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Title: Genetic studies in zonal pelargoniums
Author: Amoatey, H. M.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1991
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Aspects of the biology of zonal pelargoniums are reviewed. Genetic analysis of two alternative patterns of biparental plastid inheritance in p. x hortorum confirms the hypothesis that these are controlled by a pair of nuclear genes, Pr1 and Pr2, with complementary interaction. After G x W plastid crosses, when dominant alleles of both genes are present in the maternal genotype, the progeny receive plastids in similar proportions from both parents, whereas when the dominant alleles of either or both genes are absent, the progeny receive far more plastids from the maternal than from the paternal parent. Although there is great variation within these patterns - type II and type I respectively - they are sufficiently distinctive to enable the monitoring of F2, single and double backcross segregating families with confidence. The causes of variation are discussed. The genetic analysis of leaf zonation, caused by localization of anthocyanin pigments into a band or spot, shows that at least five patterns are determined by homozygotes for five alleles of a single gene, Zo. Some heterozygotes between these alleles produce zones like the dominant parent, whereas others generate zones intermediate between the parents, in width or position. Interspecific crosses between P. x hortorum and P. peltatum show that the production of F1 seedlings is dependent upon the choice of cultivar and the direction of cross. Manifestations of incompatibility continue throughout the growth of seedlings and only the more favourable genotypes are capable of producing an F2 generation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available