Heterotic behaviour of the transmembrane electric potential difference in some maize hybrid-parents combinations

Marre, M.T.; Romani, G.

Plant Science Letters 27(3): 265-273


DOI: 10.1016/0304-4211(82)90129-8
Accession: 001084954

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The transmembrane electrical potential difference (PD) of cortical cells in subapical root segments from three inbred lines and their hybrids was investigated under various experimental conditions. The PD values of the hybrids were significantly greater than those of their parents. In B73 X Mo17 and B37 X Mo17 this was shown not to be a consequence of increased permeability to K+. In B73 X Mo17, treatment with arsenate, blocking ATP synthesis, or with carbonylcyanid-p-trifluorometoxyphenylhydrazon (FCCP), uncoupling phosphorylation and making cell membranes permeable to proteins, completely suppressed differences in PD between the hybrid and its parents. It is suggested that the higher PD value of the hybrid depends on the higher activity of the ATP-driven proton pump mechanism. When electrogenic proton extrusion in the root segments was stimulated by treatment with fusicoccin, the PD values of the parent lines rose to a common value and the difference between B73 X Mo17 and its parents disappeared. This suggests that the higher PD value of the hybrid depends on regulation of active electrogenesis by a higher rate of operation of certain internal factors in the hybrid than in its parents.