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Title: Recombinant DNA modification of gibberellin metabolism alters growth rate and biomass allocation in Populus

Journal Article · · Tree Genetics & Genomes

Overexpression of genes that modify gibberellin (GA) metabolism and signaling have been previously shown to produce trees with improved biomass production but highly disturbed development. In order to examine if more subtle types of genetic modification of GA could improve growth rate and modify tree architecture, we transformed a model poplar genotype (Populus tremula × P. alba) with eight genes, including two cisgenes (intact copies of native genes), four intragenes (modified copies of native genes), and two transgenes (from sexually incompatible species), and studied their effects under greenhouse and field conditions. In the greenhouse, four out of the eight tested genes produced a significant and often striking improvement of stem volume, and two constructs significantly modified the proportion of root or shoot biomass. Characterization of GA concentrations in the cisgenic population that had an additional copy of a poplar GA20-oxidase gene showed elevated concentrations of 13-hydroxylated GAs compared to wild-type poplars. In the field, we observed growth improvement for three of the six tested constructs, but it was significantly greater for only one of the constructs, a pRGL:GA20-oxidase intragene. The greenhouse and field responses were highly variable, possibly to due to cross-talk among the GA pathway and other stress response pathways, or due to interactions between the cisgenes and intragenes with highly similar endogenes. Our results indicate that extensive field trials, similar to those required for conventional breeding, will be critical to evaluating the value and pleiotropic effects of GA-modifying genes.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; Oregon State Univ., Corvallis, OR (United States); Commonwealth Scientific and Industrial Research Organisation (CSIRO); Consortium for Plant Biotechnology Research, Inc. (CPBR), St. Simons Island, GA (United States); ArborGen, LLC, Ridgeville, SC (United States); US Dept. of Agriculture (USDA); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
FG02-06ER64185; FG02-05ER64113; GO12026-203A; 04412; 2003-04345; 2004-35300-14687
OSTI ID:
1503042
Alternate ID(s):
OSTI ID: 1434578
Journal Information:
Tree Genetics & Genomes, Journal Name: Tree Genetics & Genomes Vol. 11 Journal Issue: 6; ISSN 1614-2942
Publisher:
Springer Science + Business MediaCopyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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