Abstract
The MYC genes are a group of transcription factors containing both bHLH and ZIP motifs that play important roles in the regulation of abscisic acid (ABA)-responsive genes. In the present study, to investigate the roles of MYC genes under NaCl, osmotic and ABA stress conditions, nine MYC genes were cloned from Tamarix hispida. Real-time reverse-transcriptase (RT)-PCR showed that all nine MYC genes were expressed in root, stem and leaf tissues, but that the levels of the transcripts of these genes in the various tissues differed notably. The MYC genes were highly induced in the roots in response to ABA, NaCl and osmotic stresses after 3 h; however, in the stem and leaf tissues, MYC genes were highly induced only when exposed to these stresses for 6 h. In addition, most of these MYC genes were highly expressed in roots in comparison with stems and leaves. Furthermore, the MYC genes were more highly induced in roots than in stem and leaf tissues, indicating that these genes may play roles in stress responses mainly in the roots rather than the stems and leaves. The results of this present study suggest that MYCs are involved in salt and osmotic stress tolerances and are controlled by the ABA signal transduction pathway.
Highlights
MYCs are a group of transcription factors found in plants and animals [1]
MYC2 plays an important role in the regulation of jasmonic acid (JA)- and abscisic acid (ABA)-responsive genes [3,4,5,6]
Nine unique MYC genes were identified from transcriptomes of T. hispida
Summary
MYCs (myelocytomatosis proteins) are a group of transcription factors found in plants and animals [1]. MYC transcription factors are involved in many biological processes, including important roles in the regulation of abiotic stress tolerance. The ability of T. hispida to thrive in arid and saline soils indicates that this species has molecular and physiological systems that enable it to adapt and tolerate these stressful conditions, making it a desirable species for investigations into salt and drought tolerance in plants. In this present study, nine unique MYC genes were cloned from T. hispida, and phylogenetic analysis was performed to uncover the genetic relationships between these genes. This study provides further insights into the roles of MYCs in abiotic stress tolerance in plants
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