Early Gravi-Electrical Responses in Bean Epicotyls | Zendy

H. Shigematsu | Zendy; Kiyoshi Toko | Zendy; Toshio Matsuno | Zendy; K. Yamafuji | Zendy

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Early Gravi-Electrical Responses in Bean Epicotyls

Author(s) -

H. Shigematsu,

Kiyoshi Toko,

Toshio Matsuno,

K. Yamafuji

Publication year - 1994

Publication title -

plant physiology

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.105.3.875

Subject(s) - gravitropism , etiolation , curvature , biophysics , phototropism , darkness , botany , biology , chemistry , physics , optics , biochemistry , mathematics , geometry , blue light , arabidopsis , gene , mutant , enzyme

The relationship between gravitropism and surface electrical potentials was studied using etiolated epicotyls of adzuki bean (Phaseolus angularis). Early downward curvature (or transient positive gravitropic response) was observed about 1 min after gravistimulation. The downward curvature was closely related to the speed of the subsequent upward curvature. Surface electrical potentials decreased cooperatively in a limited region on the upper side within only 0.5 to 2 min. This is the earliest event found so far to follow gravistimulation of intact epicotyls. The rapid change in the potential had a high correlation with the early downward curvature and also the subsequent negative gravitropism. It is suggested that the rapid potential change plays an important role in gravity perception.

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