Promotion of Flowering in Stock (Matthiola incana (L.) R. Br.) by Prohexadione-calcium in Plastic-film Greenhouse Conditions.

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  • 圃場条件下におけるプロヘキサジオンカルシウムによるストックの開花促進

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Abstract

Promotive effects of prohexadione-calcium (PCa) on vegetative growth and the time of anthesis (flowering) of Matthiola incana (L.) R. Br. in plastic-film greenhouse conditions were investigated. Low temperature requirement for flowering is more stringent for late flowering cultivars than for early flowering cultivars. The flowering season of 'Sourei' (extremely early), 'Pearl Pink' (early) and 'Fujimusume' (mid) was significantly accelerated in PCa-10, PCa-100 and GA3-100ppm treatments compared to that in the control. Although GA3 treatment significantly decreased spike length and stem diameter, decrease of spike length was not observed and that of stem diameter was not significant in PCa-10 and 100ppm treatments. The flowering time of 'Banrei' (late) was promoted in PCa-100 and PCa-1000ppm treatments. High dose of PCa treatment decreased length of cut stem. These results indicate that accelerating flowering time in summer sown M. incana is possible by PCa treatment in the plastic-film greenhouse conditions.

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