期刊
PLANT PHYSIOLOGY
卷 149, 期 3, 页码 1593-1600出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.108.133884
关键词
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资金
- Deutsche Forschungsgemeinschaft [Fe 213/15-1, Fe 213/15-2]
- Max Planck Society
Systemic signaling was investigated in both a dicot (Vicia faba) and a monocot (Hordeum vulgare) plant. Stimuli were applied to one leaf (S-leaf), and apoplastic responses were monitored on a distant leaf (target; T-leaf) with microelectrodes positioned in substomatal cavities of open stomata. Leaves that had been injured by cutting and to which a variety of cations were subsequently added caused voltage transients at the T-leaf, which are neither action potentials nor variation potentials: with respect to the cell interior, the initial polarity of these voltage transients is hyperpolarizing; they do not obey the all-or-none rule but depend on both the concentration and the type of substance added and propagate at 5 to 10 cm min(-1). This response is thought to be due to the stimulation of the plasma membrane H+-ATPase, a notion supported by the action of fusicoccin, which also causes such voltage transients to appear on the T-leaf, whereas orthovanadate prevents their propagation. Moreover, apoplastic ion flux analysis reveals that, in contrast to action or variation potentials, all of the investigated ion movements (Ca2+, K+, H+, and Cl-) occur after the voltage change begins. We suggest that these wound-induced system potentials represent a new type of electrical long-distance signaling in higher plants.
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