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THE PLANT CELL, Vol 3, Issue 3 299-308, Copyright © 1991 by American Society of Plant Biologists
Differential Expression of Phenylalanine Ammonia-Lyase and Chalcone Synthase during Soybean Nodule Development
E. M. Estabrook and C. Sengupta-Gopalan
Department of Agronomy and Horticulture, Molecular Biology Program, Plant Genetic Engineering Laboratory, New Mexico State University, Box 3GL, Las Cruces, New Mexico 88003
We have used conserved and nonconserved regions of cDNA clones for
phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS) isolated from
a soybean-nodule cDNA library to monitor the expression of members of the
two gene families during the early stages of the soybean-Bradyrhizobium
japonicum symbiosis. Our results demonstrate that subsets of the PAL and
CHS gene families are specifically induced in soybean roots after infection
with B. japonicum. Furthermore, by analyzing a supernodulating mutant line
of soybean that differs from the wild-type parent in the number of
successful infections, we show that the induction of PAL and CHS is related
to postinfection events. Nodulated roots formed by a Nod+ Fix- strain of B.
japonicum, resembling a pathogenic association, display induction of
another distinct set of PAL and CHS genes. Our results suggest that the
symbiosis-specific PAL and CHS genes in soybean are not induced by stress
or pathogen interaction.
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