Overexpression of a pine Dof transcription factor in hybrid poplars:A comparative study in trees growing under controlled and natural conditions

Rueda-López, Marina and Pascual, Maria Belen and Pallero, Mercedes and Henao, Luisa Maria and Lasa, Berta and Jauregui, Ivan and Aparicio-Tejo, Pedro Mª. and Canovas, Francisco M. and Avila, Concepción (2017) Overexpression of a pine Dof transcription factor in hybrid poplars:A comparative study in trees growing under controlled and natural conditions. PLoS ONE, 12 (4). ISSN 1932-6203

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Abstract

In this work, the role of the pine transcriptional regulator Dof 5 in carbon and nitrogen metabolism has been examined in poplar trees. The overexpression of the gene and potential effects on growth and biomass production were compared between trees growing in a growth chamber under controlled conditions and trees growing in a field trial during two growth seasons. Ten-week-old transgenic poplars exhibited higher growth than untransformed controls and exhibited enhanced capacity for inorganic nitrogen uptake in the form of nitrate. Furthermore, the transgenic trees accumulated significantly more carbohydrates such as glucose, fructose, sucrose and starch. Lignin content increased in the basal part of the stem likely due to the thicker stem of the transformed plants. The enhanced levels of lignin were correlated with higher expression of the PAL1 and GS1.3 genes, which encode key enzymes involved in the phenylalanine deamination required for lignin biosynthesis. However, the results in the field trial experiment diverged from those observed in the chamber system. The lines overexpressing PpDof5 showed attenuated growth during the two growing seasons and no modification of carbon or nitrogen metabolism. These results were not associated with a decrease in the expression of the transgene, but they can be ascribed to the nitrogen available in the field soil compared to that available for growth under controlled conditions. This work highlights the paramount importance of testing transgenic lines in field trials.

Item Type:
Journal Article
Journal or Publication Title:
PLoS ONE
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2700
Subjects:
ID Code:
86683
Deposited By:
Deposited On:
13 Jun 2017 14:02
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 03:33