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Two genes encoding putative glutathione  S -transferase proteins were isolated from pear ( Pyrus pyrifolia ) and designated  PpGST1  and  PpGST2 . The deduced PpGST1 and PpGST2 proteins contain conserved Glutathione S-transferase N-terminal domain (GST_N) and Glutathione S-transferase, C-terminal domain (GST_C). Using PCR amplification technique, the genomic clones corresponding to  PpGST1  and  PpGST2  were isolated and shown to contain two introns and a singal intron respectively with typical GT/AG boundaries defining the splice junctions. Phylogenetic analysis clearly demonstrated that PpGST1 belonged to Phi class of GST superfamilies and had high homology with apple MdGST, while PpGST2 was classified into the Tau class of GST superfamilies. The expression of  PpGST1  and  PpGST2  genes was developmentally regulated in fruit. Further study demonstrated that  PpGST1  and  PpGST2  expression was remarkably induced by glucose, salicylic acid (SA) and indole-3-aceticacid (IAA) treatments in pear fruit, and in diseased fruit. These data suggested that  PpGST1  and  PpGST2  might be involved in response to sugar, SA, and IAA signaling during fruit development of pear.

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Two Pear Glutathione S-Transferases Genes Are Regulated during Fruit Development and Involved in Response to Salicylic Acid, Auxin, and Glucose Signaling