Kotcon J B, Loria R
J Nematol. 1986 Jul;18(3):385-91.
Plants of potato (Solanum tuberosum) cultivars Katahdin and Superior were inoculated with 0, 1,500, or 15,000 Pratylenchus penetrans. Transpiration, measured in the greenhouse with a porometer after 56 days of growth, was not significantly different among nematode inoculum levels or between cultivars. The rate of xylem exudation from decapitated root systems of Katahdin plants inoculated with 1,500 or 15,000 P. penetrans and Superior plants inoculated with 15,000 P. penetrans was lower than from noninoculated plants. Root weight of Katahdin and Superior was not affected by P. penetrans inoculum level. Transpiration of plants inoculated with 0, 500, 5,000 or 50,000 P. penetrans was recorded weekly from 14 to 56 days after planting. No consistent effects of nematode inoculum density on transpiration rate were observed. Root hydraulic conductivity was lower in Katahdin plants inoculated with 266 P. penetrans per plant and in Chippewa with 5,081 per plant than in noninoculated plants. Nematodes reduced leaf area of Superior, Chippewa, and Katahdin and root dry weight of Chippewa but had no effect on growth of Hudson, Onaway, or Russet Burbank plants. Assessing nematode effects on root hydraulic conductivity may provide a measure of the tolerance of potato cultivars to nematodes.
用0、1500或15000条穿刺短体线虫接种马铃薯（Solanum tuberosum）品种Katahdin和Superior的植株。生长56天后在温室中用气孔计测量蒸腾作用，结果表明线虫接种水平之间或品种之间的蒸腾作用没有显著差异。接种1500或15000条穿刺短体线虫的Katahdin植株以及接种15000条穿刺短体线虫的Superior植株的断头根系木质部渗出速率低于未接种植株。Katahdin和Superior的根重不受穿刺短体线虫接种水平的影响。从种植后14天到56天每周记录接种0、500、5000或50000条穿刺短体线虫的植株的蒸腾作用。未观察到线虫接种密度对蒸腾速率有一致的影响。每株接种266条穿刺短体线虫的Katahdin植株和每株接种5081条穿刺短体线虫的Chippewa植株的根水力导度低于未接种植株。线虫减少了Superior、Chippewa和Katahdin的叶面积以及Chippewa的根干重，但对Hudson、Onaway或Russet Burbank植株的生长没有影响。评估线虫对根水力导度的影响可能提供一种衡量马铃薯品种对线虫耐受性的方法。
