Dollar spot resistance among blends of creeping bentgrass cultivars
Dollar spot resistance among blends of creeping bentgrass cultivars
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匍匐翦股颖品种混合物中的美元点抗性
DOI：
10.2135/cropsci2001.413806x
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. C. Hale
中科院分区：
文献类型：
--
作者：
S. Abernathy;R. White;P. Colbaugh;M. C. Engelke;G. R. Taylor;T. C. Hale
病害是困扰匍匐折枝草的主要问题之一。在高尔夫球场上打果岭。宿主群体的遗传组成和一致性会影响疾病的发展。本研究旨在探讨不同杂草品种对腐烂病(由菌核病引起)的防治效果。‘Penn A-4’、‘Crenshaw’、‘L-93’、‘Mariner’和‘Penncross’在德克萨斯州College Station的沙地果岭上以完全随机的设计种植，或以双向或三向混合种植。疾病的严重程度由感染中心的数量和总的受害面积决定。克伦肖为感病品种，L-93为抗病品种，其余品种均为中抗品种。单株品种对高果黑粉病的敏感性代表了各品种对混交种黑斑病严重程度的贡献。在混合葡萄酒中，L-93受到抑制，而克伦肖则增加了美元现货。彭克罗斯、宾夕法尼亚A-4和水手没有影响所有混合组合的美元现货严重程度。与双向和三向杂交相比，所有单株的侵染中心数和侵染面积相似，表明杂交种中的美元斑点活性是单个品种抗性水平之间的折衷。然而，与克伦肖单株相比，宾夕法尼亚A-4、L-93、水手或彭克罗斯与克伦肖的双向混合导致感染中心减少46%至67%，疫病面积减少71%至98%。这些数据表明，将抗病品种与感病品种混合，可降低混合群体中美元斑点病的严重程度。
Disease is a major problem in creeping bentgrass (Agrostis stolonifera L.) on golf course putting greens. Genetic composition and uniformity of host populations can affect disease development. This study was conducted to determine the effects of blending creeping bentgrass cultivars on dollar spot (caused by Sclerotinia homoeocarpa F. T. Bennett) severity. 'Penn A-4', 'Crenshaw', 'L-93', 'Mariner', and 'Penncross' were planted in monostands or as two-way or three-way blends in a completely random design with three replications on a sand-based putting green in the field at College Station, TX. Disease severity was determined by the number of infection centers and by total blighted area. Crenshaw was most susceptible, L-93 most resistant, and all other cultivars were moderately resistant to dollar spot in monostands. Cultivar susceptibility in monostands to S. homoeocarpa was representative of each cultivars contribution to dollar spot severity in blends. In blends, L-93 suppressed, whereas Crenshaw increased dollar spot. Penncross, Penn A-4, and Mariner did not affect dollar spot severity across all blend combinations. Number of infection centers and infected area pooled across all monostands were similar when compared to all two- and three-way blends indicating that dollar spot activity in blends was a compromise between resistance levels of individual cultivars. Two-way blends of Penn A-4, L-93, Mariner, or Penncross with Crenshaw, however, resulted in 46 to 67% fewer infection centers and 71 to 98% less blighted area, when compared to the Crenshaw monostand. These data indicated that blending a resistant cultivar with a susceptible cultivar reduced dollar spot severity in the blended population.