Effect of fungal damage by Fusarium spp and Diaporthe/Phomopsis complex on protein quantity and quality of soybean seed

JOSE MERILES,; LUZ LAMARQUE, ALICIA; ONDINA LABUCKAS, DIANA; DAMIAN MODESTO MAESTRI

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE

Wiley

Año: 2004 vol. 84 p. 1594 - 1598

0022-5142

Seeds from three soybean genotypes were tested to evaluate the effect of fungal damage by Fusarium spp and Diaporthe/Phomopsis complex on protein quantity and quality. Fungus-infected seeds had higher protein contents than uninfected ones. A selective degradation of soluble proteins was detected in seeds infected with either fungus. Some of the storage proteins degraded were identified as a´, a and b subfractions of the b-conglycinin, and A3 subfraction of the glicynin. Furthermore, reductions in lipoxygenase and trypsin inhibitor activities were observed in fungus-infected seeds. Amino acid composition did not vary between infected and uninfected seeds lots, so protein degradation should not affect amino acid structures.