期刊
PLANT PHYSIOLOGY
卷 160, 期 2, 页码 1130-1144出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.112.200741
关键词
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资金
- U.S. Department of Energy, Poplar Genome-Based Research for Carbon Sequestration in Terrestrial Ecosystems [DE-FG02-06ER64185, DE-FG02-05ER64113]
- Consortium for Plant Biotechnology Research [GO12026-203A]
- U.S. Department of Agriculture Cooperative State Research, Education, and Extension Service
- U.S. Department of Agriculture National Research Initiative Plant Genome program [2003-04345]
- Biotechnology Risk Assessment Research Grants Programs [2004-35300-14687]
- Natural Sciences and Engineering Research Council of Canada
Semidwarfism has been used extensively in row crops and horticulture to promote yield, reduce lodging, and improve harvest index, and it might have similar benefits for trees for short-rotation forestry or energy plantations, reclamation, phytoremediation, or other applications. We studied the effects of the dominant semidwarfism transgenes GA Insensitive (GAI) and Repressor of GAI-Like, which affect gibberellin (GA) action, and the GA catabolic gene, GA 2-oxidase, in nursery beds and in 2-year-old high-density stands of hybrid poplar (Populus tremula 3 Populus alba). Twenty-nine traits were analyzed, including measures of growth, morphology, and physiology. Endogenous GA levels were modified in most transgenic events; GA20 and GA8, in particular, had strong inverse associations with tree height. Nearly all measured traits varied significantly among genotypes, and several traits interacted with planting density, including aboveground biomass, root-shoot ratio, root fraction, branch angle, and crown depth. Semidwarfism promoted biomass allocation to roots over shoots and substantially increased rooting efficiency with most genes tested. The increased root proportion and increased leaf chlorophyll levels were associated with changes in leaf carbon isotope discrimination, indicating altered water use efficiency. Semidwarf trees had dramatically reduced growth when in direct competition with wild-type trees, supporting the hypothesis that semidwarfism genes could be effective tools to mitigate the spread of exotic, hybrid, and transgenic plants in wild and feral populations.
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