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Seasonal shifts in dormancy status, carbohydrate metabolism, and related gene expression in crown buds of leafy spurge

Permanent URL:
http://handle.nal.usda.gov/10113/14526
File:
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Abstract:
Crown buds of field-grown leafy spurge (Euphorbia esula L.) were examined to determine relationships between carbohydrate metabolism and gene expression throughout para-, endo-, and eco-dormancy during the transition from summer, autumn, and winter, respectively. The data indicates that endo-dormancy plays a role in preventing new shoot growth during the transition from autumn to winter. Cold temperature was involved in breaking endo-dormancy, inducing flowering competence, and inhibiting shoot growth. An inverse relationship developed between starch and soluble sugar (mainly sucrose) content in buds during the shift from para- to endo-dormancy, which continued through eco-dormancy. Unlike starch content, soluble sugars were lowest in crown buds during para-dormancy but increased over two- to three-fold during the transition to endo-dormancy. Several genes (AGPase, HK, SPS, SuSy, and UGPase) coding for proteins involved in sugar metabolism were differentially regulated in conjunction with well-defined phases of dormancy in crown buds. Marker genes for S-phase progression, cell wall biochemistry, or responsive to auxin were also differentially regulated during transition from para-, endo-, and eco-dormancy. The results were used to develop a model showing potential signalling pathways involved in regulating seasonal dormancy status in leafy spurge crown buds.
Author(s):
Anderson, J.V. , Gesch, R.W. , Chao, W.S. , Horvath, D.P.
Subject(s):
Euphorbia esula , plant growth , plant development , buds , dormancy , dormancy breaking , carbohydrate metabolism , carbohydrate content , biochemical pathways , starch , sugars , plant proteins , messenger RNA , gene expression regulation , seasonal variation , cold stress , plant biochemistry , plant physiology , plant ecology , plant genetics , nucleotide sequences
Format:
p. 1567-1578.
Note:
Includes references
Source:
Plant, cell and environment 2005 Dec., v. 28, no. 12
Language:
English
Year:
2005
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.