Halbrendt J M, Brown D J
J Nematol. 1994 Jun;26(2):212-21.
Ten populations of Xiphinema americanum-group nematodes were reared from individual females to evaluate inter- and intraspecific variation under identical host and environmental conditions. Data indicated that morphometric variability of X. americanum was the result of genetic variation rather than phenotypic plasticity and that genetic heterogeneity was greater than previously thought. Morphometrics of single female derived (SFD) populations identified different genotypes present in the field populations. Stylet length was the least variable morphometric character of SFD populations, but collectively stylet measurements of all individuals formed an uninterrupted continuum ranging from 107-148 mum. Range and frequency of stylet measurements of field populations could be accounted for by the relative proportion of different genotypes in the population. Nine SFD populations were identified as X. americanum sensu stricto, and one SFD population was similar to X. californicum.
从单个雌虫饲养了十组美洲剑线虫属线虫种群，以评估在相同寄主和环境条件下的种间和种内变异。数据表明，美洲剑线虫的形态测量变异是遗传变异的结果，而非表型可塑性，并且遗传异质性比之前认为的更大。单雌虫衍生（SFD）种群的形态测量确定了田间种群中存在的不同基因型。口针长度是SFD种群中变异最小的形态测量特征，但所有个体的口针测量值总体上形成了一个从107至148微米的不间断连续区间。田间种群口针测量的范围和频率可由种群中不同基因型的相对比例来解释。九个SFD种群被鉴定为狭义的美洲剑线虫，一个SFD种群与加州剑线虫相似。
