ツバキ‘土佐有楽’の芽の形成に関する形態学的研究

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タイトル別名
  • Morphological Studies on the Bud Formation in Camellia wabisuke 'Tosauraku'.
  • ツバキ トサウラク ノ メ ノ ケイセイ ニ カンスル ケイタイガクテキ

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The bud formation of six-year-old plants in Camellia wabisuke 'Tosauraku', was investigated with a stereoscopic binocular microscope and a scanning electronic microscope (SEM).<BR>1. Terminal buds and upper axillary buds develop into vegetative buds, whereas, the lower axillary buds remain undifferentiated and dormant. Flower buds are the axillary buds of outer bracts and prophylls of vegetative buds.<BR>2. The terminal buds are composed of: a) two bracts which are initiated as hypsophylls just before budbreak: b) five outer scales which differentiate between May and June: c) four inner scales which are differentiated between June and July: and d) seven leaf primordia which become visible and continue to differentiate from October through February. Some terminal buds, which form no outer scales, four inner scales and six leaf primordia from June through July, develop into summer shoots in August. The terminal buds of the summer shoots formed between August through March show structures similar to those of spring shoots.<BR>3. Axillary bud primordia are initiated, beginning in November, the various organs continue to differentiate in the axil of a developing leaf primordia through March. Two prophylls are formed by March, the axillary buds continue to develop after April, but some of them remain undifferentiated after outer scale formation.<BR>4. No further development of vegetative buds accompanied with a flower bud occurred after October.<BR>5. Axillary buds, initiated in the axils of outer bracts of terminal buds in March and in the prophylls of distal axillary buds on a current shoot in April, develop into floral buds. Floral buds consist of: a) six to seven bracts which differentiate from May to June: b) five to six sepals, and c) five petals which were initiated in July and continued to develop through August. Numerous stamens and a pistil consisting of three fused carpels defferentiate beginning in September. Pollen and ovules differentiated in October. The flowers bloom from February through March.

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 61 (4), 885-893, 1993

    一般社団法人　園芸学会

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