<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jönsson, Ulrika</style></author><author><style face="normal" font="default" size="100%">Thomas Jung</style></author><author><style face="normal" font="default" size="100%">Rosengren, Ulrika</style></author><author><style face="normal" font="default" size="100%">Nihlgård, Bengt</style></author><author><style face="normal" font="default" size="100%">Sonesson, Kerstin</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Pathogenicity of Swedish isolates of Phytophthora quercina to Quercus robur in two different soils</style></title><secondary-title><style face="normal" font="default" size="100%">New Phytologist</style></secondary-title><short-title><style face="normal" font="default" size="100%">New Phytol</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2003</style></year><pub-dates><date><style  face="normal" font="default" size="100%">05/2003</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">158</style></volume><pages><style face="normal" font="default" size="100%">355 - 364</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;div class=&quot;para&quot;&gt;&lt;ul class=&quot;custom&quot;&gt;&lt;li&gt;&lt;div class=&quot;text&quot;&gt;Several studies have demonstrated the involvement of soil-borne &lt;em&gt;Phytophthora&lt;/em&gt; species, especially &lt;em&gt;Phytophthora quercina&lt;/em&gt;, in European oak decline. However, knowledge about the pathogenicity of &lt;em&gt;P. quercina&lt;/em&gt; in natural forest soils is limited.&lt;/div&gt;&lt;/li&gt;&lt;li&gt;&lt;div class=&quot;text&quot;&gt;The short-term effects of two south-Swedish isolates of &lt;em&gt;P. quercina&lt;/em&gt; on root vitality of &lt;em&gt;Quercus robur&lt;/em&gt; seedlings grown in two different soils, one high pH, nutrient-rich peat–sand mixture and one acid, nitrogen-rich but otherwise nutrient-poor forest soil are described. Pathogenicity of &lt;em&gt;P. quercina&lt;/em&gt; was tested using a soil infestation method under a restricted mesic water regime without prolonged flooding of the seedlings.&lt;/div&gt;&lt;/li&gt;&lt;li&gt;&lt;div class=&quot;text&quot;&gt;There was a significant difference in dead fine-root length between control seedlings and seedlings grown in soil infested with &lt;em&gt;P. quercina&lt;/em&gt;. Trends were similar for both soil types and isolates, but there was a higher percentage of fine-root die-back and more severe damage on coarse roots in the acid forest soil. No effects on above-ground growth or leaf nutrient concentration between control seedlings and infected seedlings were found.&lt;/div&gt;&lt;/li&gt;&lt;li&gt;&lt;div class=&quot;text&quot;&gt;The results confirm the pathogenicity of south-Swedish isolates of &lt;em&gt;P. quercina&lt;/em&gt; in acid forest soils under restricted water availability. Stress-induced susceptibility of the seedlings and/or increased aggressiveness of the pathogen in the forest soil are discussed as key factors to explain the difference in root die-back between soil types.&lt;/div&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue></record></records></xml>