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Ca 2+ and H + Ion Fluxes near the Surface of Gravitropically Stimulated Phycomyces Sporangiophore
Author(s) -
ŽIVANOVIĆ BRANKA
Publication year - 2005
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1342.074
Subject(s) - phycomyces , phycomyces blakesleeanus , hypha , biophysics , ion , sporangium , chemistry , botany , biology , physics , spore , biochemistry , mutant , gene , organic chemistry
A bstract : The single‐celled fungus Phycomyces blakesleeanus forms vertically oriented sporangiophores from hyphae, which display a negative gravitropic response. Longitudinal growth and gravitropic bending of these sporangiophores were measured with noninvasive H + and Ca 2+ ion‐selective microelectrode measurements. The directions of H + and Ca 2+ fluxes, recorded at different locations of sporangiophores, were opposite when the sporangiophores were kept in vertical position. Ca 2+ fluxes were in most experiments positive (efflux), while H + fluxes were negative (influx). The direction of ion fluxes depended on developmental stage of sporangiophores and changed with gravistimulation.