432 



PLANT GROWTH SUBSTANCES 



TABLE 1 

 Summary of compounds recognized as growth factors for various bacteria* 



Amino acids 



Vitamins " 



Purine and pyrimidine 



BASES 



L-alanine 

 D-alanine 

 L-arginine 

 L-aspartic acid 

 L-cysteine 

 L-glutamic acid 



Glycine 



L-histidine 

 L-isoleucine 

 L-leucine 

 L-lysine 



L-phenylalanine 

 L-proIine 



L-serine 



L-threonine 



L-tryptophan 

 L-tyrosine 



/7-Aminobenzoic acid 



Biotin 

 Choline 

 Folic acid 



Nicotinic acid 

 (nicotinamide) 



Pantothenic acid 



Riboflavin 



Thi 



lamm 



L-vali 



ine 



Vitamin Be (pyridoxal 

 pyridoxamine, 

 pyridoxine) 



Vitamin B12 

 Vitamin K 



Conjugated vitamins 



Coenzyme I or II 

 Pyridoxamine phosphate 

 Thiamin pyrophosphate 



Fatty acids 



Acetic acid 

 Oleic acid (or other 

 unsaturated acid) 



Adenine 



Hypoxanthine 



Guanine 



Uracil 



Thymine 



Nucleosides and 

 Nucleotides 



Ribonucleotides 

 (several) 



Desoxyribonucleosides 

 (several, e.g. 

 thymidine) 



Miscellaneous 

 Asparagine 



Glutamine 



Hemin 



Putrescine (spermine 

 or spermidine) 



Unidentified factors 



(See Table 3) 



*Appr()priate fragments or bound forms of these growth factors may nlso satisfy 

 the nutritional requirements of certain bacteria. 



