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Maintenance and growth respiration in shoots and roots of sunflower plants grown at different root temperatures
Author(s) -
Szaniawski R. K.,
Kielkiewicz M.
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb00716.x
Subject(s) - shoot , respiration , sunflower , helianthus annuus , biology , dry matter , horticulture , botany , agronomy
Continuous measurements of CO 2 ‐evolution and dry matter accumulation were carried out on shoots and roots separately of intact Helianthus annuus L. cv. Autumn Beauty plants grown in nutrient solution at different root temperatures. The data were used to distinguish between growth and maintenance components of respiration. The maintenance and growth coefficients were higher in the root system than in the shoots. The overall efficiency of assimilate utilization was within the range reported in the literature. An increase in root temperature increased the maintenance part of root respiration and, to a lesser degree, also shoot maintenance respiration. Neither root nor shoot growth respiration coefficients were affected by root temperature. It is concluded that the study of whole‐plant respiration masks differences in energy utilization between shoots and roots.