Abstract
Genetics of flower Colour in winka Catharanthus roseus (L) G. Don were in vestigate by inheritance two types (strains) of plants with different flowers colour were used in this study,pink corolla, and strong violet-purple eye color, and strong pink stem, and dark green leaf lamina (P), and White corolla, and yellow and greenish eye, and strong pink stem, and yellow and green leaf lamina (W) as parents, to determine the number of genes involved. This study was conducted at Horticulture Administration, Ministry of Agriculture, Kassala State, Sudan during for three years the period: Jan 2016 to Oct. 2020. 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 pink corolla, and strong violet-purple eye color, and strong pink stem, and dark green leaf lamina (P) is incompletely dominant over that for White corolla, and yellow and greenish eye, and strong pink stem, and yellow and green leaf lamina (W). The reciprocal crosses gave the same results indicating no role of cytoplasmic genes in the inheritance of these colors.
Highlights
AllF1 plants from the cross pink corolla and strong violet -purple eye color, strong pink stem, and dark green leaf lamina (P) x White corolla, yellow and greenish eye color, green stem, and yellow and green leaf lamina (W) and the reciprocal cross white corolla and yellow and greenish eye color x pink corolla and strong violet eye color (P) had Light pink corolla, pale red eye flower, pale pink stem, and pale green leaf lamina (Li.P), the colour was slightly light pink indicating that the pink corolla and strong violet -purple eye color, strong pink stem, and dark green leaf lamina (P) trait is dominant over the White corolla, yellow and greenish eye color, green stem, and yellow and green leaf lamina (W)
A total of 485 F2 plants were scored for flower colour. 125 plants had pink corolla, strong violet-purple eye color, strong pink stem, and dark green leaf lamina (F2 P) like the parental stock, 227 plants had Light pink corolla, pale red eye flowers, and pale pink stem, and pale green leaf lamina (F2 Li.P) like the F1 plants and 133 plants had White corolla, yellow and greenish eye color, green stem, and yellow and green leaf lamina (F2 W)
This study show that the F1 plants produced from crossing of pink flower coloured and red eye plants, with white flowered and yellow plants, were all with light pink flower coloured and pale red eye
Summary
Catharanthus roseus (L.) is an important medicinal plant of the family Apocynaceae which contains a virtual cornucopia of useful alkaloids, used in diabetes, blood pressure, asthma, constipation, and cancer and menstrual problem. There are about two common cultivars of C. roseus which is named on the basis of their flower colour that is the pink flowered “Rosea” and the white flowers “Alba”. Catharanthus roseus which is pridely known as the Madagascar periwinkle is found to be a species of Catharanthus native and endemic to Madagascar Monika (2013) [3]. Corresponding author: Awad Hamza Abdelmageed Department of Biology, University of Kassala P.
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