Responses of Avena coleoptiles to suboptimal fusicoccin: kinetics and comparisons with indoleacetic acid

Journal Article · Tue Sep 01 00:00:00 EDT 1981 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.68.3.543· OSTI ID:6256146

Rubinstein, B ^[1]; Cleland, R E

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1. Univ. of Massachusetts, Amherst

Proton excretion induced by optimal concentrations of indoleacetic acid (IAA) and fusicoccin (FC) differs not only in maximum rate of acidification but also in the lag before onset of H/sup +/ excretion and in sensitivity to cycloheximide. Because these differences might simply be a consequence of the difference in rate of proton excretion, FC and IAA have now been compared using oat coleoptiles (cv. Victory) under conditionns where the rates of acidification are more similar. As the concentration of FC is reduced, the rate of H/sup +/ excretion decreases, the final equilibrium pH increases, and the lag before detectable acidification increases up to 7-fold. An extended lag also occurs, upon reduction of FC levels, in the hyperpolarization of the membrane potential, before enhancement of O/sub 2/ uptake and before the increased rate of Rb/sup +/ uptake. The insensitivity of FC-induced H/sup +/ excretion to cycloheximide, as compared with the nearly complete inhibition of this auxin effect by cyclohexi the most important of its consequences are considered. A new mechanism of ''anomalous'' component formation of galactic cosmic rays in to determine the quantity andparently related to depositional/diagenetic trends. At normal depths of burial, Mesozoic-Paleozoic units are thermally mature; older Paleo of anomalous stars with high L lepton content and the connection of cosmic ..gamma..-quanta background with L anti L annihilation. Consequences of elementary particles models with spontaneously symmetry breaking are considered for cosmology in the vicinity of singularity. Different hypotheses of appearance of the observed baryon excess over antibaryons in the Universe are discussed.

• DOE Contract Number: AT06-76RL73019
• OSTI ID: 6256146
• Journal Information: Plant Physiol.; (United States), Vol. 68:3
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
AUXINS
BIOCHEMICAL REACTION KINETICS
PROTONS
EXCRETION
COLEOPTILE
CYCLOHEXIMIDE
MEMBRANE TRANSPORT
OATS
PH VALUE
ANTI-INFECTIVE AGENTS
ANTIBIOTICS
BARYONS
CEREALS
CLEARANCE
DRUGS
ELEMENTARY PARTICLES
FERMIONS
FUNGICIDES
GRAMINEAE
GRASS
HADRONS
KINETICS
NUCLEONS
PESTICIDES
PLANT GROWTH REGULATORS
PLANTS
REACTION KINETICS
550200* - Biochemistry
551000 - Physiological Systems