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Background  Glutathione S-transferases (GSTs) have been reported to regulate the plant tolerance to environmental stresses. Many plant GSTs exhibited the roles on promoting tolerance to drought stress, oxidative stress and plant hormones. The biological function of GSTs has been well characterized in  Arabidopsis thaliana  in response to exogenous environmental stresses. However, their regulation function under exogenous environmental stresses regulating leaf abscission in cassava ( Manihot esculenta  Crantz) remained unknown.    Results  Here, 83 GSTs were identified from tropical plant cassava. The amino acid motifs and phylogenetic analyses indicated that MeGSTs were divided into 9 classes. The global expression analyses were carried out to analyze the gene expression patterns of  MeGST  in cassava abscission zones by comparing the  MeGST  genes expression patterns in both ethylene and drought induced cassava leaf abscission. Totally, 34  GST s were detected to express in both ethylene and drought induced leaf abscission in cassava abscission zones. Comparison of  GST  expression profiling between ethylene and drought induced leaf abscission suggested that Tau  GST  genes showed with the similar expression in both treatments induced leaf abscission in cassava abscission zone. GO annotation indicated that all 17 Tau  GST  genes participated in the pathway of toxin catabolism (GO: 0009407). The expression levels of 17 Tau  MeGST  genes were analyzed in two cassava cultivars, ‘SC124’ and ‘Arg7’, the two cultivars exhibit different levels of leaf abscission when suffered from the same environmental stress. Higher expression levels of Tau  MeGST s were detected in the precocious abscission Arg7 cultivar, while lower expression levels in delayed abscission SC124 cultivar. All the results indicated that Tau  MeGSTs  have the function in regulation the cassava leaf abscission under environmental stresses.    Conclusion  Analysis of the expression patterns of  GST s in various abscission-promoting treatments in cassava abscission zones helps us to understand the possible roles of  GST s in cassava leaf abscission.    Electronic supplementary material  The online version of this article (10.1186/s12863-018-0627-6) contains supplementary material, which is available to authorized users.

bmc genomic data

Tau GSTs involved in regulation of leaf abscission by comparison the gene profiling of MeGSTs in various abscission-promoting treatments in cassava abscission zones