Morphological and karyotypic differences within and among populations of Radopholus similis

By

Xu, Chunling
Li, Yun
Xie, Hui
Huang, Xin
Wu, Wen-Jia
Yu, Lu
Wang, Dongwei

Type

Article

Date of Publication

2014

Original Publication

ZooKeys

Volume

444

Pages

69-93

Subjects

Burrowing nematode , karyotype , morphological comparison , optical and SEM microscopy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.444.8186

 

Abstract

Twenty populations of Radopholus similis from three countries and different hosts (19 populations from ornamental plants and one population from ginger) were compared using morphological characters, morphometrics and karyotype between progeny from both single females and 30 females of each population. Morphological diversity existed in and among the populations, even within the progeny nematodes from single nematodes compared to that of 30 females. The labial disc shape, the number of head annuli, the terminated position of lateral lips, the number of genital papillae before cloacal apertures and female and male tail terminal shape showed variation. In addition, genital papillae arranged in a double row before cloacal apertures was first found in two ornamental populations. The karyotype of all the 20 populations was n = 5. Combining our results and previous studies, we support that R. citrophilus is a synonym of R. similis, and that it is not possible to distinguish physiological races or pathotypes of R. similis according to morphological characters or karyotype.