Growth and Flowering Characteristics of Yellow-flowered New Summer-to-autumn-flowering Chrysanthemum Cultivar ‘Natsubiyori’ with High-temperature Tolerance

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  • 高温耐性を有する夏秋ギクの黄色新品種‘夏日和’の生育・開花特性
  • コウオン タイセイ オ ユウスル ナツ シュウ ギク ノ キイロ シン ヒンシュ ‘ ナツ ヒヨリ ' ノ セイイク ・ カイカ トクセイ
  • Growth and Flowering Characteristics of Yellow-flowered New Summer-to-autumn-flowering Chrysanthemum Cultivar ^|^lsquo;Natsubiyori^|^rsquo; with High-temperature Tolerance

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Abstract

The chrysanthemum cultivar ‘Natsubiyori’ was raised by cross combinations between a summer-to-autumn flowering chrysanthemum line, Seiun 96-2, with white flower heads as the seed parent, and other summer-to-autumn flowering lines with white flower heads as pollen parents. The first cultivar generated with yellow flower heads has no malformed flowers (i.e., proliferate flowers) when grown under high-temperature conditions in the summer, and can be shipped from June to September using a long-day treatment with incandescent lamps. Because the plant consists of a rosette habit, flowering was faster and the cut-flower length was longer when stock plants were exposed to natural low temperatures from late October until early January compared with stock plants grown at a constant temperature of 15°C from late October until early February. The number of days to flowering after the end of the long-day treatment was 63–78 according to the cropping type. The optimum day length for flowering was 12 hours, and maintaining plants in the shade was appropriate for transport during July to September.<br>

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