Importance of Line Selection to Improve Uniformity of Flowering Period of Small-Flowered Spray-Type Chrysanthemum Flowering in Summer-to-autumn

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  • Naka Terufumi
    Nara Prefectural Agricultural Research and Development Station Graduate School of Environmental and Life Science, Okayama University
  • Sumikawa Yuka
    Nara Prefectural Agricultural Research and Development Station
  • Maeda Shigeichi
    Nara Prefectural Agricultural Research and Development Station
  • Goto Tanjuro
    Graduate School of Environmental and Life Science, Okayama University

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Other Title
  • 夏秋小ギクの開花斉一性向上における親株系統選抜の重要性
  • ナツ シュウ ショウギク ノ カイカ セイイツ セイコウ ジョウ ニ オケル オヤカブ ケイトウ センバツ ノ ジュウヨウセイ

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Abstract

In order to improve the uniformity in the flowering period of summer-to-autumn flowering-type chrysanthemums, the influence of a previous history of cuttings on flowering was investigated in Exp. 1 using two cultivars, ‘Minoru’ and ‘Okinamaru’. The flowering period was markedly influenced by individual mother stocks and the node number where the cuttings were taken from. In Exp. 2, paying attention to the difference between mother stocks, the possibility of line selection was examined to improve the uniformity of flowering. In the first year, using three cultivars, ‘Okinamaru’, ‘Hiroshimabeni’, and ‘Kosuzu’, 1-5 lines of each cultivar were chosen as earlier or later flowering lines. In the next year, these selected lines were cultivated under the condition of rain-protected culture. In comparison with the control, the flowering periods became shorter and the coefficient of variance in the flowering became smaller. The earlier or later flowering characters of these selected lines were replicated in the examination under the condition of an open field in another year. In the supplementary test without training, the flowering period of these selected lines became shorter and the ratio of cut flowers which bloomed for the peak seven days increased.

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