Biostimulants and their role in improving plant growth under drought and salinity

Rakkammal, Kasinathan; Maharajan, Theivanayagam; Ceasar, S. Antony; Ramesh, Manikandan

doi:10.1007/s42976-022-00299-6

Cited by 34 publications

(20 citation statements)

References 134 publications

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“…At the same time, the soil transmits information to plants when water and nutrients are at critical values, prompting plants to reduce their total nutrient uptake by changing their own traits or improving nutrient availability; this process generates a win–win effect through mutual feedback and regulation ( Koster et al., 2019 ; Gong et al., 2020 ). Under saline–alkaline stress conditions, organic acids from different sources in the soil can be directly absorbed by roots and chelate salt ions in plants to convert them into binding states with relatively low activity, thus reducing the damage of salt ions to cells and strengthening the benign interaction between roots and soil ( Jindo et al., 2020 ; Rakkammal et al., 2023 ). By complexing with the salts in the soil, organic acids reduce the direct contact and uptake of salts with plant roots, thus promoting root development, increasing the number of roots, and releasing a large amount of secretion to the soil in the root zone for positive feedback ( Zanin et al., 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Biomass composite with exogenous organic acid addition supports the growth of sweet sorghum (Sorghum bicolor ‘Dochna’) by reducing salinity and increasing nutrient levels in coastal saline–alkaline soil

et al. 2023

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IntroductionIn coastal saline lands, organic matter is scarce and saline stress is high. Exploring the promotion effect of intervention with organic acid from biological materials on soil improvement and thus forage output and determining the related mechanism are beneficial to the potential cultivation and resourceful, high-value utilization of coastal mudflats as back-up arable land.MethodThree exogenous organic acids [humic acid (H), fulvic acid (F), and citric acid (C)] were combined with four kinds of biomass materials [cottonseed hull (CH), cow manure (CM), grass charcoal (GC), and pine needle (PN)] and applied to about 0.3% of medium-salt mudflat soil. The salinity and nutrient dynamics of the soil and the growth and physiological differences of sweet sorghum at the seedling, elongation, and heading stages were observed under different treatments to screen for efficient combinations and analyze the intrinsic causes and influencing mechanisms.ResultsThe soil salinity, nutrient dynamics, and forage grass biological yield during sweet sorghum cultivation in saline soils differed significantly (p < 0.05) depending on the type of organic acid–biomass composite applied. Citric acid–pine needle composite substantially reduced the soil salinity and increased the soil nutrient content at the seedling stage and improved the root vigor and photosynthesis of sweet sorghum by increasing its stress tolerance, allowing plant morphological restructuring for a high biological yield. The improvement effect of fulvic acid–pine needle or fulvic acid–cow manure composite was manifested at the elongation and heading stages.DiscussionCitric acid–pine needle composite promoted the growth of saline sweet sorghum seedlings, and the effect of fulvic acid–pine needle composite lasted until the middle and late stages.

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Section: Discussionmentioning

confidence: 99%

Biomass composite with exogenous organic acid addition supports the growth of sweet sorghum (Sorghum bicolor ‘Dochna’) by reducing salinity and increasing nutrient levels in coastal saline–alkaline soil

et al. 2023

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“…Employing BSts like seaweed extracts, plant growth-promoting rhizobacteria, and humic acids augments the transcript of plant defense-related genes in crops (Agarwal et al, 2016;Pereira et al, 2021). BSts accelerate the antioxidative machinery to scavenge ROS overproduction to cope with adverse climatic conditions (Hasanuzzaman et al, 2021;Rakkammal et al, 2022).…”

Section: Plant Responses To Abiotic Stress Conditionsmentioning

confidence: 99%

“…PHs induce an array of defense responses under adverse plant growth conditions and pose growth and yield-promoting capability under non-stressed conditions. They improve leaf gas exchange through pigment synthesis and protection and improve water use efficiency (Colla et al, 2017;Rakkammal et al, 2022). In addition, PHs also exhibit hormone-like functions that modulate carbon and nitrogen metabolism and improve anti-oxidative properties under stress.…”

Section: Protein Hydrolysate and N-containing Compoundsmentioning

confidence: 99%

Role of biostimulants in mitigating the effects of climate change on crop performance

et al. 2022

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Climate change is a critical yield–limiting factor that has threatened the entire global crop production system in the present scenario. The use of biostimulants in agriculture has shown tremendous potential in combating climate change–induced stresses such as drought, salinity, temperature stress, etc. Biostimulants are organic compounds, microbes, or amalgamation of both that could regulate plant growth behavior through molecular alteration and physiological, biochemical, and anatomical modulations. Their nature is diverse due to the varying composition of bioactive compounds, and they function through various modes of action. To generate a successful biostimulatory action on crops under different parameters, a multi–omics approach would be beneficial to identify or predict its outcome comprehensively. The ‘omics’ approach has greatly helped us to understand the mode of action of biostimulants on plants at cellular levels. Biostimulants acting as a messenger in signal transduction resembling phytohormones and other chemical compounds and their cross–talk in various abiotic stresses help us design future crop management under changing climate, thus, sustaining food security with finite natural resources. This review article elucidates the strategic potential and prospects of biostimulants in mitigating the adverse impacts of harsh environmental conditions on plants.

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“…The harmful effect of Fusarium wilt can be minimized by the induction of natural exogenous inducers such as phytohormones and antioxidant molecules [20][21][22]. Furthermore, the molecules extracted from endophytes have been reported to be powerful biostimulants of growth, physiological immunity, and yield, as they enhanced tolerance to environmental stress by stimulating the antioxidant system and improving nutrient availability and nutrient uptake from the soil [23][24][25][26]. Application of endophytic Aspergillus resulted in a significant rise in the content of chlorophyll, protein contents, total sugar, and phenolic component of infected plants [18].…”

Section: Introductionmentioning

confidence: 99%

Endophytic fungi Aspergillus spp. reduce fusarial wilt disease severity, enhance growth, metabolism and stimulate the plant defense system in pepper plants

Attia

Salem

Abdelaziz

2022

Biomass Conv. Bioref.

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Plants in various republics of the world face many dangers, including diseases that threaten crop productivity. The development and increase of novel species of infectious pathogens have made plant growth threatened. Fusarium wilt is one of the fiercest diseases affecting vegetables, which causes a great loss in the quality and quantity of pepper plants all over the world. In this study, stimulation of physiological immune responses in pepper plant using ecofriendly inducers (Aspergillus alabamensis, Aspergillus oryzae, and Aspergillus tubingensis) against Fusarium wilt had been studied. Endophytic fungi were assayed for their capability to synthesize hydrocyanic acid, phosphate solubilization, siderophores, and indole acetic acid synthesis, and the antifungal potential of ecofriendly inducers against F. oxysporum was also examined. A notable antifungal potential antifusarial with a supreme activity of A. tubingensis was found. More ultrastructure by TEM of Fusarium showed that sharp changes occurred in the cell wall, mycelium, and conidia as a result of treatment with A. tubingensis, A. oryzae, and A. alabamensis. The results demonstrated the high severity of F. oxysporum on pepper seedlings. Infected seedlings showed a high reduction in all vegetative parameters, photosynthesis, entire protein, and total carbohydrate. In the current study, the potential of endophytic fungi through foliar and soil application was applied to the Fusarium-infected pepper plants under pot conditions. Disease index, vegetative growth, photosynthetic pigments, osmolyte content, stress markers, and antioxidant isozymes were assessed. The achieved result indicates that tested endophytes through two modes (foliar and soil) lowered PDI and produced high protection, with the most protection influence represented by A. tubingensis (through the soil) by 83.33%. It was concluded that use of A. tubingensis, A. alabamensis, and A. oryzae could be commercially used as eco-friendly agents for the defense of pepper seedlings against Fusarium wilt disease.

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Biostimulants and their role in improving plant growth under drought and salinity

Cited by 34 publications

References 134 publications

Biomass composite with exogenous organic acid addition supports the growth of sweet sorghum (Sorghum bicolor ‘Dochna’) by reducing salinity and increasing nutrient levels in coastal saline–alkaline soil

Biomass composite with exogenous organic acid addition supports the growth of sweet sorghum (Sorghum bicolor ‘Dochna’) by reducing salinity and increasing nutrient levels in coastal saline–alkaline soil

Role of biostimulants in mitigating the effects of climate change on crop performance

Endophytic fungi Aspergillus spp. reduce fusarial wilt disease severity, enhance growth, metabolism and stimulate the plant defense system in pepper plants

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