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Morphology and Morphometrics of Hoplolaimus columbus Sher, 1963 Populations from Assam, India

Indian Agricultural Research Journals

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Title Morphology and Morphometrics of Hoplolaimus columbus Sher, 1963 Populations from Assam, India
 
Creator G, VENKADESH
DAS, DEBANAND
BASUMATARY, BINITA
CHOUDHURY, B. N.
KHAN, MATIYAR RAHAMAN
 
Subject Geographical location, Hoplolaimus columbus, host, Intraspecific variation, morphometrics, parthenogenesis
 
Description Columbia lance nematode (Hoplolaimus columbus Sher, 1963) was identified among the samples collected from the rhizosphere of three host plants viz., Jackfruit (Artocarpus heterophyllus), Mango (Mangifera indica) and Tea (Camellia sinensis), and three geographical locations viz., Lakhimpur, Nagaon and Karbi Anglong districts of Assam from the banana rhizosphere. Morphology and morphometric variations were recorded among the populations. The species was identified as H. columbus based on the number of lip annuli (3-4) in the lip region and longitudinal lines (10-15) in the basal annulus, SE pore posterior to the nerve ring and hemizonid 2-5 annuli behind the secretary-excretory pore, six gland nuclei in oesophageal glands, phasmids on either side of the vulva, number of tail annuli (13-22), and morphometric values. Morphometric observations in females of H. columbus showed that body length, length of the oesophagus, stylet length, anal body width, the distance of the secretary-excretory pore, nerve ring, median bulb, and oesophageal gland overlapping from the anterior end, a, b, V%, median bulb, and Pp (per cent of the distance of posterior phasmid from anterior end to body length) were least variable characters (CV < 10). The characters such as tail length, number of tail annuli, body width, bʹ, c, cʹ, and Pa (anterior phasmid) were variable (CV > 10) to both hosts and geographical locations. Thus, this study confirms that H. columbus being a parthenogenetic species, shows the least morphometric plasticity and is not much induced by the hosts and geographic locations. Further, low intraspecific variations indicate no cryptic speciation in H. columbus.
 
Publisher Nematological Society of India
 
Date 2024-09-04
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
 
Identifier https://epubs.icar.org.in/index.php/IJN/article/view/156046
 
Source Indian Journal of Nematology; Vol. 53 No. 1 (2023): Indian Journal of Nematology; 28-36
0974-4444
0303-6960
 
Rights Copyright (c) 2024 Indian Journal of Nematology
https://creativecommons.org/licenses/by-nc-sa/4.0