Genetic Evidence That the Red-Absorbing Form of Phytochrome B Modulates Gravitropism in Arabidopsis thaliana | Zendy

Emmanuel Liscum | Zendy; Roger P. Hangarter | Zendy

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Genetic Evidence That the Red-Absorbing Form of Phytochrome B Modulates Gravitropism in Arabidopsis thaliana

Author(s) -

Emmanuel Liscum,

Roger P. Hangarter

Publication year - 1993

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.103.1.15

Subject(s) - gravitropism , phytochrome , hypocotyl , arabidopsis thaliana , arabidopsis , biology , far red , mutant , botany , darkness , phytochrome a , phototropism , biophysics , red light , biochemistry , physics , blue light , gene , optics

Hypocotyls of dark-grown Arabidopsis seedlings exhibit strong negative gravitropism, whereas in red light, gravitropism is strongly reduced. Red/far-red light-pulse experiments and analysis of specific phytochrome-deficient mutants indicate that the red-absorbing (Pr) form of phytochrome B regulates normal hypocotyl gravitropism in darkness, and depletion of Pr by photoconversion to the far-red-absorbing form attenuates hypocotyl gravitropism. These studies provide genetic evidence that the Pr form of phytochrome has an active function in plant development.

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