Al-Hazmi A S, Al-Yahya F A, Abdul-Razig A T
J Nematol. 1999 Dec;31(4S):662-6.
TWO POT EXPERIMENTS, IN CONSECUTIVE YEARS, WERE CONDUCTED UNDER OUTDOOR CONDITIONS DURING THE WHEAT GROWING SEASON TO EXAMINE THE RELATIONSHIP BETWEEN INCREASING INITIAL POPULATION DENSITIES (PI: 0-3,000 cysts/pot) of Heterodera avenae and corresponding responses of wheat cv. Yecora Rojo. Results of both experiments were very similar. The nematode suppressed plant height, root and biomass dry weights, and grain yield at all Pi's studied. The suppression of these parameters, as well as the final nematode population densities (Pf), increased with increasing Pi levels. The reproduction factor (Pf/Pi) decreased as Pi increased but was always greater than 1.0. When data from both experiments were combined for regression analyses, inverse relationships were found between log(10) (Pi + 1) and both plant growth and yield. These negative relationships were highly significant and adequately described by linear models. Final population (Pf) increased linearly with Pi. The wheat cultivar cv. Yecora Rojo was found to be highly vulnerable to damage and a good host for H. avenae.
在小麦生长季节，连续两年在室外条件下进行了两个盆栽试验，以研究燕麦孢囊线虫初始种群密度（Pi：0 - 3000个孢囊/盆）增加与小麦品种Yecora Rojo相应反应之间的关系。两个试验的结果非常相似。在所研究的所有Pi水平下，线虫均抑制了株高、根干重、生物量干重和籽粒产量。这些参数的抑制作用以及最终线虫种群密度（Pf）均随着Pi水平的增加而增加。繁殖系数（Pf/Pi）随着Pi的增加而降低，但始终大于1.0。当将两个试验的数据合并进行回归分析时，发现log(10)（Pi + 1）与植物生长和产量之间呈反比关系。这些负相关关系高度显著，并且可以通过线性模型充分描述。最终种群（Pf）随Pi呈线性增加。发现小麦品种Yecora Rojo极易受到损害，是燕麦孢囊线虫的良好寄主。
