Influence of light on endogenous phytohormone concentrations of a nitrogen-fixing Anabaena sp. cyanobacterium culture in open raceways for use as fertilizer for horticultural crops

Wenz, Joshua; Davis, Jessica G.; Storteboom, Heather

doi:10.1007/s10811-019-01856-z

Cited by 19 publications

(8 citation statements)

References 82 publications

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“…Different light qualities and high light intensities have been shown to promote polysaccharide production in cyanobacteria, for example in Nostoc flagelliforme red light maximized the effects [ 171 ]. In natural light conditions, it is possible to significantly influence abscisic acid, auxin, and salicylic acid contents in cyanobacterial biomass by manipulating culture inoculation density and consequently light availability to the single cell [ 172 ].…”

Section: Cyanobacteria In the Biostimulant Market: Current Status And Main Criticalitiesmentioning

confidence: 99%

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Santini

Biondi

Rodolfi

et al. 2021

Plants

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Cyanobacteria can be considered a promising source for the development of new biostimulants as they are known to produce a variety of biologically active molecules that can positively affect plant growth, nutrient use efficiency, qualitative traits of the final product, and increase plant tolerance to abiotic stresses. Moreover, the cultivation of cyanobacteria in controlled and confined systems, along with their metabolic plasticity, provides the possibility to improve and standardize composition and effects on plants of derived biostimulant extracts or hydrolysates, which is one of the most critical aspects in the production of commercial biostimulants. Faced with these opportunities, research on biostimulant properties of cyanobacteria has undergone a significant growth in recent years. However, research in this field is still scarce, especially as regards the number of investigated cyanobacterial species. Future research should focus on reducing the costs of cyanobacterial biomass production and plant treatment and on identifying the molecules that mediate the biostimulant effects in order to optimize their content and stability in the final product. Furthermore, the extension of agronomic trials to a wider number of plant species, different application doses, and environmental conditions would allow the development of tailored microbial biostimulants, thus facilitating the diffusion of these products among farmers.

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Section: Cyanobacteria In the Biostimulant Market: Current Status And Main Criticalitiesmentioning

confidence: 99%

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Santini

Biondi

Rodolfi

et al. 2021

Plants

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“…For instance, hormones can modulate oxidative stress responses by interacting with ROS mediated by respiratory burst oxidase homologs (RBOHs), leading to distinct transcriptomic and physiological cascades. Several studies have demonstrated that salinity increases ROS production RBOH activity, which in turn inhibits hormone synthesis, resulting in decreased hormone concentrations [ 72 , 73 ] (Fig. 9 ).…”

Section: Discussionmentioning

confidence: 99%

Enhancing saline stress tolerance in soybean seedlings through optimal NH4+/NO3− ratios: a coordinated regulation of ions, hormones, and antioxidant potential

Noor,

Ahmad,

Ullah

et al. 2024

BMC Plant Biol

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Background Nitrogen (N) availability is crucial in regulating plants’ abiotic stress resistance, particularly at the seedling stage. Nevertheless, plant responses to N under salinity conditions may vary depending on the soil’s NH4+ to NO3− ratio. Methods In this study, we investigated the effects of different NH4+:NO3− ratios (100/0, 0/100, 25/75, 50/50, and 75/25) on the growth and physio-biochemical responses of soybean seedlings grown under controlled and saline stress conditions (0-, 50-, and 100-mM L− 1 NaCl and Na2SO4, at a 1:1 molar ratio). Results We observed that shoot length, root length, and leaf-stem-root dry weight decreased significantly with increased saline stress levels compared to control. Moreover, there was a significant accumulation of Na+, Cl−, hydrogen peroxide (H2O2), and malondialdehyde (MDA) but impaired ascorbate-glutathione pools (AsA-GSH). They also displayed lower photosynthetic pigments (chlorophyll-a and chlorophyll-b), K+ ion, K+/Na+ ratio, and weakened O2•−-H2O2-scavenging enzymes such as superoxide dismutase, catalase, peroxidase, monodehydroascorbate reductase, glutathione reductase under both saline stress levels, while reduced ascorbate peroxidase, and dehydroascorbate reductase under 100-mM stress, demonstrating their sensitivity to a saline environment. Moreover, the concentrations of proline, glycine betaine, total phenolic, flavonoids, and abscisic acid increased under both stresses compared to the control. They also exhibited lower indole acetic acid, gibberellic acid, cytokinins, and zeatine riboside, which may account for their reduced biomass. However, NH4+:NO3− ratios caused a differential response to alleviate saline stress toxicity. Soybean seedlings supplemented with optimal ratios of NH4+:NO3− (T3 = 25:75 and T = 4 50:50) displayed lower Na+ and Cl− and ABA but improved K+ and K+/Na+, pigments, growth hormones, and biomass compared to higher NH4+:NO3− ratios. They also exhibited higher O2•−-H2O2-scavenging enzymes and optimized H2O2, MDA, and AsA-GSH pools status in favor of the higher biomass of seedlings. Conclusions In summary, the NH4+ and NO3− ratios followed the order of 50:50 > 25:75 > 0:100 > 75:25 > 100:0 for regulating the morpho-physio-biochemical responses in seedlings under SS conditions. Accordingly, we suggest that applying optimal ratios of NH4+ and NO3− (25/75 and 50:50) can improve the resistance of soybean seedlings grown in saline conditions.

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“…It is difficult to separate the influence of nutrients in cyanobacterial fertilizer from the impact of its accompanying phytohormones on plant growth or physiology. Wenz et al [42] evaluated whether management of the cyanobacterial production process influenced phytohormone concentrations; they reported that culture inoculation density was a significant variable in predicting the concentrations of indole-3-acetic acid, indole acetamide, and salicylic acid concentrations. As we learn more, it may become possible to manage the cyanobacterial fertilizer production process to optimize phytohormone levels for different crops.…”

Section: Potential Benefits Of Cyanobacterial Fertilizermentioning

confidence: 99%

Beyond Soil Inoculation: Cyanobacteria as a Fertilizer Replacement

Massey

Davis

2023

Nitrogen

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Nitrogen-fixing bacteria such as cyanobacteria have the capability to fix atmospheric nitrogen at ambient temperature and pressure, and intensive cultivation of cyanobacteria for fertilizer could lead to its use as an “environmentally friendly” replacement or supplement for nitrogen (N) fertilizer derived from the Haber–Bosch process. Prior research has focused on the use of N-fixing bacteria as a soil inoculum, and while this can improve crop yields, yield improvements are generally attributed to plant-growth-promoting substances produced by the bacteria, rather than to biological N fixation. The intensive cultivation of cyanobacteria in raceways or bioreactors can result in a fertilizer that provides N and organic carbon, as well as potentially similar growth-promoting substances observed in prior research work. On-farm or local production of cyanobacterial fertilizer could also circumvent infrastructure limitations, economic and geopolitical issues, and challenges in distribution and transport related to Haber–Bosch-derived N fertilizers. The use of cyanobacterial N fertilizer could have many agronomic and environmental advantages over N fertilizer derived from the Haber–Bosch process, but study of cyanobacteria as a replacement for other N fertilizers remains very limited. Scientific and practical challenges remain for this promising but as-yet unproven approach to maintaining or improving soil N fertility.

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Influence of light on endogenous phytohormone concentrations of a nitrogen-fixing Anabaena sp. cyanobacterium culture in open raceways for use as fertilizer for horticultural crops

Cited by 19 publications

References 82 publications

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Enhancing saline stress tolerance in soybean seedlings through optimal NH4+/NO3− ratios: a coordinated regulation of ions, hormones, and antioxidant potential

Beyond Soil Inoculation: Cyanobacteria as a Fertilizer Replacement

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