Summary
Chromosome 5A of bread wheat, Triticum aestivum carries the major gene, Vrnl, which is one of the main determinants of the winter/spring growth habit polymorphism in this species. Genetical analysis of this chromosome has been carried out using single-chromosome recombinant lines to establish the pleiotropic effects of this locus and two other major genes, q determining ear morphology and bl determining the presence of awns, on important agronomic characters. The three major genes were located on the long arm of chromosome 5A with a gene order of: centromere -bl-q-Vrnl. Analysis of quantitative characters from a winter sowing revealed pleiotropic effects of Vrnl or the effects of closely linked loci on the characters plant height, tiller number and spikelet number. However effects on ear emergence time were not associated with Vrnl but with q as were effects on spikelet number and ear length. In addition a locus determining yield/plant was located between Vrnl and q. Independant loci determining height and ear length were apparent on the short arm of chromosome 5A. From a spring sowing, however, there was a large pleiotropic effect of Vrnl on ear emergence time, as well as the effects previously detected. In addition, associated with q were effects on plant height and grain size which were not expressed from the winter sowing.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Halloran GM (1966) Gene dosage and character expression in bread wheat. J Aust Inst Agr Sci 32:228–229
Halloran GM, Boydell CW (1967) Wheat chromosomes with genes for vernalisation response. Can J Genet Cytol 9:632–639
Kirby EJM, Appleyard M, Fellowes G (1984) Variation in development of wheat and barley in response to sowing date and variety. J Agric Sci 104:383–396
Law CN (1966) The location of genetic factors affecting a quantitative character in wheat. Genetics 53:487–498
Law CN (1967) The location of genetic factors controlling a number of quantitative characters in wheat. Genetics 56:445–461
Law CN, Snape JW, Worland AJ (1981) Intraspecific chromosome manipulation. Philos Trans R Soc London, Ser B 292:509–518
Law CN, Worland AJ (1973) Aneuploidy in wheat and its uses in genetic analysis. Plant Breed Inst Annu Rep 1972:25–65
Law CN, Worland AJ, Giorgi B (1976) The genetic control of ear-emergence time by chromosomes 5A and 5D of wheat. Heredity 36:49–58
Law CN, Worland AJ, Young CF (1978) Developmental studies in wheat using whole chromosome substitution lines. In: Proc 14th Congr Genet, Moscow 1978, pp 282–294
Mackey J (1954) Neutron and X-ray experiments in wheat and a revision of the speltoid problem. Hereditas 40:65–180
Mather K, Jinks JL (1971) Biometrical genetics. Chapman and Hall, London
McIntosh RA (1973) A catalogue of gene symbols for wheat. In: Sears ER, Sears LMS (eds) Proc 4th Int Wheat Genet Symp. Columbia Mo, pp 893–937
Morrison JW (1960) The monosomic analysis of growth habit in winter wheat. Z Vererbungl 91:141–151
Snape JW, Law CN (1980) The detection of homologous chromosome variation in wheat using backcross reciprocal monosomic lines. Heredity 45:187–200
Snape JW, Law CN, Worland AJ (1976) Chromosome variation for loci controlling ear-emergence time on chromosome 5A of wheat. Heredity 37:335–340
Snape JW, Law CN, Worland AJ (1977) Whole chromosome analysis of height in wheat. Heredity 38:25–36
Tsunewaki K (1966) Comparitive gene analysis of common wheat and its ancestral species. 2. Waxiness, growth habit and awnedness. Jpn J Bot 19:175–229
Watkins AE, Ellerton S (1940) Variation and genetics of the awn in Triticum. J Genet 40:243–270
Author information
Authors and Affiliations
Additional information
Communicated by R. Riley
Rights and permissions
About this article
Cite this article
Snape, J.W., Law, C.N., Parker, B.B. et al. Genetical analysis of chromosome 5A of wheat and its influence on important agronomic characters. Theoret. Appl. Genetics 71, 518–526 (1985). https://doi.org/10.1007/BF00251199
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00251199