赤霉菌中赤霉素生物合成的调控。
Regulation of Gibberellin Biosynthesis in Gibberella fujikuroi.
机构信息
Departamento de Genética, Universidad de Sevilla, Sevilla, Spain.
出版信息
Plant Physiol. 1992 Nov;100(3):1184-8. doi: 10.1104/pp.100.3.1184.
Abstract
Gibberellin production by Gibberella fujikuroi started only after the nitrogen source was depleted and ceased upon its renewal. Nitrogen repression of gibberellin biosynthesis is not an indirect effect of the growth arrest that follows the depletion of an essential nutrient because gibberellins were not produced upon depletion of phosphate. Mycelia produced gibberellins when suspended in a glucose solution. Production ceased some time after depletion of glucose and resumed upon its readdition. Under certain conditions, the gibberellin production rate was inversely proportional to the glucose concentrations. The specific regulation of gibberellin biosynthesis by the nitrogen source imposes a revision of the concept that gibberellins are secondary metabolites whose production is triggered by imbalance or cessation of growth.
摘要
藤仓赤霉开始产生赤霉素只有在氮源耗尽后，并且在其更新时停止。氮对赤霉素生物合成的抑制不是生长停滞的间接影响，因为在磷酸盐耗尽时不会产生赤霉素。当菌丝悬浮在葡萄糖溶液中时会产生赤霉素。在葡萄糖耗尽后，生产停止一段时间，然后在重新添加葡萄糖后恢复。在某些条件下，赤霉素的生产速率与葡萄糖浓度成反比。氮源对赤霉素生物合成的特异性调节，修正了赤霉素是次级代谢物的概念，即赤霉素的产生是由生长失衡或停止触发的。
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