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THE PLANT CELL, Vol 7, Issue 8 1319-1331, Copyright © 1995 by American Society of Plant Biologists
Sink Limitation Induces the Expression of Multiple Soybean Vegetative Lipoxygenase mRNAs while the Endogenous Jasmonic Acid Level Remains Low
T. W. Bunker, D. S. Koetje, L. C. Stephenson, R. A. Creelman, J. E. Mullet and H. D. Grimes
Department of Botany, Washington State University, Pullman, Washington 99164-4238
The response of individual members of the lipoxygenase multigene family in
soybeans to sink deprivation was analyzed. RNase protection assays
indicated that a novel vegetative lipoxygenase gene, vlxC, and three other
vegetative lipoxygenase mRNAs accumulated in mature leaves in response to a
variety of sink limitations. These data suggest that several members of the
lipoxygenase multigene family are involved in assimilate partitioning. The
possible involvement of jasmonic acid as a signaling molecule regulating
assimilate partitioning into the vegetative storage proteins and
lipoxygenases was directly assessed by determining the endogenous level of
jasmonic acid in leaves from plants with their pods removed. There was no
rise in the level of endogenous jasmonic acid coincident with the strong
increase in both vlxC and vegetative storage protein VspB transcripts in
response to sink limitation. Thus, expression of the vegetative
lipoxygenases and vegetative storage proteins is not regulated by jasmonic
acid in sink-limited leaves.
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