Nagib M.A. Nassar and M.V. Sousa
Published May 11, 2007
Genet. Mol. Res. 6 (2): 292-297 (2007)

About the Authors
Nagib M.A. Nassar and M.V. Sousa

Corresponding author
Nagib M.A. Nassar
E-mail: nagnassa@rudah.com.br

ABSTRACT

Cassava roots have a low-protein content (0.7-2%). Amino acids such as lysine and methionine are also low, and some research reports have indicated the absence of methionine. The amino acid profiles of a common cassava cultivar and an interspecific hybrid, namely ICB 300, were determined using the computerized amino acid analyzer Hitachi L-8500. The interspecific hybrid has 10 times more lysine and 3 times more methionine than the common cassava cultivar: lysine content was 0.010 g per 100 g in the common cassava cultivar while it reached 0.098 in the interspecific hybrid. Methionine in the common cassava cultivar was 0.014 g per 100 g whereas it reached 0.041 g per 100 g in the interspecific hybrid. Total amino acid content in the common cassava cultivar was 0.254 g per 100 g viz. a viz. 1.664 g per 100 g in the interspecific hybrid. The genetic variability of the profile and quantity of amino acids indicate the feasibility of selecting interspecific hybrids that are rich in both crude protein and amino acids. This is the first report of high true protein in cassava root.

Key words: Amino acids, Cassava, Lysine, Methionine, Protein content, Interspecific hybrids.