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  • Author or Editor: Matiyar Rahaman Khan x
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Summary

A new species of pin nematode, Paratylenchus jasmineae sp. n., was isolated and described from the rhizosphere of jasmine in India. The new species can be diagnosed by having a relatively larger body length of 248-355 μm, stylet length of 24.6-28.5 μm, lateral field with four lateral lines, the presence of small post-vulval uterine sac and absence of advulval flaps in the females. Additional morphological characters included continuous lip region with small projected submedian lobes, large and oblong-shaped spermatheca, the presence of prevulval swelling, and arcuate conoid tail with finely rounded terminus. Molecular characterisation of the species was carried out based on internal transcribed spacer sequence (ITS rRNA) and D2-D3 expansion segment of 28S rRNA subunit. Phylogenetic analyses based on ITS and D2-D3 molecular markers resulted in clear separation of P. jasmineae sp. n. from other Paratylenchus species.

In: Nematology

Summary

A population of Ficophagus was recovered from white fig (Ficus virens) in New Delhi, India. We further described the population as Ficophagus virens based on morphological and morphometric characters, and molecular data. A detailed description of key morphological features, measurements of taxonomic characters, and photomicrography of the male and female specimens are given here. The study also included additional parameters such as lip diam. and height, conus stylet, shaft stylet, knobs diam. and height, vulva position from anterior end, length and width of spermatheca, anal/cloacal body diam., vulval width, and ovary/testis length for better characterisation of species. In addition to 28S rDNA (D2/D3), new sequence data from small subunit rDNA (18S) and mitochondrial cytochrome oxidase I COI marker gene were added. The D2/D3 sequence of F. virens was most similar to the sequence available for the Australian population of F. virens in GenBank. Maximum likelihood (ML) and Bayesian methods were used to analyse phylogenetic relationships of the Indian population of F. virens with those of the Australian populations and other Ficophagus species. This species is a new record from Delhi, India, and hence this report provides a new geographical location for the F. virens nematode after the first report from Australia.

In: Nematology

Summary

The distribution and community structure of plant-parasitic nematodes associated with betel (Piper betle) vine and their relationship with soil chemical properties were investigated in four major growing regions of West Bengal, India. Ordinary kriging method was applied to infer the patterns of spatial distribution of major plant-parasitic nematodes across the growing regions. Meloidogyne and Rotylenchulus were found to be the most abundant genera in betel vine crops in all growing regions. Co-inertia analysis between soil properties and nematode abundance indicated that soil chemical characters significantly affect abundances of plant-parasitic nematodes. The type of betel vine crop (sweet and bitter) also has a significant effect on the abundance of plant-parasitic nematodes, with the highest abundance of Meloidogyne reported from the bitter type of betel crop. Spatial distribution depicted a higher abundance of Meloidogyne throughout the North Bengal growing region. Root-knot and reniform nematodes are two important plant-parasitic nematodes of betel vine that might cause economic yield loss to the growers in West Bengal.

In: Nematology

Summary

A population of a Hemicriconemoides species was found from the rhizosphere of sugarcane in the Meerut district, Uttar Pradesh, India. Preliminary morphological studies led to the identification of the species as H. rosae. Further morphological and morphometric characterisation of the species was carried out by light microscopy. The gross morphology was consistent with the description of H. rosae except for some deviations in measurements. Here we present an amended description of the species together with illustrations and additional morphometric and morphological characters. The diagnostic relationship of H. rosae is given based on morphological and molecular information and a comparative study of paratype and holotype females. In addition, ITS rRNA and D2-D3 sequences were used for the construction of evolutionary relationship by Bayesian inference. The present study provides molecular data and a redescription of H. rosae collected from the rhizosphere of sugarcane in India.

In: Nematology