Griffin G D, Gray F A
J Nematol. 1995 Sep;27(3):353-61.
Greenhouse and growth chamber studies were established to determine if there are pathological and physiological differences among Meloidogyne hapla populations from California (CA), Nevada (NV), Utah (UT), and Wyoming (WY) on alfalfa cultivars classified as resistant or susceptible to root-knot nematodes. In the greenhouse, plant survival was not consistent with resistance classifications. While all highly resistant Nevada Synthetic germplasm (Nev Syn XX) plants survived inoculation with all nematode populations, two cultivars classified as moderately resistant ('Chief' and 'Kingstar') survived (P </= 0.05) inoculation with M. hapla populations better than did 'Lobo' cultivar, which is classified as resistant. Plant growth of Nev Syn XX was suppressed by only the CA population, whereas growth of the other alfalfa cultivars classified as M. hapla resistant or moderately resistant was suppressed by all nematode populations. Excluding Nev Syn XX, all alfalfa cultivars were severely galled and susceptible to all nematode populations. Except for Nev Syn XX, reproduction did not differ among the nematode populations on alfalfa cultivars. Nev Syn XX was not as favorable a host to CA as were the other cultivars; but, it was a good host (reproductive factor [Rf] = 37). Temperature affected plant resistance; the UT and WY populations were more pathogenic at 15-25 C, and CA was more pathogenic at 30 C. Nev Syn XX was susceptible to all nematode populations, except for CA, at only 30 C, and all other alfalfa cultivars were susceptible to all nematode populations at all temperatures.
开展了温室和生长室研究，以确定来自加利福尼亚州（CA）、内华达州（NV）、犹他州（UT）和怀俄明州（WY）的苜蓿根结线虫群体，在对根结线虫分类为抗性或敏感的苜蓿品种上是否存在病理和生理差异。在温室中，植株存活情况与抗性分类不一致。虽然所有高抗的内华达合成种质（Nev Syn XX）植株在接种所有线虫群体后都存活下来，但两个分类为中抗的品种（“Chief”和“Kingstar”）在接种苜蓿根结线虫群体后的存活情况（P≤0.05）优于分类为抗性的“Lobo”品种。Nev Syn XX的植株生长仅受到CA群体的抑制，而其他分类为抗苜蓿根结线虫或中抗的苜蓿品种的生长受到所有线虫群体的抑制。除Nev Syn XX外，所有苜蓿品种都严重受虫瘿侵害且对所有线虫群体敏感。除Nev Syn XX外，苜蓿品种上线虫群体间的繁殖情况没有差异。Nev Syn XX对CA群体而言，不像其他品种那样是适宜的寄主；但是，它是一个良好的寄主（繁殖因子[Rf]=37）。温度影响植株抗性；UT和WY群体在15 - 25℃时致病性更强，而CA群体在30℃时致病性更强。Nev Syn XX仅在30℃时对除CA群体外的所有线虫群体敏感，而所有其他苜蓿品种在所有温度下对所有线虫群体都敏感。
