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Genome-wide identification and characterization of TIFY family genes in Moso Bamboo ( Phyllostachys edulis ) and expression profiling analysis under dehydration and cold stresses.
PeerJ 2016
The proteins containing the TIFY domain belong to a plant-specific family of putative transcription factors and could be divided into four subfamilies: ZML, TIFY, PPD and JAZ. They not only function as key regulators of jasmonate hormonal response, but are also involved in responding to abiotic stress. In this study, we identified 24 TIFY genes ( PeTIFYs ) in Moso bamboo ( Phyllostachys edulis ) of Poaceae by analyzing the whole genome sequence. One PeTIFY belongs to TIFY subfamily, 18 and five belong to JAZ and ZML subfamilies, respectively. Two equivocal gene models were re-predicted and a putative retrotransposition event was found in a ZML protein. The distribution and conservation of domain or motif, and gene structure were also analyzed. Phylogenetic analysis with TIFY proteins of Arabidopsis and Oryza sativa indicated that JAZ subfamily could be further divided to four groups. Evolutionary analysis revealed intragenomic duplication and orthologous relationship between P. edulis , O. sativa , and B. distachyon . Calculation of the non-synonymous (Ka) and synonymous (Ks) substitution rates and their ratios indicated that the duplication of PeTIFY may have occurred around 16.7 million years ago (MYA), the divergence time of TIFY family among the P. edulis - O. sativa , P. edulis - B. distachyon, and O. sativa-B. distachyon was approximately 39 MYA, 39 MYA, and 45 MYA, respectively. They appear to have undergone extensive purifying selection during evolution. Transcriptome sequencing revealed that more than 50% of PeTIFY genes could be up-regulated by cold and dehydration stresses, and some PeTIFYs also share homology to know TIFYs involved in abiotic stress tolerance. Our results made insights into TIFY family of Moso bamboo, an economically important non-timber forest resource, and provided candidates for further identification of genes involved in regulating responses to abiotic stress.
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