Fortnum B A, Kasperbauer M J, Hunt P G, Bridges W C
J Nematol. 1991 Jul;23(3):291-7.
Tomato plants were inoculated with Meloidogyne incognita at initial populations (Pi) of 0, 1, 10, 50, 100, and 200 (x 1,000) eggs per plant and maintained in a growth chamber for 40 days. Total fresh biomass (roots + shoots) at harvest was unchanged by nematode inoculation with Pi of 1 x 10 eggs or less. Reductions in fresh shoot weight with increasing Pi coincided with increases in root weight. Total fresh biomass declined with Pi above 1 x 10 eggs, whereas total dry biomass declined at Pi above 1 x 10 eggs. The greatest reduction percentages in fresh shoot biomass induced by root-knot nematodes occurred in the stem tissue, followed by the petiole + rachis; the least weight loss occurred in the leaflets. Although biomass varied among shoot tissues, the relationship between biomass of various shoot tissues and Pi was described by quadratic equations. The linear and quadratic coefficients of the equations (stem, petiole + rachis, or leaflets on Pi) did not differ among tissues when calculations were based on standardized values. Meloidogyne incognita-infected plants had thinner leaves (leaf area/leaf weight) than did uninfected plants. Reductions in leaf weight and leaf area with nematode inoculation occurred at nodes 5-15 and 4, 6-14, respectively. Losses in plant height and mass due to nematodes reflected shorter internodes with less plant mass at each node.
番茄植株以每株0、1、10、50、100和200（×1000）个卵的初始种群（Pi）接种南方根结线虫，并在生长室中培养40天。当Pi为1×10个卵或更少时，线虫接种对收获时的总鲜生物量（根+地上部）没有影响。随着Pi的增加，地上部鲜重的降低与根重的增加同时发生。当Pi高于1×10个卵时，总鲜生物量下降，而当Pi高于1×10个卵时，总干生物量下降。根结线虫诱导的地上部鲜生物量最大降低百分比出现在茎组织中，其次是叶柄+叶轴；小叶的重量损失最小。尽管地上部组织的生物量有所不同，但各地上部组织生物量与Pi之间的关系可用二次方程描述。当基于标准化值进行计算时，方程的线性和二次系数（茎、叶柄+叶轴或小叶与Pi的关系）在各组织之间没有差异。感染南方根结线虫的植株叶片（叶面积/叶重）比未感染的植株更薄。线虫接种导致的叶重和叶面积减少分别发生在第5 - 15节和第4、6 - 14节。线虫导致的株高和质量损失反映为节间缩短，每个节的植株质量减少。
