Anwar Sadfar A, McKenry M V
HEC-Foreign Professor, Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan Nematologist, University of California, Department of Nematology, Riverside, CA 92521.
J Nematol. 2007 Jun;39(2):105-10.
A range of virulence levels was found in four populations of Meloidogyne incognita collected from cotton fields of the Punjab region of Pakistan. The most virulent population was associated with development of larger gall size, larger giant cell formation and improved success of juveniles transitioning into reproducing adults. The most virulent nematode population, MI-78, emanated from cotton cultivar NIAB-78. This cotton cultivar also possessed the greatest level of resistance to the three other nematode populations evaluated in this study. The source of plant resistance was not evident during root penetration by second-stage juveniles (J2), but became apparent as nematode feeding was attempted. Although one other cotton cultivar, CIM-506, could also be designated as showing a level of resistance, none of the other cultivars reduced any nematode stage by more than 75% of that achieved on the best host. These data provide an example of a single cotton cultivar that could have short-term utility in field settings. The data also provide insight for future cotton breeding programs.
在从巴基斯坦旁遮普地区棉田采集的四个南方根结线虫群体中发现了一系列毒力水平。毒性最强的群体与更大的虫瘿大小、更大的巨型细胞形成以及幼虫向繁殖成虫转变的成功率提高有关。毒性最强的线虫群体MI - 78来自棉花品种NIAB - 78。该棉花品种对本研究中评估的其他三个线虫群体也具有最高水平的抗性。在二龄幼虫（J2）穿透根部期间，植物抗性的来源并不明显，但在尝试线虫取食时变得明显。虽然另一个棉花品种CIM - 506也可被指定为表现出一定程度的抗性，但其他品种对线虫任何阶段的减少都没有超过在最佳寄主上所达到减少量的75%。这些数据提供了一个单一棉花品种在田间环境中具有短期实用性的例子。这些数据也为未来的棉花育种计划提供了见解。
