Dynamics of cytoskeleton in differentiation of xylem cells of trees grown under the environmental stress View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2005-2006

FUNDING AMOUNT

3800000.0 JPY

ABSTRACT

The cell division of cambial cells and differentiation of their derivatives in trees produce sustainable wood biomass. The quantity and quality of wood vary depending on the environmental conditions of growth of trees. Trees usually grow under the several environmental stresses such as high or low temperature, drought, acid rain, and ozone etc. Such stresses result in decrease in wood quantity through the inhibition of cambial activity. In this project, we analyzed the cellular mechanism how low temperature, one of environmental stresses, affects the cambial activity and xylem differentiation. Microtubules in active cambial cells depolymerize in response to low temperatures and, thus, it is generally necessary to avoid low temperatures during the fixation of samples. However, we found clear bundles of microtubules in dormant cambial cells in mid-winter, when the temperature was below zero. In addition, microtubules in dormant cambial cells did not depolymerize by the fixation of samples under low temperature. These observations suggest the stability of microtubules in dormant cambium at low temperatures. Such stability might be related to endogenous factors in cambial cells since the cold stability of microtubules can be modified by plant hormones, such as gibberellin and abscisic acid. In addition, it is likely that microtubules in active and dormant cambial cells consist of different isotypes of tubulin whose polymerization exhibits different degrees of cold stability. We conclude that the cold stability of microtubules is closely related to the adaptation to environmental conditions of trees, therefore controlling the quantity and quality of wood biomass. More... »

URL

https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17580137

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