Assessing the relevance of an enhanced root growth due to the activity of rhizobacteria for plant phosporus uptake under low P supply

评估低磷供应下根际细菌活性增强根系生长与植物磷吸收的相关性

• 批准号: 37149457
• 负责人: Dr. Bernd Steingrobe
• 金额: --
• 依托单位: Abteilung Pflanzenernährung und Ertragsphysiologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/37149457?language=en
• 关键词: Assessing; relevance; enhanced; root; growth

Plant growth promoting rhizobacteria help plants to grow at sub-optimal P supply in different ways. They increase P availability in the rhizosphere and they can induce an enhanced root growth which enables plants to exploit larger soil volumes. The objective is to assess for an Enterobacter strain (E. radicincitans) which of these processes is of more importance. Root growth dynamics of maize will be determined in rhizoboxes which allow a daily view on the roots. Furthermore, root growth will also be quantified in field experiments at different P and inoculation levels. The ability of E. radicincitans to increase P soil solution concentration will be investigated in incubation studies with soils differing in their main P source. Additionally, a P fractionation of rhizosphere soil of incubated and non-incubated plants in comparison to bulk soil reveals which P form is mainly solved by E. radicincitans. Finally, all the data of the field, pot, and incubation experiments will be used for modelling sorption processes, soil transport, and uptake. This gives information about the relevance of enhanced root growth and/or P solubilization for a better plant growth at sub-optimal P supply.

促进植物生长的根瘤菌以不同的方式帮助植物在次优磷供应下生长。它们增加了根际磷的有效性，并能促进根系生长，使植物能够利用更大的土壤体积。目的是评估一种肠杆菌菌株（根瘤菌）这些过程中哪一个更重要。玉米的根系生长动态将在根箱中确定，根箱允许每天观察根系。此外，在不同磷和接种水平的田间试验中，根系生长也将被量化。在不同主要磷源土壤的孵育研究中，将研究根芽孢杆菌增加土壤磷溶液浓度的能力。此外，通过对培养和非培养植物根际土壤磷的分异分析，揭示了根尖芽孢杆菌主要溶解哪一种磷形态。最后，所有田间、盆栽和孵化实验的数据将用于模拟吸收过程、土壤运输和吸收。这提供了在次优磷供应下，促进根系生长和/或磷溶解与植物更好生长的相关性的信息。