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Dehydrins (DHNs) play imperative role in the stress tolerance of high plants. In this study, the YSK 2 -type DHN (NnDHNl) and SK 3 -type DHN (NnDHN2) were investigated. The putative NnDHNl and NnDNH2 shared conserved S-segment as well as K-segment, with distinct isoelectric points, kinase selectivities and number of functional motifs. Phylogenetic analysis revealed that NnDHNs were grouped with Y n SK n - and SK n -type of DHNs in high plants. Additionally, NnDHN1  mRNA was only expressed in leaves and embryo.  NnDHN2  mRNA was found in embryo, leaves, rhizome and leafstalk. NnDHNs  mRNAs were not detected in root of  N .  nucifera . Real-time PCR assay demonstrated that the levels of  NnDHN1  and  NnDHN2  mRNAs were significantly elevated during cold temperature, while both were relatively stable in response to high temperature. Moreover,  NnDHN2  mRNA was significantly increased after treatment with abscisic acid (ABA) or indole-3-acetic acid (IAA), while  NnDHN1  mRNA was induced by ABA treatment with little change in response to IAA. These results illustrate two  NnDHNs  with partially overlapping function which exhibit different stress responsiveness.

Identification and expression analyses of two lotus ( Nelumbo nucifera ) dehydrin genes in response to adverse temperatures, ABA and IAA treatments