Abstract
Magnesium (Mg) is an element involved in various key cellular processes in plants. Mg transporter (MGT) genes play an important role in magnesium distribution and ionic balance maintenance. Here, MGT family members were identified and characterized in three species of the plant family Malvaceae, Theobroma cacao, Corchorus capsularis, and Gossypium hirsutum, to improve our understanding of their structure, regulatory systems, functions, and possible interactions. We identified 18, 41, and 16 putative non-redundant MGT genes from the genome of T. cacao, G. hirsutum, and C. capsularis, respectively, which clustered into three groups the maximum likelihood tree. Several segmental/tandem duplication events were determined between MGT genes. MGTs appear to have evolved slowly under a purifying selection. Analysis of gene promoter regions showed that MGTs have a high potential to respond to biotic/abiotic stresses and hormones. The expression patterns of MGT genes revealed a possible role in response to P. megakarya fungi in T. cacao, whereas MGT genes showed differential expression in various tissues and response to several abiotic stresses, including cold, salt, drought, and heat stress in G. hirsutum. The co-expression network of MGTs indicated that genes involved in auxin-responsive lipid metabolism, cell wall organization, and photoprotection can interact with MGTs.
Highlights
Magnesium (Mg) is a critical bimetal that regulates biochemical processes and provides stability to membranes in plants [1,2]
Our findings revealed that Mg transporter (MGT) in the three studied plant species are diverse in sequence length, molecular weight (MW), isoelectric point, and exon number (Table S2)
Due to the important role of magnesium ions in regulating plant growth and development, important role oftransporters magnesium(MGTs) ions in regulating growth and magnesium have beenplant investigated in development, cacao, upland magnesium cotton transporters have in cacao, upland (Gossypium hirsutum), (Gossypium (MGTs) hirsutum), andbeen whiteinvestigated jute (Corchorus capsularis)
Summary
Magnesium (Mg) is a critical bimetal that regulates biochemical processes and provides stability to membranes in plants [1,2]. Magnesium acts as a cofactor for polymerase, kinase, and H+-ATPase, which are necessary for synthesizing proteins and nucleic acid and for generating energy [3,4]. Plants have developed an efficient transport system for absorption, storage, and Mg translocation [2]. The Mg transporter (MGT) gene family, known as MRS2 or CorA, has an important role in the aforementioned essential functions [9,10]. Members of the MGT family are defined by two transmembrane domains in which a tripeptide motif GMN (glycine–methionine–asparagine) occurs at the
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