Development and function of membrane systems in plant tissue. [Corn roots and mitochondria]
Progress is reported in the investigation of ion transport mechanisms in corn roots and mitochondria. Results indicate that with mitochondria the H/sup +//K/sup +/ antiporter is active in passive influx of KCl, and that the Cl/sup -/ gradient drives the swelling. Citrate uptake by corn mitochondria requires phosphate or sulfate as an activating cofactor, but malate does not appear to be required. In the root investigations, fusicoccin was found to relieve the block in H/sup +/ efflux pumping caused by protein synthesis inhibitors. Fusicoccin also repolarizes the cells. Inhibition of H/sup +/ efflux by the H/sup +/ channel inhibitors, oligomycin and DCCD, can also be relieved or bypassed by fusicoccin. Nigericin, a H/sup +//K/sup +/ exchanging antibiotic, will give partial release of the H/sup +/ efflux block caused by protein synthesis inhibitors, repolarizing the cells, but in no other respect does it resemble fusicoccin. It will not restore the K/sup +/ influx or growth inhibitions resulting from treatment with protein synthesis inhibitors.
- Research Organization:
- Illinois Univ., Urbana (USA). Dept. of Botany
- DOE Contract Number:
- AS02-76EV00790
- OSTI ID:
- 5263701
- Report Number(s):
- DOE/EV/00790-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANIONS
MEMBRANE TRANSPORT
ANTIBIOTICS
BIOLOGICAL EFFECTS
CATIONS
CELL MEMBRANES
PERMEABILITY
CITRATES
ENZYME INHIBITORS
INHIBITION
CHLORINE COMPOUNDS
HYDROGEN COMPOUNDS
MAIZE
MITOCHONDRIA
PHOSPHATES
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
ROOTS
SULFATES
ALKALI METAL COMPOUNDS
CARBOXYLIC ACID SALTS
CELL CONSTITUENTS
CEREALS
CHARGED PARTICLES
CHLORIDES
DRUGS
GRAMINEAE
GRASS
HALIDES
HALOGEN COMPOUNDS
IONS
MEMBRANES
ORGANOIDS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PLANTS
SULFUR COMPOUNDS
551000* - Physiological Systems
550300 - Cytology
550200 - Biochemistry