Inhibition of ethylene production by cobaltous ion. [Beans, apples]

Journal Article · Thu Jul 01 04:00:00 EDT 1976 · Plant Physiol.; (United States)

OSTI ID:7212921

Lau, O L; Yang, S F

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), Journal Name: Plant Physiol.; (United States) Vol. 58:1; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALKENES
AMINO ACIDS
APPLES
ATOMIC IONS
AUXINS
BEANS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BIOMASS
CALCIUM IONS
CARBON 14
CARBON ISOTOPES
CARBOXYLIC ACIDS
CHARGED PARTICLES
COBALT IONS
COPPER IONS
ENERGY SOURCES
ETHYLENE
EVEN-EVEN NUCLEI
FOOD
FRUITS
GROWTH
HYDROCARBONS
INHIBITION
IONS
ISOTOPES
KINETICS
LABELLING
LEAVES
LEGUMINOSAE
LIGHT NUCLEI
LIPOTROPIC FACTORS
METABOLISM
METHIONINE
NICKEL IONS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHASEOLUS
PLANT GROWTH REGULATORS
PLANTS
PRODUCTIVITY
RADIOISOTOPES
RENEWABLE ENERGY SOURCES
RESPIRATION
UPTAKE
VALENCE
VEGETABLES
YEARS LIVING RADIOISOTOPES