Kraus-Schmidt H, Lewis S A
J Nematol. 1981 Jan;13(1):41-8.
Cotton seedlings grown in a greenhouse and a growth chamber were inoculated with Scutellonema brachyurum, Hoplolaimus columbus, and Meloidogyne incognita, singly and in all possible combinations, at two initial population (Pi) levels (100 and 300/100 cm(3)). S. brachyurum alone was not pathogenic to cotton at these population levels. It fed primarily as an ectoparasite but matured and reproduced within the root when it penetrated. Populations of S. brachyurum increased in the presence of H. columbus but were suppressed by M. incognita. H. columbus suppressed dry shoot weights of cotton (P = 0.05) at a Pi of 300/100 cm(3) soil. Simultaneous inoculation of H. columbus with either M. incognita or S. brachyurum increased H. columbus populations over treatments with H. columbus alone, both at 60 and 90 d after inoculation. M. incognita suppressed cotton shoot weights significantly (P = 0.05) at both Pi levels. Inoculation with S. brachyurum increased M. incognita populations 60 d after inoculation, while H. columbus suppressed populations of M. incognita. Most larvae of M. incognita did not develop to maturity in the presence of H. columbus. Giant cells aborted and were necrotic 20-25 d after inoculation. Since M. incognita and H. columbus feed on different tissues, the inhibition of M. incognita may have resulted from a physiological effect of H. columbus on the host.
在温室和生长室中培育的棉花幼苗，分别以两种初始种群（Pi）水平（100和300/100 cm³），单独接种短尾盾线虫、哥伦比亚螺旋线虫和南方根结线虫，并进行所有可能的组合接种。在这些种群水平下，单独的短尾盾线虫对棉花无致病性。它主要以体外寄生方式取食，但侵入根部后会成熟并繁殖。在哥伦比亚螺旋线虫存在的情况下，短尾盾线虫种群数量增加，但受到南方根结线虫的抑制。在土壤Pi为300/100 cm³时，哥伦比亚螺旋线虫抑制了棉花地上部干重（P = 0.05）。在接种后60天和90天，将哥伦比亚螺旋线虫与南方根结线虫或短尾盾线虫同时接种，其种群数量均高于单独接种哥伦比亚螺旋线虫的处理。在两个Pi水平下，南方根结线虫均显著抑制了棉花地上部重量（P = 0.05）。接种短尾盾线虫后60天，南方根结线虫种群数量增加，而哥伦比亚螺旋线虫抑制了南方根结线虫的种群数量。在哥伦比亚螺旋线虫存在的情况下，大多数南方根结线虫幼虫不能发育成熟。接种后20 - 25天，巨型细胞停止发育并坏死。由于南方根结线虫和哥伦比亚螺旋线虫取食不同组织，哥伦比亚螺旋线虫对南方根结线虫的抑制作用可能是其对宿主产生生理效应的结果。
