Partitioning of carbon in split root systems of barley: effect of temperature of the root

The time-course of partitioning of recently fixed photosynthate to a barley root was followed during a step change in the temperature of the root. The induced change in partitioning had a response time of about 1 h, whilst the change in respiratory loss from the root of labelled and unlabelled CO wa...

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Bibliographic Details
Published in:Journal of experimental botany 1994-08, Vol.45 (8), p.1103-1109
Main Authors: Minchin, P.E.H., Farrar, J.F., Thorpe, M.R.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Barley
Biological and medical sciences
Carbon partitioning
Cooling
Economic plant physiology
Field of view
Fundamental and applied biological sciences. Psychology
Hordeum vulgare L
Imports
Metabolism
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
Nutrition. Photosynthesis. Respiration. Metabolism
Phloem
Photosynthesis, respiration. Anabolism, catabolism
Plant physiology and development
Plant roots
Plants
Respiration
Root systems
roots
Seedlings
temperature
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Summary:The time-course of partitioning of recently fixed photosynthate to a barley root was followed during a step change in the temperature of the root. The induced change in partitioning had a response time of about 1 h, whilst the change in respiratory loss from the root of labelled and unlabelled CO was much faster. These observations suggest that while a sudden temperature change has an immediate effect upon the metabolic rate of the roots it is not the metabolic rate as such which influences import (sink strength). The reported temperature responses are consistent with the supposition that the size of the cytosolic pool of sugar in the root, which is supplied directly by phloem import and used as a substrate for root metabolism, appears to control import into the root.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/45.8.1103