于抗赤霉病的基因。六个端体附加系的病小穗比例降低，表明感病因子或抗性抑制因子可能存在于这些缺失的染色体臂上。一般来说，选择病小穗比例低的材料也会选择DON含量低的材料。
