Intensity of hydrostimulation for the induction of root hydrotropism and its sensing by the root cap

Hideyuki Takahashi, T. K. SCOTT

研究成果: Article査読

57 被引用数 (Scopus)

抄録

Roots of Pisum sativum L. and Zea mays L. were exposed to different moisture gradients established by placing both wet cheesecloth (hydrostimulant) and saturated aqueous solutions of various salts in a closed chamber. Atmospheric conditions with different relative humidity (RH) in a range between 98 and 86% RH were obtained at root level, 2 to 3mm from the water‐saturated hydrostimulant. Roots of Silver Queen corn placed vertically with the tips down curved sideways toward the hydrostimulant in response to approximately 94% RH but did not respond positively to RH higher than approximately 95%. The positive hydrotropic response increased linearly as RH was lowered from 95 to 90%. A maximum response was observed at RH between 90 and 86%. However, RH required for the induction of hydrotropism as well as the responsiveness differed among plant species used; gravitropically sensitive roots appeared to require a somewhat greater moisture gradient for the induction of hydrotropism. Decapped roots of corn failed to curve hydrotropically, suggesting the root cap as a major site of hydrosensing.

本文言語English
ページ(範囲)99-103
ページ数5
ジャーナルPlant, Cell & Environment
16
1
DOI
出版ステータスPublished - 1993 1月 1

ASJC Scopus subject areas

  • 生理学
  • 植物科学

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