Stress-induced changes in the free amino acid composition in transgenic soybean plants having increased proline content
2006
Simon-Sarkadi, L. | Kocsy, G. | Varhegyi, A. | Galiba, G. | De Ronde, J.A.
Following drought stress at supraoptimal temperature the increase in proline (Pro) concentration in transgenic (T) soybean (Glycine max cv. Ibis) plants overexpressing the gene coding for the last enzyme of Pro biosynthesis, L-delta1-pyrroline-5-carboxylate reductase, was much greater than in wild type (W) plants (105-fold versus 19-fold after 7 d). Under control conditions, arginine accounted for nearly 60% of the total free amino acid (TAA) content. After stress treatment, the proportion of Pro in TAA was more than 50% in both T and W genotypes, and at the end of recovery, the proportion of gamma-aminobutyrate in TAA reached 27 and 53% in W and T plants, respectively. Without stress treatment there was only a 2-fold difference between T and W in the tyrosine concentration. However, during the stress period and the subsequent recovery, a similar difference was found for many amino acids. Manipulating the concentration of a single amino acid influences the whole free amino acid composition of soybean.
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