Involvement of Phytophthora species in white oak (Quercus alba) decline in southern Ohio
Involvement of Phytophthora species in white oak (Quercus alba) decline in southern Ohio
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DOI：
10.1111/j.1439-0329.2009.00617.x
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发表时间：
2010-10-01
期刊：
影响因子：
1.4
通讯作者：
MacDonald, W. L.
中科院分区：
文献类型：
--
作者：
Balci, Y.;Long, R. P.;MacDonald, W. L.
本研究旨在探讨疫霉菌在俄亥俄州南部Scioto Trail州立森林白色栎衰退中的可能作用。调查表明存在四种疫霉属，包括一个新种。到目前为止，最常见的物种是P. cinnamomi; P. citricola和P. cambivora很少分离。在少数情况下，P. cinnamomi分离自细根和较大根上的坏死物。没有发现特殊的发病模式，但P. cinnamomi更常见的是从更大的综合水分指数值，这表明潮湿的较低的洼地有利于疫霉属物种。当检查树冠状况与疫霉的存在时，没有发现显著的关联。然而，衰退的肉桂疫霉感染的树木的根比未感染和健康的树木的细根少2.5倍，这是显著差异的。来自衰退树的P. cinnamomi的种群密度显著大于来自健康树的，这表明病原体活性增加，有可能导致枯死和衰退，并且可能是在衰退树上发现的细根量减少的原因。
P>This study was initiated to investigate the possible role of Phytophthora species in white oak decline (Quercus alba) in southern Ohio at Scioto Trail State Forest. Surveys demonstrated the presence of four species of Phytophthora including one novel species. By far, the most common species was P. cinnamomi; P. citricola and P. cambivora were isolated infrequently. In few instances, P. cinnamomi was isolated from fine roots and necroses on larger roots. No special pattern of incidence was found, but P. cinnamomi was more commonly isolated from greater Integrated Moisture Index values suggesting moist lower bottomlands favour this Phytophthora species. When tree crown condition was examined relative to the presence of Phytophthora, no significant association was found. However, roots of declining P. cinnamomi-infested trees had 2.5 times less fine roots than non-infested and healthy trees, which was significantly different. The population densities of P. cinnamomi from declining trees were significantly greater than from healthy trees, suggesting increased pathogen activity that has the potential to cause dieback and decline and possibly the cause of a reduced fine root amount found on declining trees.