Plant Physiology 96:130-136 (1991)
© 1991 American Society of Plant Biologists
Molecular Biology and Gene Regulation
Nitrogen and Methyl Jasmonate Induction of Soybean Vegetative Storage Protein Genes 1
Paul E. Staswick,
Jing-Feng Huang and
Yoon Rhee
Department of Agronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0915
Vegetative storage protein (VSP) and VSP mRNA levels in soybean (Glycine max) leaves correlated with the amount of NH4NO3 provided to nonnodulated plants. The mRNA level declined as leaves matured, but high levels of N delayed the decline. This is consistent with the proposed role for VSP in the temporary storage of N. Wounding, petiole girdling, and treatment with methyljasmonate (MeJA) increased VSP mRNA in leaves 24 hours after treatment. The magnitude of the response depended on leaf age and N availability. N deficiency essentially eliminated the response to wounding and petiole girdling. MeJA was almost as effective in N-deficient plants as in those receiving abundant N. Inhibitors of lipoxygenase, the first enzyme in the jasmonic acid biosynthetic pathway, blocked induction by wounding and petiole girdling but not by MeJA. This supports a role for endogenous leaf jasmonic acid (or MeJA) in the regulation of VSP gene expression.
1 This work was supported by a grant from the U.S. Department of Agriculture, Competitive Research Grants Office (87-CRCR-1-2300). This is paper No. 9391, Journal Series, Nebraska Agricultural Research Division.
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