期刊
PLANT AND CELL PHYSIOLOGY
卷 44, 期 5, 页码 527-533出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcg070
关键词
action potential; calcium channels; cold-induced potential changes; liverwort Conocephalum conicum; voltage transient
Intracellular microelectrode measurements revealed that the liverwort Conocephalum conicum generates all-or-none action potentials (APs) in response to a sudden temperature drop. In plants with anion and potassium conductance blocked, dose-dependent voltage transients (VTs) were evoked by cold stimuli. These VTs did not propagate. When the external concentration of Ca2+ was decreased or calcium channel inhibitors (La3+, Gd3+, verapamil, Mg2+, Mn2+) were used, inhibition of VTs was observed. Amplitudes of both At's and VTs grew when Sr2+ ions, known to release calcium from internal stores, were added to the medium. Neomycin, which suppresses phospholipase C and indirectly affects inositol triphosphate formation, caused substantial inhibition of both APs and VTs. It is concluded that a temperature drop elucidated membrane potential changes due to calcium influx both from external and internal stores.
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