Summary
Mated cultures of Blakeslea trispora, which produce trisporic acid, inhibited root and shoot extension of barley plants grown in gnotobiotic cultures, where the carbon from roots was the sole source of carbon available to the microorganism. Unmated cultures of B. trispora and Mucor hiemalis, which do not synthesize trisporic acid, inhibited root extension only. Azotobacter chroococcum had a variable effect in different experiments on both root and shoot extension but could at least partially relieve the inhibitory effect of B. trispora on root growth. Plant growth regulators, applied to roots exogenously, produced effects on plants which, although comparable with some of the inhibitory effects of the micro-organisms, were not comparable with the stimulatory effects of A. chroococcum. re]19751127
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Lynch, J.M., White, N. Effects of some non-pathogenic micro-organisms on the growth of gnotobiotic barley plants. Plant Soil 47, 161–170 (1977). https://doi.org/10.1007/BF00010377
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DOI: https://doi.org/10.1007/BF00010377