Characterization of hydrotropism: The timing of perception and signal movement from the root cap in the agravitropic pea mutant Ageotropum

Charles Stinemetz, Hideyuki Takahashi, Hiroshi Suge

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    In this study, Ageotropum pea mutant was used to determine the threshold time for perception of an osmotic stimulation in the root cap and the time requirement for transduction and transmission of the hydrotropic signal from the root cap to the elongation region. The threshold time for the perception of an osmotic stimulation was compared to current estimates of threshold times for graviperception in roots. The time required for transduction and transmission in the hydrotropic response of ageotropum was compared to the time requirement in the gravity response of Alaska pea roots. We determined that threshold time for perception of an osmotic stimulation in the root cap is very rapid, occurring in less than 2 min following the application of sorbitol to the root cap. Furthermore, a single 5 min exposure of sorbitol to the root cap fully induced a hydrotropic response. We also found that transduction and transmission of an osmotic stimulus requires 90-120 min for movement from the root cap to more basal tissues involved in differential growth leading to root curvature. The very rapid threshold time for perception of root hydrotropism is similar to those times reported for root gravitropism. However, the time required for the transduction and transmission of an osmotic stimulation from the root cap is significantly longer than the time required in gravitropism. These results suggest that there must exist some differences between root hydrotropism and gravitropism in either the rate or mechanisms of transduction and transmission of the tropistic signal from the root cap.

    Original languageEnglish
    Pages (from-to)800-805
    Number of pages6
    JournalPlant and Cell Physiology
    Volume37
    Issue number6
    DOIs
    Publication statusPublished - 1996 Sep

    Keywords

    • Ageotropum
    • Gravitropism
    • Hydrotropism
    • Pisum sativum
    • Signal transduction
    • Signal transmission

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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