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Variation in important pasture grasses. II. Cytogenetic and reproductive variation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.J. Spies --- Department of Agriculture and Water Supply, G.E. Gibbs Russell --- Department of Agriculture and Water Supply,The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all reproduce both sexually and either apomictically or vegetatively, and some form of hybridization... -
Absence of the 1BL/1RS chromosome translocation in the Kavkaz-derived wheat cultivar Tugela
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Z.A. Pretorius --- Department of Plant Pathology, Republic of South Africa G.F. Marais --- department of Genetics, Republic of South Africa J. Smith --- Small Grain Centre, Republic of South Africa J. le Roux --- Small Grain Centre, Republic of South Africa F.J. Kloppers --- Department of Plant Pathology, Republic of South AfricaThe South African bread wheat (Triticum aestivumL) cultivar Tugela (Kavkaz/Jaral'S') is highly resistant to stem rust caused by Puccinia graminis Pers. f. sp. tritici Eriks. & Henn. Based on pedigree analysis and infection types, it has previously been assumed that... -
A genetic study of the gametocidal effect of the Lr19 translocation of common wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R. Prins --- Department of Genetics, University of Stellenbosch, Republic of South Africa G.F. Marais --- Department of Genetics, Republic of South AfricaThe Lr19 translocation is preferentially transmitted to the progeny of a heterozygote due to the actions of at least two genes, Sd1 and Sd2 (new designation). However, only Sd2 occurs in the recombinant, Lr19-149, and often causes self-elimination of the... -
Chromosome number of the South African abalone Haliotis midae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M van der Merwe R Roodt-WildingDespite the widespread distribution of the genus Haliotis, chromosome numbers are only known for a small subset of species. In South Africa, no chromosome studies have been conducted on any of the five species occurring in the region. This study... -
Chromosomal rearrangements occurred repeatedly and independently during species diversification in Malagasy geckos, genus Paroedura
Item type: Journal Article • Journal: African Zoology • Authors: Gennaro Aprea --- Dipartimento di Biologia, Italy Franco Andreone --- Museo Regionale di Scienze Naturali, Italy Domenico Fulgione --- Dipartimento di Biologia, Italy Agnese Petraccioli --- Dipartimento di Biologia, Italy Gaetano Odierna --- Dipartimento di Biologia, ItalyWe conducted a phylogenetic study through karyological data, by standard staining and Ag-NOR banding, and molecular analysis (by 12S and 16S mitochondrial rRNA genes and nuclear gene C-mos) on 11 species of Malagasy geckos, genus Paroedura, and two relatives (Ebenavia... -
Phylogenetic tests of a Cercopithecus monkey hybrid reveal X-chromosomal polyphyly of C. cephus and emerging patterns in the cephus species group radiation
Item type: Journal Article • Journal: African Zoology • Authors: Anthony J Tosi --- Department of Anthropology, USAA captive Cercopithecus nictitans × C. cephus male was examined at loci on the X- and Y-chromosomes as a test of previously described phylogenetic methods for identifying hybrid Cercopithecus monkeys. The results confirm the reliability of such assays, indicating that... -
First chromosomal analysis for the genus Lygodactylus (Gray, 1864): The karyotype of L. picturatus (Squamata, Gekkonidae, Gekkoninae)
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: Riccardo Castiglia --- Università di Roma “La Sapienza”, ItalyThe karyotype of Lygodactylus picturatus is here described, providing the first description of the karyotype in the genus. One male from Tanzania shows 2n = 40 (30 telocentrics, 6 subtelocentrics, 4 small metacentrics,) while one female from Kenya presents 2n... -
Karyotypes of two species of Malagasy ground gecko (Paroedura: Gekkonidae)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Hana Main --- University of Minnesota, USA DanielP. Scantlebury --- University of Rochester, USA David Zarkower --- University of Minnesota, USA Tony Gamble --- University of Minnesota, USAThe karyotypes of Malagasy geckos are poorly known. Herein, we describe the karyotypes of two Malagasy gecko species, Paroedura picta and an undescribed or currently unrecognised Paroedura species. These are the first karyotypes described for the genus Paroedura. Each species... -
Modification of the Aegilops neglecta - common wheat Lr62/Yr42 translocation through allosyndetic pairing induction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- Department of Genetics, University of Stellenbosch, Private Bag X1, South Africa A.S. Marais --- Department of Genetics, University of Stellenbosch, Private Bag X1, South Africa A. Eksteen --- Department of Genetics, University of Stellenbosch, Private Bag X1, South Africa Z.A. Pretorius --- Department of Plant Sciences, University of the Free State, South AfricaThe Lr62/Yr42 translocation comprises mostly alien chromatin and retains only the very distal end of wheat chromosome arm 6AL, including the telomere. The large amount of foreign chromatin prohibits commercial use of the resistance and an attempt was therefore made...