© 1986 Heron Publishing—Victoria, Canada
Boron and ectomycorrhizal influences on indole-3-acetic acid levels and indole-3-acetic acid oxidase and peroxidase activities
of Pinus echinata Mill. roots
R. J. Mitchell (1), H. E. Garrett (1), G. S. Cox (1) and A. Atalay (1, 2)
1. School of Forestry, Fisheries and Wildlife, University of Missouri, Columbia, Missouri 65211, USA / 2. Environmental Research Institute, Ada, OK 74820, USA / Received November 21, 1985
Summary
The level of indole-3-acetic acid (IAA) in shortleaf pine (Pinus echinata Mill.) roots was increased by inoculation with the ectomycorrhizal fungus Pisolithus tinctorius (Pers.) Coker and Couch. Indole-3-acetic acid oxidase activity was also increased suggesting that the increased level of
IAA was the
result of increased synthesis. Boron fertilization reduced IAA levels in roots inoculated with P. tinctorius but not in noninoculated roots.
