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Genes 2016, 7(12), 111; doi:10.3390/genes7120111

Genome-Wide Survey Reveals Transcriptional Differences Underlying the Contrasting Trichome Phenotypes of Two Sister Desert Poplars

State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: J. Peter W. Young
Received: 22 July 2016 / Revised: 24 November 2016 / Accepted: 24 November 2016 / Published: 1 December 2016
(This article belongs to the Section Population and Evolutionary Genetics and Genomics)
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Abstract

Trichomes, which are widely used as an important diagnostic characteristic in plant species delimitation, play important roles in plant defense and adaptation to adverse environments. In this study, we used two sister poplar species, Populus pruinosa and Populus euphratica—which have, respectively, dense and sparse trichomes—to examine the genetic differences associated with these contrasting phenotypes. The results showed that 42 and 45 genes could be identified as candidate genes related to trichomes in P. pruinosa and P. euphratica, respectively; most of these genes possessed high degrees of diversification in their coding sequences, but they were similar in intron/exon structure in the two species. We also found that most of the candidate trichome genes were expressed at higher levels in P. pruinosa, which has dense trichomes, than in P. euphratica, where there are few trichomes. Based on analyses of transcriptional profiles, a total of 195 genes, including many transcription factors, were found to show distinct differences in expression. The results of gene function annotation suggested that the genes identified as having contrasting levels of expression level are mainly associated with trichome elongation, ATPase activity, and hormone transduction. Changes in the expression of these and other related genes with high sequence diversification may have contributed to the contrast in the pattern of trichome phenotypes between the two species. View Full-Text
Keywords: P. euphratica; P. pruinosa; trichome; C2H2; MYB; bHLH; differentially expressed genes P. euphratica; P. pruinosa; trichome; C2H2; MYB; bHLH; differentially expressed genes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ma, J.; He, X.; Bai, X.; Niu, Z.; Duan, B.; Chen, N.; Shao, X.; Wan, D. Genome-Wide Survey Reveals Transcriptional Differences Underlying the Contrasting Trichome Phenotypes of Two Sister Desert Poplars. Genes 2016, 7, 111.

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