International Journal of Molecular Sciences

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Dear Colleagues,

Plants in the natural environment are constantly challenged by changes in the environment, including abiotic and biotic stresses. Abiotic stresses such as drought, salt, heat, cold, and nutrient deficiency adversely affect plant growth, development, and productivity. Biotic stress, such as bacteria, viruses, fungi, parasites, beneficial and harmful insects, weeds, and cultivated or native plants, is a major focus of agricultural research due to the vast economic losses caused to cash crops. Plants have evolved a series of regulatory mechanisms to cope with stress in the process of adapting to abiotic or biotic stress. Studying the regulatory mechanisms of plant stress tolerance to adversity is beneficial in selecting excellent resistant varieties.

This Special Issue aims to provide a platform for research on the physiology and molecular biology of plant stress tolerance. We believe that this Special Issue will be helpful to researchers and to the improvement of plants’ tolerance to stresses in the future. We welcome your submission of original papers and reviews containing molecular results.

This Special Issue is supervised by Prof. Dr. Deguo Han and assisted by our Topical Advisory Panel Member Dr. Xingguo Li (College of Horticulture & Landscape Architecture, Northeast Agricultural University, Harbin 150030, China).

Prof. Dr. De-Guo Han
Guest Editor

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Keywords

plant–pathogen interactions
biotic and abiotic stress
plant innate immunity
phytohormones
genes

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Research

15 pages, 6971 KiB

Open AccessArticle

Genome-Wide Identification and Expression Analysis of the High-Mobility Group B (HMGB) Gene Family in Plant Response to Abiotic Stress in Tomato

by Jinhui Zheng, Huimeng Tang, Jianquan Wang, Yue Liu, Lianjing Ge, Guobiao Liu, Qinghua Shi and Yan Zhang

Int. J. Mol. Sci. 2024, 25(11), 5850; https://doi.org/10.3390/ijms25115850 - 28 May 2024

Viewed by 185

Abstract

High-mobility group B (HMGB) proteins are a class of non-histone proteins associated with eukaryotic chromatin and are known to regulate a variety of biological processes in plants. However, the functions of HMGB genes in tomato (Solanum lycopersicum) remain largely unexplored. Here, we identified 11 members of the HMGB family in tomato using BLAST. We employed genome-wide identification, gene structure analysis, domain conservation analysis, cis-acting element analysis, collinearity analysis, and qRT-PCR-based expression analysis to study these 11 genes. These genes were categorized into four groups based on their unique protein domain structures. Despite their structural diversity, all members contain the HMG-box domain, a characteristic feature of the HMG superfamily. Syntenic analysis suggested that tomato SlHMGBs have close evolutionary relationships with their homologs in other dicots. The promoter regions of SlHMGBs are enriched with numerous cis-elements related to plant growth and development, phytohormone responsiveness, and stress responsiveness. Furthermore, SlHMGB members exhibited distinct tissue-specific expression profiles, suggesting their potential roles in regulating various aspects of plant growth and development. Most SlHMGB genes respond to a variety of abiotic stresses, including salt, drought, heat, and cold. For instance, SlHMGB2 and SlHMGB4 showed positive responses to salt, drought, and cold stresses. SlHMGB1, SlHMGB3, and SlHMGB8 were involved in responses to two types of stress: SlHMGB1 responded to drought and heat, while SlHMGB3 and SlHMGB8 responded to salt and heat. SlHMGB6 and SlHMGB11 were solely regulated by drought and heat stress, respectively. Under various treatment conditions, the number of up-regulated genes significantly outnumbered the down-regulated genes, implying that the SlHMGB family may play a crucial role in mitigating abiotic stress in tomato. These findings lay a foundation for further dissecting the precise roles of SlHMGB genes. Full article

(This article belongs to the Special Issue Physiology and Molecular Biology of Plant Stress Tolerance)

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