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Genome-wide identification and comparative evolutionary analysis of sorbitol metabolism pathway genes in four Rosaceae species and three model plants
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Genome-wide identification and comparative evolutionary analysis of sorbitol metabolism pathway genes in four Rosaceae species and three model plants
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Journal Article
Genome-wide identification and comparative evolutionary analysis of sorbitol metabolism pathway genes in four Rosaceae species and three model plants
2022
Overview
In contrast to most land plant species, sorbitol, instead of sucrose, is the major photosynthetic product in many Rosaceae species. It has been well illustrated that three key functional genes encoding sorbitol-6-phosphate dehydrogenase (
S6PDH
), sorbitol dehydrogenase (
SDH
), and sorbitol transporter (
SOT
), are mainly responsible for the synthesis, degradation and transportation of sorbitol. In this study, the genome-wide identification of
S6PDH
,
SDH
and
SOT
genes was conducted in four Rosaceae species, peach, mei, apple and pear, and showed the sorbitol bio-pathway to be dominant (named sorbitol present group, SPG); another three related species, including tomato, poplar and
Arabidopsis
, showed a non-sorbitol bio-pathway (named sorbitol absent group, SAG). To understand the evolutionary differences of the three important gene families between SAG and SPG, their corresponding gene duplication, evolutionary rate, codon bias and positive selection patterns have been analyzed and compared. The sorbitol pathway genes in SPG were found to be expanded through dispersed and tandem gene duplications. Branch-specific model analyses revealed
SDH
and
S6PDH
clade A were under stronger purifying selection in SPG. A higher frequency of optimal codons was found in
S6PDH
and
SDH
than that of
SOT
in SPG, confirming the purifying selection effect on them. In addition, branch-site model analyses revealed
SOT
genes were under positive selection in SPG. Expression analyses showed diverse expression patterns of sorbitol-related genes. Overall, these findings provide new insights in the evolutionary characteristics for the three key sorbitol metabolism-related gene families in Rosaceae and other non-sorbitol dominant pathway species.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ apples
/ Biomedical and Life Sciences
/ Codons
/ Enzymes
/ Fruits
/ Genes
/ Genomes
/ Glucose
/ peaches
/ pears
/ Poplar
/ Populus
/ Proteins
/ Rosaceae
/ Sorbitol
/ Sorbitol dehydrogenase (SDH)
/ sorbitol-6-phosphate 2-dehydrogenase
/ Sorbitol-6-phosphate dehydrogenase
/ Sorbitol-6-phosphate dehydrogenase (S6PDH)
/ Species
/ Sucrose
/ Tomatoes
/ Trees
