Genome-Enabled Analyses Reveal Roles of Mangrove Homeobox Superfamily in Response to Salinity

文献类型： 外文期刊

第一作者： Chen, Tingting

作者： Chen, Tingting;Chen, Tingting;Ye, Xiuxu;Wang, Peng;Feng, Erhui;Zhang, Yu;Wang, Peng

作者机构：

关键词： Homeobox superfamily; Rhizophoraceae; Mangrove; Salinity stress

期刊名称：TROPICAL PLANT BIOLOGY （ 影响因子：1.4； 五年影响因子：1.7 ）

ISSN： 1935-9756

年卷期： 2025 年 18 卷 1 期

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收录情况： SCI

摘要： The homeobox superfamily, a group of plant-specific transcription factors, plays crucial roles in promoting plant abiotic resistance. In this study, we performed comprehensive identification and genome-enabled analysis of the homeobox superfamily members in Ceriops tagal, Rhizophora apiculata and Bruguiera parviflora. All the species belong to Rhizophoraceae, a mangrove family recognized for its resilience against salinity stress. Our aim was to investigate the gene number, phylogeny topology, and co-synteny of the homeobox superfamily in Rhizophoraceae and to explore their contribution to salinity tolerance in mangroves. We detected a total of 225 homeobox genes from three high-quality mangrove genomes and 214 genes from the genomes of outgroup species. Phylogenetic analysis indicated that the homeobox superfamily can be classified into three independent classes, Classes I, II, and III, in addition to several basal clades. It is likely that the members of Classes I and II encode homeobox-leucine zipper proteins, while the genes in Class III encode WUSCHEL-related homeobox proteins. The gene counts for the three classes and the total number of genes were found to be remarkably similar among the mangrove species. In the R. apiculata genome, 76 genes were located on all 18 chromosomes, with a fraction positioned in proximity to each other. Co-synteny blocks were detected between the genomes of R. apiculata and C. tagal, two mangrove species, with 11 genes located within these blocks. However, four Class I genes lost co-synteny when analyzing between mangrove species and outgroups. Expression analysis in roots and leaves, as revealed by a combination of RNASeq analysis and quantitative RT-PCR, showed up-regulation of expression of two Class I genes in roots, and the expression of a Class I gene was elevated in leaves with the salinity treatment. These results suggest that the Class I members of the superfamily play important roles in the early stage of responses against salinity. Our findings offer insights into the mechanisms underlying salinity tolerance in mangroves and provide a potential target for the development of crops that can better adapt to salt stresses.

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