On the Reversible ATPase of Plant Mitochondria

Hanson, James A.

doi:10.1007/978-3-642-65986-7_43

Membrane Transport in Plants 1974

DOI: 10.1007/978-3-642-65986-7_43

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On the Reversible ATPase of Plant Mitochondria

James A. Hanson¹

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“…Work by Poole (Can. J. Botany 52: 1023, 1974 with washed beet root slices shows that increasing H+ efflux with increasing pH is paralleled by increasing Ki-influic and increasing PD. Our confirmation here is not yet complete but it does appear that the amount of Hi-extruded is related to the amozmt of.K+ taken up, and thus we are dealing with an energy-liflced H+/KE exchange mechanism which somehow enhances PD, The action of DTE is in opposition to this system, but it cannot be simply a penmeability change because at law pH (high in/out H+ gradient) it has little effect.…”

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Development and function of membrane systems in plant tissue. Annual progress report, 15 July 1974--14 July 1975. [Ion transport in corn roots]

Arntzen¹

1975

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I. Research accamplishments Rese_Arch an mitochondrial ion transport has been stopped pending the return of Professor Hanson. Research on the development of enhanced ion transport in corn root tissue due to "washing" has continued. A. Mr. Willy Lin has continued the study of enhanced cell potentials developed with washing by investigating whether there are corresponding changes in cell resistance. (The terms "cell potential" and "cell resistance" are used since there parameters are measured between the vacuole. and the external medium, and thus refer to measurements across both .the vacuolar and cell membranes.) Washing proves to be without effect on resistance, which falls in the range of 11-13 megaohms in both fresh and 4 hour washed root tissue. There is thus no evidence to support the hypothesis that the increase in electrical potential is due to increased permeability, (Pk). Rather, the increased PD probably arises from energy-linked electrogenic transport, as previously deduced from the collapse of the increased PD with the uncoupler, FCCP (Plant Physiol. 54: 799, 1974). .-If enhanced electrogenic transport is responsible for the increase in PD with washing, the next question becomes, "what ion is being transported?". Mitchell's chemiosmotic hypothesis proposes that protan efflux pumping is responsible for salt transport; that is, an electrochemical gradient of protons-established by respiratory "loops" or K[P hydrolysis provides the potential for ion transport. Energy-linked proton efflux could then account for the electrogenic. transport component of PD. t However, we observed that net protan efflux was high in fresh tissue * reduced.

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confidence: 93%

Development and function of membrane systems in plant tissue. Annual progress report, 15 July 1974--14 July 1975. [Ion transport in corn roots]

Arntzen¹

1975

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On the Reversible ATPase of Plant Mitochondria

Cited by 1 publication

References 12 publications

Development and function of membrane systems in plant tissue. Annual progress report, 15 July 1974--14 July 1975. [Ion transport in corn roots]

Development and function of membrane systems in plant tissue. Annual progress report, 15 July 1974--14 July 1975. [Ion transport in corn roots]

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