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Increased gibberellin biosynthesis in transgenic trees promotes growth, biomass production and xylem fiber length.

Abstract：

:In most tree-breeding programs worldwide, increasing the trees' growth rates and stem volumes and shortening their rotation times are important aims. Such trees would yield more biomass per unit area. Here we show that overexpressing a key regulatory gene in the biosynthesis of the plant hormone gibberellin (GA) in hybrid aspen (Populus tremula x P. tremuloides) improves growth rate and biomass. In addition, these transgenic trees have more numerous and longer xylem fibers than unmodified wild-type (wt) plants. Long fibers are desirable in the production of strong paper, but it has not as yet proved possible to influence this trait by traditional breeding techniques. We also show that GA has an antagonistic effect on root initiation, as the transgenic lines showed poorer rooting than the control plants when potted in soil. However, the negative effect on rooting efficiencies in the initial establishment of young plantlets in the growth chamber did not significantly affect root growth at later stages.

journal_name

Nat Biotechnol

journal_title

Nature biotechnology

authors

Eriksson ME,Israelsson M,Olsson O,Moritz T

doi

10.1038/77355

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

784-8

issue

7

eissn

1087-0156

issn

1546-1696

journal_volume

18

pub_type

杂志文章

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