Assessing the use of native rhizobia to improve nitrogen fixation under abiotic stress

IF 1.3 Q3 AGRONOMY
Jesus Loya, Sen Subramanian, Audrey Kalil, Clair Keene, Debankur Sanyal, Jed Eberly, Christopher Graham
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Abstract

Biological nitrogen fixation by rhizobia bacteria plays a pivotal role in sustainable agriculture by converting atmospheric nitrogen into a form that plants can assimilate, thereby reducing the need for synthetic fertilizers. This process can be dramatically reduced by various abiotic stressors. Native rhizobia strains, which are naturally occurring, may be better adapted to the local soil and climatic conditions, making them more resilient to stress factors such as drought, salinity, temperature extremes, and pH variations compared to commercial strains that may have been developed in and for different environments. This study aimed to compare the efficacy of native rhizobia species with a commercial inoculant and uninoculated controls in maintaining nitrogen fixation under induced stress by delayed planting in field peas over two growing seasons (2021 and 2022) in central South Dakota. Our findings indicate that native rhizobia, while not outperforming the commercial inoculant, demonstrated competitive nitrogen fixation capacities. Overall, total nitrogen fixation was not statistically different between a commercial inoculant and native rhizobia formulations. Planting date emerged as a significant factor influencing nitrogen fixation, with later planting substantially reducing overall effectiveness. These results highlight the potential of native rhizobia as an alternative to commercial inoculants and underscore the need for increased screening throughput and improved methods to assess rhizobia efficacy and nodule competition in field settings.

Abstract Image

评估利用本地根瘤菌改善非生物胁迫下的固氮作用
根瘤菌的生物固氮作用可将大气中的氮转化为植物可以吸收的形式,从而减少对合成肥料的需求,在可持续农业中发挥着举足轻重的作用。这一过程会因各种非生物胁迫因素而大幅减少。天然存在的本地根瘤菌菌株可能更适应当地的土壤和气候条件,与在不同环境中开发的商业菌株相比,它们对干旱、盐度、极端温度和 pH 值变化等胁迫因素的适应能力更强。本研究旨在比较本地根瘤菌与商业接种剂和未接种对照在南达科他州中部大田豌豆延迟种植两个生长季(2021 年和 2022 年)的诱导胁迫下维持固氮作用的效果。我们的研究结果表明,本地根瘤菌的固氮能力虽然没有超过商业接种剂,但表现出了竞争性固氮能力。总体而言,商业接种剂和本地根瘤菌配方之间的总固氮量没有统计学差异。种植日期是影响固氮的一个重要因素,较晚的种植日期会大大降低固氮的总体效果。这些结果凸显了本地根瘤菌作为商业接种剂替代品的潜力,并强调需要提高筛选能力和改进方法,以评估根瘤菌在田间环境中的功效和结核竞争。
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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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