Inhibition of ethylene production by cobaltous ion. [Beans, apples]
The effect of Co/sup 2 +/ on ethylene production by mung bean (Phaseolus aureus Roxb.) and by apple tissues was studied. Co/sup 2 +/, depending on concentrations applied, effectively inhibited ethylene production by both tissues. It also strongly inhibited the ethylene production induced by IAA, kinetin, IAA plus kinetin, Ca/sup 2 +/, kinetin plus Ca/sup 2 +/, or Cu/sup 2 +/ treatments in mung bean hypocotyl segments. While Co/sup 2 +/ greatly inhibited ethylene production, it had little effect on the respiration of apple tissue, indicating that Co/sup 2 +/ does not exert its inhibitory effect as a general metabolic inhibitor. Ni/sup 2 +/, which belongs to the same group as Co/sup 2 +/ in the periodic table, also markedly curtailed both the basal and the induced ethylene production by apple and mung bean hypocotyl tissues. In a system in which kinetin and Ca/sup 2 +/ were applied together, kinetin greatly enhanced Ca/sup 2 +/ uptake, thus enhancing ethylene production. Co/sup 2 +/, however, slightly inhibited the uptake of Ca/sup 2 +/ but appreciably inhibited ethylene production, either in the presence or in the absence of kinetin. Tracer experiments using apple tissue indicated that Co/sup 2 +/ strongly inhibited the in vivo conversion of L-(U--/sup 14/C)methionine to /sup 14/C-ethylene. These data suggested that Co/sup 2 +/ inhibited ethylene production by inhibiting the conversion of methionine to ethylene, a common step which is required for ethylene formation by higher plants. Co/sup 2 +/ is known to promote elongation, leaf expansion, and hook opening in excised plant parts in response to applied auxins or cytokinins.Since ethylene is known to inhibit those growth phenomena, it is suggested that Co/sup 2 +/ exerts its promotive effect, at least in part, by inhibiting ethylene formation.
- Research Organization:
- Univ. of California, Davis
- OSTI ID:
- 7212921
- Journal Information:
- Plant Physiol.; (United States), Vol. 58:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
APPLES
BEANS
COBALT IONS
BIOLOGICAL EFFECTS
ETHYLENE
PRODUCTIVITY
INHIBITION
AUXINS
CALCIUM IONS
CARBON 14
COPPER IONS
GROWTH
KINETICS
LABELLING
LEAVES
METABOLISM
METHIONINE
NICKEL IONS
PHASEOLUS
PLANTS
RESPIRATION
UPTAKE
VALENCE
ALKENES
AMINO ACIDS
ATOMIC IONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOMASS
CARBON ISOTOPES
CARBOXYLIC ACIDS
CHARGED PARTICLES
ENERGY SOURCES
EVEN-EVEN NUCLEI
FOOD
FRUITS
HYDROCARBONS
IONS
ISOTOPES
LEGUMINOSAE
LIGHT NUCLEI
LIPOTROPIC FACTORS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PLANT GROWTH REGULATORS
RADIOISOTOPES
RENEWABLE ENERGY SOURCES
VEGETABLES
YEARS LIVING RADIOISOTOPES
550201* - Biochemistry- Tracer Techniques