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Important gene controlling tree growth and development found

t the end of summer or early fall. Decidious trees also shed their leaves. The tree is now dormant and is as such much more resistant to drought and frost than if it had been actively growing.

It has been known for a long time that the trees sense that fall is coming by measuring the length of the day. When the days get shorter the trees "know" that it is time to stop growing and set buds, even if it is a very warm fall. The trees are known to display a "critical daylength". If the days get shorter than this critical daylength the tree responds with growth cessation and bud set. The further north the trees grow the more important it is to stop growing and form buds sufficiently early in late summer. This means that trees originating from different latitudes (different origins in the north to south direction, so called "provenances", display different critical daylengths. For instance, an aspen tree from the middle of Germany stops growing and sets buds when the days get shorter than 16 hours. Compare this with a tree from northern Sweden which stops growing and prepares for winter already when the days get shorter than 21 hours long. Trees from northern Norway can even display critical daylengths of 23 hours! This trait is genetically inherited and is kept if the tree is moved to a new climate.

How the trees control their flowering, and why trees set bud at a certain time in the fall have been important questions for the scientists to answer. This is for two reasons. These are important traits that "makes a tree into a tree". There is a considerable applied interest in these traits. If one can induce early tree flowering it should be possible to dramatically enhance the speed of forest tree breeding. Plant breeding has been extremely successful for the development of superior plant material for agriculture. It has, however, had a small impact on forestry. To a large extent this has been caused by the fact that a forest tree breeder has to wait for 1
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Source:Swedish Research Council


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Goat polyclonal to SIAH Interacting Protein ( Abpromise for all tested applications).
Rabbit polyclonal to Phosphothreonine-X-Phosphotyrosine (HRP) ( Abpromise for all tested applications).
Rat integrin a6b1, mainly associated with epithelial cells. Does not react with rat fibroblasts.
Rabbit polyclonal to MDM2 (phospho S185) ( Abpromise for all tested applications). entrezGeneID: 4193 SwissProtID: Q00987
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