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AMINO ACID NUTRITION IN THE BLUE‐GREEN ALGA NOSTOC MUSCORUM
Author(s) -
VAISHAMPAYAN A.
Publication year - 1982
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1982.tb04487.x
Subject(s) - amino acid , biochemistry , amino acid synthesis , valine , alanine , methionine , glutamine , asparagine , arginine , glycine , isoleucine , proline , biology , chemistry , leucine , lysine
SUMMARY The L‐isomers of 21 amino acids have been screened for their ability to serve as carbon or nitrogen sources for growth of the het + nif − 11 heterocystous and non‐nitrogen fixing mutant strain of the blue‐green alga Nostoc muscorum by a simple test system combining the use of 3‐(3,4‐dichlorophenyl)‐1,1‐dimethylurea (DCMU) (an inhibitor of photosynthetic assimilation of CO 2 ) and the auxotrophic (non‐nitrogen fixing) characteristic of the mutant. The amino acids glutamate, alanine, tyrosine and cysteine were toxic; glutamine, histidine, asparagine, tryptophan and serine were utilized as nitrogen sources; arginine, proline and phenylalanine were utilized as carbon sources; leucine, isoleucine, lysine, methionine, valine and citrulline were utilized as sources of both carbon and nitrogen; aspartate, threonine and glycine served neither as carbon nor nitrogen sources.