Ethylene crosstalk with isoprenoid-derived signaling molecules in the context of salinity tolerance

Khan, Sheen; Sehar, Zebus; Nidhi, Nidhi; Albaqami, Mohammed; Khan, Nafees A.

doi:10.1016/j.envexpbot.2023.105379

Cited by 7 publications

(4 citation statements)

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“…Phytohormones play crucial roles in regulating various signals in ethylene production necessary for growth and development through their cooperative or inhibitory interaction with other hormones [78]. The stability of ACS protein is subject to regulation by a range of hormonal regulators, including cytokinins, brassinosteroids, auxins, jasmonic acid, abscisic acid, salicylic acid, and gibberellic acid [79].…”

Section: Other Mechanisms For Acs Regulationmentioning

confidence: 99%

“…Elevated levels of ABA in Arabidopsis promote the upregulation of ABI4 expression, suppressing ethylene generation by reducing the transcription of ACS4 and ACS8, leading to stomatal closure. This indicates an intricate interplay between the hormones regulating stomatal aperture size [78]. Zhu et al [81] elucidated this mechanism in tomatoes, showing that applying brassinolide (BL) to tomato plants increases ethylene and H 2 O 2 production.…”

Section: Other Mechanisms For Acs Regulationmentioning

confidence: 99%

“…ACO is classified within the 2-oxoglutarate-dependent dioxygenase (2OGD) superfamily, comprising non-heme iron proteins [95]. Few studies suggest that the 2-oxoglutarate-dependent dioxygenase enzyme is located in the cytosol, but others postulated that ACO is localized in the plasma membrane [78]. Based on similarities in their amino acid sequences, the three DOXA, DOXB, and DOXC subclasses of the plant 2OGD superfamily can be distinguished; ACO belongs to the DOXC subclass [95].…”

Section: Acomentioning

confidence: 99%

“…In response to abiotic stress, ACS and ACO enzymes are modulated to regulate ethylene production, acting as mediators of stress adaptation. Both calcium-CDPK and MAPK signaling cascades are simultaneously activated, and their partial convergence contributes to the development of specific responses to each stimulus [78]. Table 2 summarizes how the expression of various ACS and ACO isoforms in plants is altered in response to different abiotic stress.…”

Section: Acs and Aco In Relation To Abiotic Stressmentioning

confidence: 99%

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The Ethylene Biosynthetic Enzymes, 1-Aminocyclopropane-1-Carboxylate (ACC) Synthase (ACS) and ACC Oxidase (ACO): The Less Explored Players in Abiotic Stress Tolerance

Khan,

Alvi,

Saify

et al. 2024

Biomolecules

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Ethylene is an essential plant hormone, critical in various physiological processes. These processes include seed germination, leaf senescence, fruit ripening, and the plant’s response to environmental stressors. Ethylene biosynthesis is tightly regulated by two key enzymes, namely 1-aminocyclopropane-1-carboxylate synthase (ACS) and 1-aminocyclopropane-1-carboxylate oxidase (ACO). Initially, the prevailing hypothesis suggested that ACS is the limiting factor in the ethylene biosynthesis pathway. Nevertheless, accumulating evidence from various studies has demonstrated that ACO, under specific circumstances, acts as the rate-limiting enzyme in ethylene production. Under normal developmental processes, ACS and ACO collaborate to maintain balanced ethylene production, ensuring proper plant growth and physiology. However, under abiotic stress conditions, such as drought, salinity, extreme temperatures, or pathogen attack, the regulation of ethylene biosynthesis becomes critical for plants’ survival. This review highlights the structural characteristics and examines the transcriptional, post-transcriptional, and post-translational regulation of ACS and ACO and their role under abiotic stress conditions. Reviews on the role of ethylene signaling in abiotic stress adaptation are available. However, a review delineating the role of ACS and ACO in abiotic stress acclimation is unavailable. Exploring how particular ACS and ACO isoforms contribute to a specific plant’s response to various abiotic stresses and understanding how they are regulated can guide the development of focused strategies. These strategies aim to enhance a plant’s ability to cope with environmental challenges more effectively.

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Section: Other Mechanisms For Acs Regulationmentioning

confidence: 99%

Section: Other Mechanisms For Acs Regulationmentioning

confidence: 99%