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 (ôk′sə-trŏf′ĭk, -trō′fĭk)
Requiring one or more specific substances for growth and metabolism that the parental organism was able to synthesize on its own. Used with respect to organisms, such as strains of bacteria, algae, or fungi, that can no longer synthesize certain growth factors because of mutational changes.

[Greek auxein, to increase; see auxin + -trophic.]

aux·ot′ro·phy (ôk-sŏt′rə-fē) n.
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References in periodicals archive ?
100], a biotin requiring auxotrophic mutant, derived from a regulatory mutant Micrococcus glutamicus [AB.
0] strains allowed to identify some differential phenotypes, for example, amino acid requirements are not exactly the same for these genetically defined strains and the auxotrophic phenotype of the [(p)ppGpp.
Karenia brevis is a Auxotrophic, marine dinoflagellate found in the Gulf of Mexico that generates periodic, if not annual, harmful algal blooms (also known as 'red tides') in certain coastal areas.
K, Enterobacterial MRHA plasmid and its possible Genetic Transformation With Escherichia coli K-12 at auxotrophic Phenotypes.
Scientists from Europe, North America, and the Antipodes explore how plants control primary auxotrophic pathways and pathways in common with the primary pathways in mammalian cells.
1998) with 2% galactose and supplemented with the required auxotrophic requirements.
beta]-D-Glucuronidase activity among prototrophic and auxotrophic variants of Escherichia coli and other Enterobacteriaceae commonly implicated in urinary tract infections.
The resulting plasmid was transformed into CRS5-/-(metallothionein deficient) yeast using auxotrophic selection.
In order to obtain revertants of the os-9 and os-11 loci, both strains were crossed to the auxotrophic mutant trp-l, and double mutants from each cross were recovered.