8. オーキシンによるチューリップ花茎の伸長促進 : 花茎節間における物質分配に対するオーキシンの影響

概要

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Mechanism of indole-3-acetic acid (IAA) to induce stem growth in tulips (Tulipa gesneriana L. cv. Apeldoorn) was studied. The growth of stem with or without cooled bulbs was very small when lanolin was applied to the cut surface of the top internode of shoot, of which all leaves and flower bud were removed. IAA (0.1%, w/w) applied as a lanolin paste instead of flower bud extremely promoted the growth of stem with or without cooled bulbs. More conspicuous effect of IAA was observed in the stem with cooled bulbs. The fresh weight of stem segments treated with IAA was much higher than that of untreated ones although the total dry weight of stem segments was almost similar. Dry weight of the first internode decreased, whereas that of the upper internodes increased, and IAA substantially enhanced these changes in dry weight, showing that dry materials are essential factors for IAA-induced growth of the stem. These results suggest that IAA enhances translocation of solutes to stem intenode elongating actively from other part of shoots and/or bulbs, in which solutes act as a driving force in osmoregulation. Further studies of IAA on osmoregulation and solute translocation as well as mechanical properties of cell walls will be required.
植物化学調節学会の論文
2005-10-13