Effect of Minimum Air Temperature on Occurrence of Abnormal Inflorescence and Cut Flower Quality in <i>Gypsophila paniculata</i> ‘Altair’

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  • Yamaguchi Norihito
    Graduate School of Environmental and Life Science, Okayama University
  • Goto Tanjuro
    Graduate School of Environmental and Life Science, Okayama University
  • Kobiki Kayoko
    Graduate School of Environmental and Life Science, Okayama University
  • Otani Shoko
    Graduate School of Environmental and Life Science, Okayama University
  • Tanaka Yoshiyuki
    Graduate School of Environmental and Life Science, Okayama University
  • Yoshida Yuichi
    Graduate School of Environmental and Life Science, Okayama University

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Other Title
  • 最低気温がシュッコンカスミソウ‘アルタイル’の形態異常花序発生および切り花形質に及ぼす影響
  • サイテイ キオン ガ シュッコンカスミソウ ' アルタイル ' ノ ケイタイ イジョウ カ ジョ ハッセイ オヨビ キリバナ ケイシツ ニ オヨボス エイキョウ
  • Effect of Minimum Air Temperature on Occurrence of Abnormal Inflorescence and Cut Flower Quality in Gypsophila paniculata ‘Altair’

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Abstract

This study investigated the effect of the minimum air temperature on the occurrence of abnormal inflorescences in Gypsophila paniculata ‘Altair’. Abnormal inflorescences could be classified into three types: Type 1 (short flower stalk), Type 2 (coalescent two-flower stalk), and Type 3 (looping and irregular flower stalk). Abnormal inflorescences increased from early winter to early spring. Type 1 and 2 inflorescences could be observed at a constant rate, regardless of the flowering time, whereas markedly abnormal inflorescences (Type 3) increased significantly in March. Subsequent investigation of the effect of the minimum air temperature (7, 11, and 15°C) revealed that Type 3 increased at a lower air temperature; however, a lower air temperature improved the volume, length, and weight of cut flowers. In conclusion, a minimum air temperature of 11°C may be optimum to produce high-quality cut flowers of ‘Altair’. The cumulative number of chill hours (<9°C) from pinching to budding was more strongly correlated with the incidence of Type 3 abnormalities than that from budding to flowering. Thus, the occurrence of Type 3 abnormalities is affected by the minimum air temperature from pinching to budding.

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