Serotonin: A frontline player in plant growth and stress responses

Abstract

Serotonin is a well‐studied pineal hormone that functions as a neurotransmitter in mammals and is found in varying amounts in diverse plant species. By modulating gene and phytohormonal crosstalk, serotonin has a significant role in plant growth and stress response, including root, shoot, flowering, morphogenesis, and adaptability responses to numerous environmental signals. Despite its prevalence and importance in plant growth and development, its molecular action, regulation and signalling processes remain unknown. Here, we highlight the current knowledge of the role of serotonin‐mediated regulation of plant growth and stress response. We focus on serotonin and its regulatory connections with phytohormonal crosstalk and address their possible functions in coordinating diverse phytohormonal responses during distinct developmental phases, correlating with melatonin. Additionally, we have also discussed the possible role of microRNAs (miRNAs) in the regulation of serotonin biosynthesis. In summary, serotonin may act as a node molecule to coordinate the balance between plant growth and stress response, which may shed light on finding its key regulatory pathways for uncovering its mysterious molecular network.

A transition from enemies to allies: how viruses improve drought resilience in plants

“…Phytohormones plays a crucial role in plant responses to various stresses, including biotic and abiotic stresses. Research show importance of hormonal crosstalk during plant growth, development and stress responses (Yang et al 2019 ; Mishra and Sarkar 2023 ). For example, during stress conditions or various developmental processes, crosstalk between JA, gibberellic acid (GA), cytokinin and auxin occurs (Liu and Timko 2021 ).…”