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Title: Studies of plastid inheritance in zonal pelargoniums
Author: Wasi'an, Ir
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2000
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The history is briefly reviewed. Biparental plastid inheritance is compared from several species. The hybrid lines of uncertain type II cultivars are selfed, and crossed with two type I testers, green Dolly Varden and W1A, to obtain hybrids. These are now crossed with white Flower of Spring, as source of mutant plastids, and the embryos scored. The three hybrids are all different, one is double heterozygote, Pr1pr1, Pr2pr2 and the other two are single heterozygote for opposite genes, Pr1Pr1, Pr2pr2 and Pr1pr1, Pr2Pr2. From one hybrid, a single true-breeding double dominant Pr1Pr1, Pr2Pr2 is raised. From many single heterozygotes, the male plastids are transmitted with high frequency, although with others the female plastids are favoured. The analysis confirms the importance of the two genes Pr1 and Pr2 controlling biparental plastid inheritance, and in particular the value of the two testers in isolating all type IIs. Five white-over-green (variegated) cultivars (Dolly Varden, J.C. Mappin, Miss Burdett-Coutts, Flower of Spring and Frank Headley) were tested as the male parents (pollinators) with five different green females. The two type II mutants, Flower of Spring and J.C. Mappin are transmitted alike, but the plasmid of the other three, are significantly different. Dolly Varden is the most successful transmitter of white plastids from the male. The inheritance of flower colour is reviewed. The red and non-red flower colour genes fit expectations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available