Abstract 5802 from Intl. Bot. Congress 1999

ibclogo XVI International Botanical Congess

Abstract Number: 5802
Poster No. = 2160

EXOGENOUS ETHYLENE ALTERS THE MORPHOLOGY OF ARBUSCULAR MYCORRHIZA IN PEA.

R.D. Geil, R.L. Peterson and F.C. Guinel# (*Dept. of Botany, University of Guelph, Guelph, ON, CAN, N1G 2W1, #Dept. of Biology, Wilfrid Laurier University, Waterloo, ON, CAN, N2L 3C5)

The objective of this study is to investigate a role for ethylene, a gaseous phytohormone, in the formation of arbuscular mycorrhizae (AM). Ethylene (~ 0.1 ppm) applied to the rhizosphere of Pisum sativum L. cv Sparkle for 25 days reduced arbuscular colonization by Glomus aggregatum. Different microscopy techniques (light, confocal, scanning electron) were used to evaluate the effects of this hormone on AM formation. Extraradical hyphae exhibited vigorous growth in response to the ethylene treatment. The rate of appressorium formation was not significantly altered in ethylene- reated roots, however, the appressoria formed were irregular in shape, exhibiting considerable branching. The longitudinal spread of intraradical hyphae was limited and few arbuscules formed.

HTML-Version made 7. July 1999 by Kurt Stüber

EXOGENOUS ETHYLENE ALTERS THE MORPHOLOGY OF ARBUSCULAR MYCORRHIZA IN PEA.

R.D. Geil*, R.L. Peterson* and F.C. Guinel# (*Dept. of Botany, University of Guelph, Guelph, ON, CAN, N1G 2W1, #Dept. of Biology, Wilfrid Laurier University, Waterloo, ON, CAN, N2L 3C5)

R.D. Geil, R.L. Peterson and F.C. Guinel# (*Dept. of Botany, University of Guelph, Guelph, ON, CAN, N1G 2W1, #Dept. of Biology, Wilfrid Laurier University, Waterloo, ON, CAN, N2L 3C5)