Genome-Wide Identification of the Gene Family in Poplar and Their Responses to Abiotic Stresses.

The () gene family is a plant-specific, oligomeric, filamentous family protein located on the cell membrane, which is important for plant growth and stress responses. In this study, a total of 22 were identified in the genome of . Subcellular localization analysis showed that they were predictively distributed in the cell membrane and nucleus. Only five PtREMs members contain both Remorin_C- and Remorin_N-conserved domains, and most of them only contain the Remorin_C domain. A total of 20 gene duplication pairs were found, all of which belonged to fragment duplication. Molecular evolutionary analysis showed the have undergone purified selection. Lots of -acting elements assigned into categories of plant growth and development, stress response, hormone response and light response were detected in the promoters of . showed distinct gene expression patterns in response to diverse stress conditions where the mRNA levels of , and were induced in most cases. A co-expression network centered by was constructed to uncover the possible functions of in protein modification, microtube-based movement and hormone signaling. The obtained results shed new light on understanding the roles of in coping with environmental stresses in poplar species.