Plasticity in Sex Expression of Spinach (Spinacia oleracea) Regenerated from Root Tissues |
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Authors: | Komai Fuminori Masuda Kiyoshi |
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Institution: | (1) Faculty of Agriculture, Saga University, Kuboizumi, Saga 849-0903, Japan;(2) Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-8589, Japan |
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Abstract: | The sex expression of spinach (Spinacia oleracea L.) was modified by a procedure where plants were regenerated from root callus of spinach over three successive generations.
Somatic embryos obtained from the root callus of female or male plants were grown in vitro under long day conditions until flowering. Although the regenerants derived from somatic embryos derived from female plants
were all female at the first generation, few progenies produced male flower organs and expressed gynomonoecy in subsequent
generations. Once the female plants regenerated into gynomonoecy, they never expressed complete femaleness at post generation.
However, the male plants easily altered into andromonoecy at subsequent generations, and several andromonoecious plants showed
the sex reversion at post generation, although this phenomenon did not occur in the female progenies. No absolute sex conversion
was found in both female and male progenies. The plasticity of the sex expressions of spinach indicates that female and male
individuals might essentially be capable of generating both flower organs. |
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Keywords: | dioecy plant regeneration sex expression sex reversion Spinacia orelacea |
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