Abstract
Genetics of flower Color in winka Catharanthus roseus (L) G.Don were investigate by inheritance two types (strains) of plants with different flowers color were used in this study, violet (V) and White (W) color as parents, to determine the number of genes involved. This study was conducted at the Department of Chemistry & Biology at the Faculty of Education, University of Kassala, kassala State, Sudan, during: the autumn, seasons for two years 2010- 2012. First the two parents were covered to ensure self pollination. Reciprocal cross has been carried out between the two inbred parents. The study showed that a single pair of genes is probably involved in flower colour and that gene for violet color is incompletely dominant over that for white color. The reciprocal crosses gave the same results indicating no role of cytoplasmic genes in the inheritance of these colors.
Highlights
IntroductionSimmond (1960), found that the flowers of periwinkle, Lochnera (Vinca) rosea (L.) contained a pigment of which the aglycone corresponded with none of the common types recognized in other plants [3]
All F1plants from the cross violet xwhite and the reciprocal cross white xviolet had violet flowers, the colour was slightly light violet indicating that the violet colour trait is dominant over the white colour
A total of 195 F2 plants were scored for flower colour. 60 plants had violet flower color like the parental stock, 82 plants had light violet color like the F1 plants and 53 plants had white flowers
Summary
Simmond (1960), found that the flowers of periwinkle, Lochnera (Vinca) rosea (L.) contained a pigment of which the aglycone corresponded with none of the common types recognized in other plants [3]. Flory (1944), working in U.S.A, recognised three phenotypes which, from his descriptions and from his mention of forms in the "light pink range ", Pink(V), Red eye(E) and White (W) [5]. The most commonly observed are pink, white corolla and red eye, and white, Flory (1944) attributed these three corolla colors to the epistatic interaction of two genes, R and W, with the R-W-genotype being pink, R-ww being red-eyed, and rrW and rrww being white flowered. Simmonds (1960) implicated two additional genes, A and B in the determination of flower colour, with A being complementary to R, A and R are necessary for the production of colored flower, without both which flowers
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