Carbon dioxide balance of sunflower ( Helianthus annuus) subjected to water stress during grain-filling

Sunflower subjected to water stress during grain-filling showed an immediate decrease in gross CO 2 assimilation ( P G) attributable to a rapid loss of leaf area and a decreased efficiency of utilization of light in CO 2 assimilation. The relationship between light-use efficiency and leaf-area index...

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Bibliographic Details
Published in:Field crops research 1989, Vol.20 (1), p.65-80
Main Authors: Whitfield, D.M., Connor, D.J., Hall, A.J.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
CARBON DIOXIDE
CROP YIELD
DIOXIDO DE CARBONO
DIOXYDE DE CARBONE
Economic plant physiology
Fundamental and applied biological sciences. Psychology
GRAIN
GRANOS
HELIANTHUS ANNUUS
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
Nutrition. Photosynthesis. Respiration. Metabolism
PRIVACION DEL AGUA
PRIVATION D'EAU
RENDEMENT DES CULTURES
RENDIMIENTO DE CULTIVOS
STRESS
WATER DEPRIVATION
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Summary:Sunflower subjected to water stress during grain-filling showed an immediate decrease in gross CO 2 assimilation ( P G) attributable to a rapid loss of leaf area and a decreased efficiency of utilization of light in CO 2 assimilation. The relationship between light-use efficiency and leaf-area index differed between the pre- and post-anthesis periods, but no effect of stress on the post-anthesis relationship could be detected. In contrast to P G, daily respiration losses of the well-watered control were only slightly greater than those of the stressed treatment, although total respiration losses over the entire grain-filling period were larger because of a greater leaf-area duration. Rates of respiration measured during grain-filling ranked with the highest previously reported. Total respiration after anthesis accounted for ca. 60% of P G in both treatments after accounting for only 24% during vegetative growth. Respiration therefore assumed considerable importance in the CO 2 balance of both treatments during grain-filling. Both direct and indirect measurements of head respiration showed that most of the high rates of respiration during this period were attributable to the respiratory activity of the grain and receptacle.
ISSN:0378-4290
1872-6852
DOI:10.1016/0378-4290(89)90024-5