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פותח על ידי קלירמאש פתרונות בע"מ -
The effect of grain number per ear (sink size) on source activity and its water-relations in wheat
Year:
1988
Source of publication :
Journal of Experimental Botany
Authors :
גולן, גיל
;
.
Volume :
39
Co-Authors:
Blum, A., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
Mayer, J., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
Golan, G., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
Facilitators :
From page:
106
To page:
114
(
Total pages:
9
)
Abstract:
Blum, A., Mayer, J. and Golan, G. 1988. The effect of grain number per ear (sink size) on source activity and its water-relations in wheat.-J. exp. Bot. 39: 106-114.Work was done to evaluate the nature of sink-source relationships in wheat (Triticum aestivum L.), when the strength of the sink was modified by the removal of half of the grain from the ear at about anthesis. The main hypothesis was that sink-source relationship would be modified by water stress and that a weaker sink would improve the drought resistance of the source.Two experiments were performed. The first experiment evaluated the effect of de-graining in two wheat varieties grown in the field. The second experiment (in the greenhouse) evaluated the effect of de-graining in plants subjected to water stress after anthesis by immersing the root system in a solution of polyethylene glycol (6000), as compared with non-stressed controls. In both experiments measurements were performed after de-graining to provide data on leaf gas exchange, leaf water potential, osmotic adjustment of leaves and ears (greenhouse), the percent of stem weight loss as an index of stem reserve mobilization, final root weight (greenhouse) and ear weight components.De-graining caused a decrease in flag leaf stomatal conductance, carbon exchange rate (CER) and transpiration and an increase in flag leaf water potential. These effects were stronger with water stress. De-graining did not affect osmotic adjustment in the flag leaf but induced better adjustment in glumes and awns. De-graining decreased the percent of stem weight loss and increased final root weight, especially under drought stress.A weaker sink was, therefore, considered to improve plant drought resistance in terms of the maintenance of higher leaf water potential, a larger root, a better osmotic adjustment in the ear and, possibly, increased flag leaf longevity. The 'cost' of this improved drought resistance was in reduced flag leaf CER and reduced stem (and root?) reserve mobilization. © 1988 Oxford University Press.
Note:
Related Files :
Awns
Carbon exchange rate
drought resistance
Leaf water potential
Osmotic adjustment
root
stomata
transpiration
yield
עוד תגיות
תוכן קשור
More details
DOI :
10.1093/jxb/39.1.106
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20334
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:35
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Scientific Publication
The effect of grain number per ear (sink size) on source activity and its water-relations in wheat
39
Blum, A., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
Mayer, J., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
Golan, G., Department of Field Crops, Volcani Centre, A.R.O., P.O.B. 6, Bet Dagan, Israel
The effect of grain number per ear (sink size) on source activity and its water-relations in wheat
Blum, A., Mayer, J. and Golan, G. 1988. The effect of grain number per ear (sink size) on source activity and its water-relations in wheat.-J. exp. Bot. 39: 106-114.Work was done to evaluate the nature of sink-source relationships in wheat (Triticum aestivum L.), when the strength of the sink was modified by the removal of half of the grain from the ear at about anthesis. The main hypothesis was that sink-source relationship would be modified by water stress and that a weaker sink would improve the drought resistance of the source.Two experiments were performed. The first experiment evaluated the effect of de-graining in two wheat varieties grown in the field. The second experiment (in the greenhouse) evaluated the effect of de-graining in plants subjected to water stress after anthesis by immersing the root system in a solution of polyethylene glycol (6000), as compared with non-stressed controls. In both experiments measurements were performed after de-graining to provide data on leaf gas exchange, leaf water potential, osmotic adjustment of leaves and ears (greenhouse), the percent of stem weight loss as an index of stem reserve mobilization, final root weight (greenhouse) and ear weight components.De-graining caused a decrease in flag leaf stomatal conductance, carbon exchange rate (CER) and transpiration and an increase in flag leaf water potential. These effects were stronger with water stress. De-graining did not affect osmotic adjustment in the flag leaf but induced better adjustment in glumes and awns. De-graining decreased the percent of stem weight loss and increased final root weight, especially under drought stress.A weaker sink was, therefore, considered to improve plant drought resistance in terms of the maintenance of higher leaf water potential, a larger root, a better osmotic adjustment in the ear and, possibly, increased flag leaf longevity. The 'cost' of this improved drought resistance was in reduced flag leaf CER and reduced stem (and root?) reserve mobilization. © 1988 Oxford University Press.
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