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ANTAGONISTIC EFFECTS OF BRANCHED CHAIN AMINO ACIDS ON THE GROWTH OF SPIRODELA POLYRHIZA (L.) SCHLEIDEN
Author(s) -
Borstlap A. C.
Publication year - 1970
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1970.tb00643.x
Subject(s) - valine , isoleucine , leucine , amino acid , biochemistry , biology , chemistry , stereochemistry
SUMMARY Strong inhibition of the growth of S. polyrhiza occurs when L‐valine, L‐isoleucine or L‐leucine are added singly to the culture medium in a concentration of about 5 × 10 –5 M or higher. Excellent growth takes place, however, when L‐valine and L‐isoleucine are supplied together, also in combination with L‐leucine. When L‐leucine and L‐isoleucine are added simultaneously, growth was completely inhibited, just as with the combination L‐valine and L‐leucine. The results are explained in terms of end‐product inhibition of a common enzymatic step in the synthesis of these branched chain amino acids.