Abstract
Key messageWoody plants have salt-tolerant mechanisms similar to those developed by non-woody plants. Among others, compartmentalization of ions, production of compatible solutes, synthesis of specific proteins and metabolites, and induction of transcriptional factors are the most relevant. Woody plant-associated microbial interactions as well as naturally stress-adapted trees are resources that deserve to be deepened to fully understand the tolerance mechanisms.ContextThe high variability of salinity responses found in woody plants implies a high potentiality for germplasm selection and breeding. Salt tolerance mechanisms of plants are regulated by numerous genes, which control ion homeostasis, production of compatible solutes and specific proteins, and activation or repression of specific transcription factors. Despite the fact that numerous studies have been done on herbaceous model plants, knowledge about salt tolerance mechanisms in woody plants is still scarce.AimsThe present review critically evaluates molecular control of salt tolerance mechanisms of woody plants, focusing on the regulation and compartmentalization of ions, production of compatible solutes, activation of transcription factors, and differential expression of stress response-related proteins, including omics-based approaches and the role of plant-microbial interactions. The potential identification of genes from naturally stress-adapted woody plants and the integration of the massive omics data are also discussed.ConclusionIn woody plants, salt tolerance mechanisms seem not to diverge to those identified in non-woody plants. More comparative studies between woody and non-woody salt tolerance plants will be relevant to identify potential molecular mechanisms specifically developed for wood plants. In this sense, the activation of metabolic pathways and molecular networks by novel genetic engineering techniques is key to establish strategies to improve the salt tolerance in woody plant species and to contribute to more sustainable agricultural and forestry systems.
Highlights
New developments in agriculture have allowed obtaining higher crop yield and quality, which has optimized the cultivable land area around the world
This ionic homeostasis is reached by action of several genes encoding plasma membrane and vacuolar H + -ATPases, vacuolar H + -pyrophosphatase, cation/proton antiporters on the plasma membrane and vacuolar membrane, and other genes involved in salt tolerance mechanisms (Ma et al 2016), which allowed to display a set of potential genes to be used in breeding programs
Results of this study suggested that the expression of NHX1 increases both in shoots and roots depending on abscisic acid, confirming the participation of Na + /H + exchanger (NHX) family genes in the responses to abiotic conditions of E. grandis plants (García et al 2019)
Summary
New developments in agriculture have allowed obtaining higher crop yield and quality, which has optimized the cultivable land area around the world. Soil salinization is a widespread environmental constraint for plants, in which salts are highly deposited in the soil to an extent that affects plant biomass production and agricultural economies (FAO 2017). Given the growing water scarcity and the increasing salt-affected land area, the ability of crop plants to tolerate high levels of salinity in the soils is an agriculturally useful trait
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