NDLI: Repression of gibberellin biosynthesis or signaling produces striking alterations in poplar growth, morphology, and flowering

Content Provider	Springer Nature Link
Author	Zawaski, Christine Kadmiel, Mahita Pickens, Jim Ma, Cathleen Strauss, Steven Busov, Victor
Copyright Year	2011
Abstract	We modified gibberellin (GA) metabolism and signaling in transgenic poplars using dominant transgenes and studied their effects for 3 years under field conditions. The transgenes that we employed either reduced the bioactive GAs, or attenuated their signaling. The majority of transgenic trees had significant and in many cases dramatic changes in height, crown architecture, foliage morphology, flowering onset, floral structure, and vegetative phenology. Most transgenes elicited various levels of height reduction consistent with the roles of GA in elongation growth. Several other growth traits were proportionally reduced, including branch length, internode distance, and leaf length. In contrast to elongation growth, stem diameter growth was much less affected, suggesting that semi-dwarf trees in dense stands might provide high levels of biomass production and carbon sequestration. The severity of phenotypic effects was strongly correlated with transgene expression among independent transgenic events, but often in a non-linear manner, the form of which varied widely among constructs. The majority of semi-dwarfed, transgenic plants showed delayed bud flush and early bud set, and expression of a native GAI transgene accelerated first time flowering in the field. All of the phenotypic changes observed in multiple years were stable over the 3 years of field study. Our results suggest that transgenic modification of GA action may be useful for producing semi-dwarf trees with modified growth and morphology for horticulture and other uses.
Starting Page	1285
Ending Page	1298
Page Count	14
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	234
Issue Number	6
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-07-27
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hormones Populus Growth Gibberellin Forestry Ecology Plant Sciences Agriculture
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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