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Maternal plastid inheritance in mirabilis

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MATERNAL PLASTID INHERITANCE IN MIRABILIS MATERNAL PLASTID INHERITANCE IN MIRABILIS  The inheritance of leaf pigmentation, governed by the chloroplast genome, is called plastid inheritance. It was first recorded case of cytoplasmic inheritance, studied independently by Correns(in Mirabilis jalapa) and Baur ( in Pelargonium (Geranium) zonale) as early as in 1908.The distribution of chloroplasts and leaf pigments in Mirabilis varies in different branches. The leaves of some branches may be fully green, those of some others may be patchy and variegated (variegation is the presence of white or pale green spots or patches on a green back-ground), and those of still others may be fully pale or white. Microscopic examination revealed that green areas of the leaves contained chloroplasts and chlorophyll, whereas pale or white areas lacked them. Further studies made it clear that the progeny always inherits the phenotype of the female parent. Correns carried out reciprocal crosses in all possible combinations among the flowers borne on the three kinds of branches. When flowers from a green-leaved branch were used as the female parent, all the progeny were green leaved regardless of th ...
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