Phytohormones Mediated Modulation of Abiotic Stress Tolerance and Potential Crosstalk in Horticultural Crops

Altaf, Muhammad Ahsan; Shahid, Rabia; Kumar, Ravinder; Altaf, Muhammad Mohsin; Kumar, Awadhesh; Khan, Latif Ullah; Saqib, Muhammad; Nawaz, Muhammad Azher; Saddiq, Bushra; Bahadur, Saraj; Tiwari, Rahul Kumar; Lal, Milan Kumar; Naz, Safina

doi:10.1007/s00344-022-10812-0

Cited by 42 publications

(8 citation statements)

References 281 publications

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“…Phytohormones are small biomolecules responsible for controlling cell expansion and division and regulating diverse mechanisms, mainly involved in immune reactions and responses to biotic stress ( Davies, 2010 ; Vos et al., 2013 ; Altaf et al., 2023 ). The effect of each plant hormone depends on the plant species, target organ, rate of transport to the target tissue, and phytohormone concentration ( Small and Degenhardt, 2018 ).…”

Section: Plant Growth In a Changing Environmentmentioning

confidence: 99%

“…Auxins stimulate cell division in the cambium ( Davies, 2010 ; Rademacher, 2015 ; Gallei et al., 2020 ) and can control cell elongation by increasing osmolyte concentration and water permeability in cells while decreasing wall pressure ( Keswani et al., 2020 ). Auxins are responsible for the apical dominance, the delay of leaf abscission, the development of flower organs and fruits, the emission of lateral roots and adventitious roots ( Keswani et al., 2020 ; Altaf et al., 2023 ), although they are known to exert an inhibitory effect on primary root growth ( Qin and Huang, 2018 ). Cytokinins regulate the synthesis of proteins involved in mitosis ( Small and Degenhardt, 2018 ) and thus stimulate cell division in meristematic tissues ( Rademacher, 2015 ).…”

Section: Plant Growth In a Changing Environmentmentioning

confidence: 99%

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A plant’s perception of growth-promoting bacteria and their metabolites

Abou Jaoudé,

Luziatelli,

Ficca

et al. 2024

Front. Plant Sci.

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Many recent studies have highlighted the importance of plant growth-promoting (rhizo)bacteria (PGPR) in supporting plant’s development, particularly under biotic and abiotic stress. Most focus on the plant growth-promoting traits of selected strains and the latter’s effect on plant biomass, root architecture, leaf area, and specific metabolite accumulation. Regarding energy balance, plant growth is the outcome of an input (photosynthesis) and several outputs (i.e., respiration, exudation, shedding, and herbivory), frequently neglected in classical studies on PGPR-plant interaction. Here, we discuss the primary evidence underlying the modifications triggered by PGPR and their metabolites on the plant ecophysiology. We propose to detect PGPR-induced variations in the photosynthetic activity using leaf gas exchange and recommend setting up the correct timing for monitoring plant responses according to the specific objectives of the experiment. This research identifies the challenges and tries to provide future directions to scientists working on PGPR-plant interactions to exploit the potential of microorganisms’ application in improving plant value.

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Section: Plant Growth In a Changing Environmentmentioning

confidence: 99%

Section: Plant Growth In a Changing Environmentmentioning

confidence: 99%

A plant’s perception of growth-promoting bacteria and their metabolites

Abou Jaoudé,

Luziatelli,

Ficca

et al. 2024

Front. Plant Sci.

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“…Phytohormones are important biomolecules that regulate normal physiological activities and ensure better growth and development of plants [135]. These biomolecules provide tolerance against several abiotic stresses via complex signaling cascades, from receiving a signal to activation of several stress-specific genes [136]. Phytohormones provide a better microenvironment for plant growth and development by establishing proper source and sink relationships and resource partitioning to different organs based on their need to acclimatize under adverse environmental conditions [137].…”

Section: Crosstalk Between Glycine Betaine and Phytohormonesmentioning

confidence: 99%

Glycine Betaine

Singh

Choudhary

2022

J. Pharm. Nutr. Sci.

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Abiotic stresses like temperature, water, salinity, ultraviolet (UV) radiations, heavy metals, etc., affect plants’ growth and yield. Despite these constraints, plants produce a variety of metabolites to maintain their survival. Primary metabolites, produced through crucial metabolic processes, are essential for plants survival. Additionally, secondary metabolites (SMs) are synthesized from primary metabolites and are mainly used as a defensive mechanism and a means of interacting with unfavorable environmental conditions. In addition to their defensive function in plants, SMs are significant in the pharmaceutical industry. Glycine betaine (GB) is a quaternary ammonium compound that belongs to a class of SMs, present in plants, animals, and microbes. It functions as a compatible solute and reflects potential bioactivity against various abiotic stresses like salinity, water, heat, heavy metals, UV radiations, etc. Due to high solubility and low viscosity, its accumulation is commonly observed in chloroplasts and plastids. The accumulation level generally depends on plant species, growth stage, exposure duration, and stress's nature. GB reduces oxidative stress and prevents the damaging of photosystems and other biomolecules under stressful conditions. It is important for maintaining the water potential and osmotic pressure of cells and hence functions as a potent osmolyte under salinity stress. Excessive production of ROS during temperature stress is responsible for damage to oxygen-evolving complexes, electron transport chains, and photosystems. In order to protect plants from these damages, GB activates the genes responsible for synthesizing heat shock proteins, glycoproteins, and antioxidants via various signaling pathways. GB alleviates the effect of water stress by maintaining the function of rubisco and calcium ion ATPase activity via crosstalk with Abscisic acid (ABA) and ethylene. GB supports the proper functioning of the ascorbate-glutathione cycle, superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase (antioxidative enzymes) to overcome various stresses. Phytohormones like salicylic acid (SA), jasmonic acid (JA), ABA, ethylene, and polyamines (PAS) coordinate well with GB via different signaling pathways to ensure plant protection under various abiotic stresses. The potential bioactivity of GB against various abiotic stresses in plants has been summarized in this review.

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“…Phytohormones are considered plant-protecting hormones under abiotic stress conditions. Different phytohormones are well-known management strategies, which act as stress-relieving bioactive compounds in vegetable crops (Fahad et al, 2015;Altaf et al, 2022a). The exogenous spray of numerous phytohormones can reduce the drought and salinity stresses and also improve the plant defense mechanism focusing on sustainable production.…”

Section: Introductionmentioning

confidence: 99%

Phytohormones unlocking their potential role in tolerance of vegetable crops under drought and salinity stresses

Pang¹

2023

Front. Plant Sci.

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Globally, abiotic stresses are drastically reducing the productivity of vegetable crops. Among abiotic stresses, drought and salinity are more challenging constraints for the sustainable production of vegetables. A great variety of vegetables are facing dry and hot summer spells, poor water availability, and higher salinity mainly due to irrigation with brackish water. Vegetables are considered higher water-dependent crops, requiring water for proper growth and yield. Drought and salinity impair plant metabolism. The disruption in plant metabolism leads to a reduction in growth, developmental processes, and ultimately crop yield. Appropriate management measures are needed to cope with the adverse effects of drought and salinity. Different agronomic and molecular approaches contributed to improving tolerance. Therefore, the present review significantly explores the impact of phytohormones on vegetable crops under drought and salinity stresses. Phytohormones (salicylic acid, melatonin, jasmonates, Brassinosteroids, ascorbic acid, and numerous others) can be sprayed for improvement of plant growth, yield, and photosynthetic pigments by modulation of physiological and biochemical processes. In this manner, these phytohormones should be explored for sustainable production of vegetable crops growing under abiotic stress conditions.

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Phytohormones Mediated Modulation of Abiotic Stress Tolerance and Potential Crosstalk in Horticultural Crops

Cited by 42 publications

References 281 publications

A plant’s perception of growth-promoting bacteria and their metabolites

A plant’s perception of growth-promoting bacteria and their metabolites

Glycine Betaine

Phytohormones unlocking their potential role in tolerance of vegetable crops under drought and salinity stresses

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