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
550200 -- Biochemistry
550300 -- Cytology
551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
ALKALI METAL COMPOUNDS
ANIONS
ANTIBIOTICS
BIOLOGICAL EFFECTS
CARBOXYLIC ACID SALTS
CATIONS
CELL CONSTITUENTS
CELL MEMBRANES
CEREALS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CITRATES
DRUGS
ENZYME INHIBITORS
GRAMINEAE
GRASS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INHIBITION
IONS
MAIZE
MEMBRANE TRANSPORT
MEMBRANES
MITOCHONDRIA
ORGANOIDS
OXYGEN COMPOUNDS
PERMEABILITY
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLANTS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
ROOTS
SULFATES
SULFUR COMPOUNDS
550300 -- Cytology
551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
ALKALI METAL COMPOUNDS
ANIONS
ANTIBIOTICS
BIOLOGICAL EFFECTS
CARBOXYLIC ACID SALTS
CATIONS
CELL CONSTITUENTS
CELL MEMBRANES
CEREALS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CITRATES
DRUGS
ENZYME INHIBITORS
GRAMINEAE
GRASS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INHIBITION
IONS
MAIZE
MEMBRANE TRANSPORT
MEMBRANES
MITOCHONDRIA
ORGANOIDS
OXYGEN COMPOUNDS
PERMEABILITY
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLANTS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
ROOTS
SULFATES
SULFUR COMPOUNDS