PMC:1574314 / 35008-36501 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/1574314","sourcedb":"PMC","sourceid":"1574314","source_url":"https://www.ncbi.nlm.nih.gov/pmc/1574314","text":"The expression profiles of the paralogous PtMPK6-1 and 6-2 genes differ from what has been reported for the putative orthologous tobacco genes, NtSIPK and Ntf4. While NtSIPK is expressed in leaves [19], stem and pollen [14], Ntf4 expression was found to be restricted to seeds, pollen and anthers [38] and notably, Ntf4 expression was not detected in female structures (ovaries and pistil) in the tobacco hermaphrodite flower. This suggests that specialized functions might have been acquired by one or both tobacco paralogs. On the other hand, since both paralogs are expressed in pollen, co-activation by the same MKK, NtMEK2, as well as the absence of phenotype after the silencing of Ntf4 [14], point to some level of genetic redundancy of these MAPKs in this particular organ. For poplar, despite the predominance in TA for PtMPK6-1 over PtMPK6-2 in all types of buds, in male and female flowers, there is no evidence of strikingly different patterns of expression. In fact, PtMPK6-1 and PtMPK6-2 display similar TA for most organs, suggestive of overall redundancy. Further investigation will be needed to evaluate the impact of this discrepancy in expression profiles between presumed orthologous tobacco and poplar genes. Interestingly, in a recent publication, NtSIPK and Ntf4 were both detected in leaf extracts using antibodies [59]. This contrasts with previously published data [38] and suggests that at least in leaves, both NtSIPK and Ntf4 display redundant expression profiles.","tracks":[]}