Morphology and description of Helicotylenchus crassatus n. sp. (Nematoda: Hoplolaimidae) from eastern Canada

1973 ◽  
Vol 51 (11) ◽  
pp. 1195-1200 ◽  
Author(s):  
R. V. Anderson
Keyword(s):  
Related Species ◽  
Diagnostic Value ◽  
Eastern Canada ◽  
Closely Related Species ◽  
Parasitic Species ◽  
Head Skeleton ◽  
Vaginal Sphincter ◽  
Plant Parasitic

A new plant parasitic species of the genus Helicotylenchus Steiner, 1945, common to eastern Canada, is described and illustrated. Helicotylenchus crassatus can be distinguished from closely related species by the sclerotization of the head skeleton, size and position of the anterior cephalid, and thickness of the vagina. The morphology and diagnostic value of the head skeleton, hypodermal commissures, vulva, vagina, vaginal sphincter, and oviduct are discussed.

Two new Atheta species (Coleoptera: Staphylinidae: Aleocharinae) from eastern Canada: taxonomy, bionomics, and distribution

2007 ◽  
Vol 139 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Jan Klimaszewski ◽  
Christopher G. Majka
Keyword(s):  
New Species ◽  
Nova Scotia ◽  
New Brunswick ◽  
Related Species ◽  
Prince Edward Island ◽  
Eastern Canada ◽  
Closely Related Species ◽  
Black And White

AbstractTwo new athetine beetles from eastern Canada are described and illustrated: Atheta (Metadimetrota) savardae Klimaszewski and Majka, sp. nov. (Nova Scotia, Quebec) and Atheta (Datomicra) acadiensis Klimaszewski and Majka, sp. nov. (Nova Scotia, New Brunswick, Prince Edward Island, and Quebec). Their relationships to other closely related species are discussed, and new data on bionomics and distribution are provided. The new species are presented with a short diagnosis, description, colour habitus images, and black-and-white genital images.

Canadian species of the genus Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae), their identifying characteristics and descriptions of three new species

1974 ◽  
Vol 52 (11) ◽  
pp. 1365-1381 ◽  
Author(s):  
R. V. Anderson
Keyword(s):  
New Species ◽  
Diagnostic Value ◽  
Closely Related Species ◽  
Lateral Field ◽  
New Information ◽  
Gland Duct ◽  
Three New Species ◽  
Labial Disc ◽  
Dorsal Gland ◽  
Head Skeleton

Descriptions, illustrations, distribution, and host affiliations are presented for 12 species of spiral nematodes that occur in Canada, including 3 new species. The only bisexual species, H. cornurus n. sp., is distinguishable from closely related species with a rounded head and ventral tail projection by the development of the head skeleton, length of the spear, width of the lateral field, spicula dimensions, and annulation of the tail terminus, which typically is indented. A prominent labial disc in H. phalerus n. sp. is one of the more important characters that distinguishes it from closer relatives. H. teleductus n. sp. is unique in the posterior position of the dorsal gland duct terminus (14 to 17 μ from the spear knobs) and of the excretory pore, which is well posterior to the esophagointestinal valve. Ranges in dimensions and form within the remaining Canadian species complement other descriptions and provide new information of diagnostic value. A key is presented to facilitate separation of the Canadian species.

PUCCINIA KARELICA AND SPECIES DELIMITATION IN THE UREDINALES

1965 ◽  
Vol 43 (2) ◽  
pp. 231-238 ◽  
Author(s):  
D. B. O. Savile
Keyword(s):  
United States ◽  
British Columbia ◽  
Related Species ◽  
Species Delimitation ◽  
Species Concepts ◽  
Distinct Population ◽  
Eastern Canada ◽  
Closely Related Species ◽  
Typical Form ◽  
Coastal British Columbia

The problem of species concepts and delimitation in the heteroecious rusts is discussed. It is illustrated by Puccinia karelica, which is known in typical form from Europe, southern Alaska, coastal British Columbia, and apparently Kamchatka and Saghalien. A distinct population in eastern Canada and adjacent United States is named ssp. laurentina ssp. nov. P. karelica is compared with closely related species and its probable mode of evolution is discussed.

Microsatellite Marker: Importance and Implications of Cross-genome Analysis for Finger Millet (Eleusine coracana (L.) Gaertn)

2020 ◽  
Vol 9 (3) ◽  
pp. 160-170
Author(s):  
Thumadath P.A. Krishna ◽  
Maharajan Theivanayagam ◽  
Gurusunathan V. Roch ◽  
Veeramuthu Duraipandiyan ◽  
Savarimuthu Ignacimuthu
Keyword(s):  
Molecular Marker ◽  
Microsatellite Markers ◽  
Ssr Markers ◽  
Genome Analysis ◽  
Related Species ◽  
Finger Millet ◽  
Crop Improvement ◽  
Human Beings ◽  
Closely Related Species ◽  
Genome Amplification

Finger millet is a superior staple food for human beings. Microsatellite or Simple Sequence Repeat (SSR) marker is a powerful tool for genetic mapping, diversity analysis and plant breeding. In finger millet, microsatellites show a higher level of polymorphism than other molecular marker systems. The identification and development of microsatellite markers are extremely expensive and time-consuming. Only less than 50% of SSR markers have been developed from microsatellite sequences for finger millet. Therefore, it is important to transfer SSR markers developed for related species/genus to finger millet. Cross-genome transferability is the easiest and cheapest method to develop SSR markers. Many comparative mapping studies using microsatellite markers clearly revealed the presence of synteny within the genomes of closely related species/ genus. Sufficient homology exists among several crop plant genomes in the sequences flanking the SSR loci. Thus, the SSR markers are beneficial to amplify the target regions in the finger millet genome. Many SSR markers were used for the analysis of cross-genome amplification in various plants such as Setaria italica, Pennisetum glaucum, Oryza sativa, Triticum aestivum, Zea mays and Hordeum vulgare. However, there is very little information available about cross-genome amplification of these markers in finger millet. The only limited report is available for the utilization of cross-genome amplified microsatellite markers in genetic analysis, gene mapping and other applications in finger millet. This review highlights the importance and implication of microsatellite markers such as genomic SSR (gSSR) and Expressed Sequence Tag (EST)-SSR in cross-genome analysis in finger millet. Nowadays, crop improvement has been one of the major priority areas of research in agriculture. The genome assisted breeding and genetic engineering plays a very crucial role in enhancing crop productivity. The rapid advance in molecular marker technology is helpful for crop improvement. Therefore, this review will be very helpful to the researchers for understanding the importance and implication of SSR markers in closely related species.

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