genome-wide survey reveals transcriptional differences underlying the contrasting trichome phenotypes of two sister desert poplars
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2016
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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.
| Reference Key |
ma2016genesgenome-wide
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| Authors | ;Jianchao Ma;Xiaodong He;Xiaotao Bai;Zhimin Niu;Bingbing Duan;Ningning Chen;Xuemin Shao;Dongshi Wan |
| Journal | thermal science and engineering progress |
| Year | 2016 |
| DOI |
10.3390/genes7120111
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