Biosynthesis of gibberellin plant hormons by pathogenic bacteria

病原菌生物合成赤霉素植物激素

• 批准号: 278223674
• 负责人: Dr. Raimund Nagel
• 金额: --
• 依托单位: Arbeitsgruppe Pflanzenphysiologie
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278223674?language=en
• 关键词: Biosynthesis; gibberellin; plant; hormons; pathogenic

Gibberellins are plant hormones that coordinate their precisely timed development. They are important for regulation of e.g. stem elongation, germination, dormancy, flowering, leaf senescence and fruit development. More recently it was also revealed that gibberellins can alter the induction of plant defense against herbivores and pathogens. For those reasons biosynthesis and the mode of action are well studied in plants and the plant pathogenic fungi Gibberella fujikuroi causing the bakanae disease, where infected rice plants grow too rapidly and often fall over. However besides pathogenic fungi, also pathogenic bacteria seem to be able to produce gibberellins. The presence of a gibberellin biosynthetic operon was recently confirmed in the rice pathogen Xanthomonas oryzae pv. oryzicola and the wheat/barley pathogens Xanthomonas translucens pv. translucens and pv. graminis. An analysis of the genes present in the biosynthetic operon shows that different genes are involved in the later steps of gibberellin biosynthesis in bacteria compared to plants or fungi, indicating that gibberellin biosynthesis may evolved separately three times. The proposed project aims to elucidate the underlying biochemical pathway for gibberellin biosynthesis in these Xanthomonas spp. in detail, as well as to characterize the relevance of gibberellins for plant-pathogen interaction.

赤霉素是协调其精确定时发育的植物激素。它们对于监管等非常重要。茎伸长、发芽、休眠、开花、叶片衰老和果实发育。最近还发现赤霉素可以改变植物对食草动物和病原体的防御的诱导。由于这些原因，人们对植物和引起恶苗病的植物病原真菌藤黑赤霉的生物合成和作用方式进行了深入研究，受感染的水稻植株生长过快，常常倒伏。然而，除了致病真菌之外，致病细菌似乎也能够产生赤霉素。最近在水稻病原体 Xanthomonas oryzae pv. 中证实了赤霉素生物合成操纵子的存在。 oryzicola 和小麦/大麦病原体 Xanthomonas translucens pv.半透明和PV。禾本科植物。对生物合成操纵子中存在的基因的分析表明，与植物或真菌相比，细菌中赤霉素生物合成的后期步骤涉及不同的基因，这表明赤霉素生物合成可能分别进化了三次。该项目旨在阐明这些黄单胞菌属中赤霉素生物合成的潜在生化途径。详细地描述了赤霉素与植物-病原体相互作用的相关性。