首页> 外文期刊>Annals of Agricultural Research >Microbial dynamics in rhizosphere at different growth stages of rice (Oryza sativa L.) based on plant growth promoting functions
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Microbial dynamics in rhizosphere at different growth stages of rice (Oryza sativa L.) based on plant growth promoting functions

机译:基于植物生长促进功能的水稻(Oryza sativa L.)不同生长期的根际微生物动态

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摘要

In the present study 101 bacterial isolates were obtained from rhizosphere of rice plants (Oryza sativa L.) cv PR-118 and PRH-10 cultivated in a field at ICAR-Indian Institute of Seed Science, Mau Nath Bhanjan, Uttar Pradesh, India at different stagesof growth {seedling stage [37 days old after transplantation (RI stage)], booting stage [80 days old after transplantation (RII stage)], Maturating stage [100 days old after transplantation (RIII stage)]. The bacterial isolates were tested for various nutrient mobilizing properties as well as plant growth promotion activities including siderphore production, ammonia production and P solublization in in-vitro conditions. Seventy nine bacterial isolates were found to be siderophore producers, 78 were ammonia producers and 39 were P-solublizers with varying potentials in different activities. It was observed that siderophore producers declined in number as the plant ages but simultaneously the efficiency of siderophore production among them increased with the age of plant. The number of ammonia producers increased from seedling stage to booting stage and declined at maturity stage and the same trend at different growth stages of plant was observed in the ammonia production capability of the isolates. Similar trend was observed for the number of P solublizers and their P solublization capability which in both the cases was found to be maximum at booting stage. The present study reveals that the rhizospheric microbial population and functions changes with the physiological requirement of plants during its developmental growth stages as well as nutritional status of soil.
机译:在本研究中,从在印度北方邦的ICAR-印度种子科学研究所的田间种植的水稻植物(Oryza sativa L.)cv PR-118和PRH-10的根际中获得了101种细菌分离株。生长的不同阶段(育苗阶段[移植后37天(RI阶段)],启动阶段[移植后80天(RII阶段)],成熟期[移植100天(RIII阶段)]。测试了细菌分离物的各种营养素动员特性以及促进植物生长的活性,包括体外条件下的铁载体生产,氨生产和P增溶。发现有79种细菌分离物是铁载体生产者,有78种是氨生产者,有39种是P-增溶剂,它们在不同活动中具有不同的潜力。观察到,随着植物的衰老,铁载体的生产者数量下降,但是同时,其中的铁载体生产效率随着植物的年龄而增加。从幼苗期到孕穗期,氨气生产者的数量增加,而在成熟期则有所下降,并且分离株的氨气生产能力在植物的不同生长阶段均表现出相同的趋势。对于P增溶剂的数量和它们的P增溶能力,观察到相似的趋势,这两种情况在启动阶段都被发现是最大的。本研究表明,根际微生物的种群和功能随着植物在其生长发育阶段的生理需求以及土壤的营养状况而变化。

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