Research Progress of Plant Signaling in Systemic Responses to Abiotic Stresses

doi:10.11983/CBB23063

Abstract

Abstract: As plants cannot escape from adversity, they need to evolve highly sensitive and flexible physiological mechanisms to cope with various abiotic stresses in the natural environment. It has been shown that when plants are subjected to abiotic stresses in local tissues or organs, the plant is able to generate systemic responses through intercellular signaling that allows the plant to develop an acclimation to the stress (i.e., systemic acquired acclimation). Currently, a large amount of work has investigated the role of intercellular signaling molecules in systemic acquired acclimation of plants (mainly including reactive oxygen species signals, calcium signals, electrical signals, plant hormones, phosphatidylinositol, and pH signals) receptor-like protein kinases and other protein kinases in systemic signaling. Here, we mainly review the research progress of intercellular signaling in the abiotic stress-induced systemic responses in plants, and analyze the possible relationships among different signals, so as to provide reference for related research.

Key words: abiotic stress, systemic acquired acclimation, reactive oxygen species signals, calcium signals, electrical signals, plant hormones

Yuejing Zhang, Hetian Sang, Hanqi Wang, Zhenzhen Shi, Li Li, Xin Wang, Kun Sun, Ji Zhang, Hanqing Feng. Research Progress of Plant Signaling in Systemic Responses to Abiotic Stresses[J]. Chinese Bulletin of Botany, 2024, 59(1): 122-133.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB23063

https://www.chinbullbotany.com/EN/Y2024/V59/I1/122

Figures/Tables 1

Figure 1 Conceptual models of systemic signal transduction (Ca2+ signal, ROS signal, electrical signals and plant hormones) in plants under different abiotic stresses When the local plant is stimulated by various abiotic stresses, the stimulated cells activate GLR, Ca2+ channels and TPC1, which leads to an increase in the concentration of Ca2+ in the cytoplasm, accompanied by changes in electrical signals. Cytoplasmic Ca2+ and CDPK, CPK5 and other proteins work together to activate RBOHD, which leads to an increase in extracellular ROS. Extracellular ROS can further increase cytoplasmic Ca2+ levels by activating Ca2+ channels and cause a phosphorylation cascade reaction of MAPK. CDPK and MAPK may work together to regulate the biosynthesis of plant hormones, which further increases the intensity of Ca2+ signals, ROS signals and electrical signals. At the same time, cells directly stimulated by stresses may induce similar changes in neighboring cells through PD and extracellular ROS-mediated intercellular interactions. This intercellular action extends further, thus the formation of systemic signals in the plant can travel long distances and regulate the systemic response of the plant to local stresses. In the systemic signaling pathway, the cells on the left are directly stressed cells, and the cells on the right are neighboring cells. The solid lines indicate the known action pathway, the dotted lines indicate the possible action pathway, the yellow dotted lines indicate long-distance transportation, and the gray curve indicates the electrical signal transmission pathway. ROS: Reactive oxygen species; PD: Plasmodesmata; RBOHD: Respiratory burst oxidase homolog D; GLR: Glutamate-like receptor; CPK5: Calmodulin domain protein kinase 5; TPC1: Two pore channel 1; CDPK: Ca2+-dependent protein kinase; MAPK: Mitogen-activated protein kinase; RICR: ROS-induced calcium release; CICR: Calcium-induced calcium release

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