| 摘要 |
Plant growth regulants including gibberellins are produced by fermentation of the phytopathogenic fungus Sphaceloma manihoticola, known to be the cause of the superelongation disease of cassava. In standard incubations, a wild type strain of S. manihoticola (DSM 1638) produces GA4 in concentrations of up to about 7 mg per liter of culture filtrate. Other gibberellins, namely GA9, GA13, GA14, GA15, GA24, GA25, GA36, and GA37 are biosynthesized in smaller amounts. In contrast to Gibberella fujikuroi, the organism hitherto used to produce gibberellins commercially, no GA1, GA3 and GA7 is synthesized by S. manihoticola. GA4, as its main gibberellin can therefore be isolated in a pure form with simple means from culture filtrates of S. manihoticola. |
