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Title: Characterization of the Populus Rab family genes and the function of PtRabE1b in salt tolerance

Journal Article · · BMC Plant Biology
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Chinese Academy of Forestry, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Chinese Academy of Forestry, Beijing (China)
  3. McGill Univ., Montreal, QC (Canada)

Background: Rab proteins form the largest family of the Ras superfamily of small GTP-binding proteins and regulate intracellular trafficking pathways. However, the function of the Rab proteins in woody species is still an open question. Results: Here, a total of 67 PtRabs were identified in Populus trichocarpa and categorized into eight subfamilies (RabA-RabH). Based on their chromosomal distribution and duplication blocks in the Populus genome, a total of 27 PtRab paralogous pairs were identified and all of them were generated by whole-genome duplication events. Combined the expression correlation and duplication date, the PtRab paralogous pairs that still keeping highly similar expression patterns were generated around the latest large-scale duplication (~ 13 MYA). The cis-elements and co-expression network of unique expanded PtRabs suggest their potential roles in poplar development and environmental responses. Subcellular localization of PtRabs from each subfamily indicates each subfamily shows a localization pattern similar to what is revealed in Arabidopsis but RabC shows a localization different from their counterparts. Furthermore, we characterized PtRabE1b by overexpressing its constitutively active mutant PtRabE1b(Q74L) in poplar and found that PtRabE1b(Q74L) enhanced the salt tolerance. Conclusions: These findings provide new insights into the functional divergence of PtRabs and resources for genetic engineering resistant breeding in tree species.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1626849
Journal Information:
BMC Plant Biology, Vol. 18, Issue 1; ISSN 1471-2229
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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