The growth and interaction of coinoculated strains of Pseudomonas spp. on sugar beet seed were monitored for 48 h after planting in natural soil maintained at −15 J/kg and 16 C. There was no interaction between and among strains in the spermosphere when they were inoculated together at approximately 10 4 cfu per seed. Strains capable of producing antibiotics and siderophores did not inhibit sensitive strains in the spermosphere. However, antagonism between strains often occurred when seeds were coinoculated with one strain at a high inoculum density (approximately 10 7 cfu per seed) and the other at a low density (approximately 10 4 cfu per seed)
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Ryo Fukui (1994) studied this question.