Plant Physiology 100:1759-1763 (1992)
© 1992 American Society of Plant Biologists
Microbe-Plant Interactions
Exogenous Ethylene Inhibits Nodulation of Pisum sativum L. cv Sparkle 1
Kwang Hoe Lee and
Thomas A. LaRue
Department of Soils, Crops and Atmospheric Sciences, Cornell University, Ithaca, New York,
Boyce Thompson Institute for Plant Research, Ithaca, New York 14853-1801
Exogenous ethylene inhibited nodulation on the primary and lateral roots of pea, Pisum sativum L. cv Sparkle. Ethylene was more inhibitory to nodule formation than to root growth; nodule number was reduced by half with only 0.07 µL/L ethylene applied continually to the roots for 3 weeks. The inhibition was overcome by treating roots with 1 µM Ag+, an inhibitor of ethylene action. Exogenous ethylene also inhibited nodulation on sweet clover (Melilotus alba) and on pea mutants that are hypernodulating or have ineffective nodules. Exogenous ethylene did not decrease the number of infections per centimeter of lateral pea root, but nearly all of the infections were blocked when the infection thread was in the basal epidermal cell or in the outer cortical cells.
1 This research was supported by National Science Foundation grant No. DCB-8616221 to T.A.L.
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