8-Epixanthatin, a light-induced growth inhibitor, mediates the phototropic curvature in sunflower (Helianthus annuus) hypocotyls

Kaori Yokotani-Tomita, Jun Kato, Kosumi Yamada, Seiji Kosemura, Shosuke Yamamura, Johan Bruinsma, Koji Hasegawa

研究成果: Article査読

30 被引用数 (Scopus)

抄録

The distribution of the endogenous auxin-inhibiting substance, 8-epixanthatin, was determined in the lighted and shaded sides of phototropically-stimulated, de-etiolated sunflower (Helianthus annuus L. cv. Taiyo) hypocotyls. From 40 min after the onset of phototropic stimulation, the growth rate at the lighted side was inhibited, whereas that at the shaded side showed no change. In the lighted side, 8-epixanthatin increased by 20 min after the onset of unilateral illumination and, after 40 min, reached a 3-fold larger concentration than that in the shaded side. Unilateral application of 8-epixanthatin suppressed the growth of etiolated hypocotyls at the applied side only, causing the hypocotyls to bend at the site of application. It is concluded that phototropic curvature in sunflower hypocotyls is caused by a lateral gradient of the auxin-inhibiting substance 8-epixanthatin.

本文言語English
ページ(範囲)326-330
ページ数5
ジャーナルPhysiologia Plantarum
106
3
DOI
出版ステータスPublished - 1999 7月

ASJC Scopus subject areas

  • 生理学
  • 遺伝学
  • 植物科学
  • 細胞生物学

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