The relation between root respiration and absorption

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dc.contributor.advisorGoldsmith, Glenn W. (Glenn Warren), 1886-
dc.creatorHenderson, Leta Mae
dc.date.accessioned2023-06-19T18:22:04Z
dc.date.available2023-06-19T18:22:04Z
dc.date.issued1932
dc.description1. A method was devised for growing corn seedlings under sterile conditions to secure active, uniform, and normal growth in liquid culture in the laboratory. 2. A method was developed for obtaining the simultaneous measurements of root respiration and water absorption. 3. The carbon dioxide evolution of roots is measured by the change in the pH of the medium. This is practicable only in the absence of buffering salts, and hence with the root system in distilled water. 4. The oxygen absorption of the roots was measured by the micro-Winkler method. 5. In aerated rain water the rates of absorption and carbon dioxide evolution show a positive correlation. 6. The absolutes values for carbon dioxide evolution obtained in rain water are low because of the buffer action of traces of salts present. 7. In aerated distilled water, a positive correlation between the rates of carbon dioxide evolution and water absorption is shown. 8. The absolute values obtained in distilled water are higher than those in rain water. 9. The rates in distilled water more nearly express the true respiratory activity of the roots than do those in rain water. 10. Absorption of oxygen in distilled water correlates closely with water absorption. 11. The respiratory quotient Is less than 1, varying between 0.61 and 0.91. 12. The higher values of the respiratory quotient correspond with low rates of water absorption, indicating the transportation of carbon dioxide from the root. 13. The rates of absorption of water and of oxygen by the roots in Knop's solution show a positive correlation. 14. The rate of oxygen absorption in Knop's solution is greater than that in distilled water. 15. The absorption of water by corn roots is accompanied by a liberation of energy which has been computed from the respiratory exchange. 16. In the absorption of one cubic centimeter of distilled water 11.61 calories of energy were liberated. 17. Absorption in Knop's solution is accompanied by the liberation of 110 per cent more energy than in distilled water. 18. The greatest efficiency in absorption appears at the highest absorptive rates. 19. Absorptive activities of roots involve the expenditure of energy
dc.description.departmentPlant Biologyen_US
dc.format.mediumelectronicen_US
dc.identifier.urihttps://hdl.handle.net/2152/119303
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/46181
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionOpenen_US
dc.subjectPlant respirationen_US
dc.subjectRoot respirationen_US
dc.subjectPlant absorption of wateren_US
dc.subjectRoot absorption of wateren_US
dc.subjectPlant energy expenditureen_US
dc.subjectRoot energy expenditureen_US
dc.subject.lcshPlants--Respiration
dc.subject.lcshPlants--Absorption of water
dc.subject.lcshRoots (Botany)--Physiology
dc.titleThe relation between root respiration and absorptionen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentPlant Biologyen_US
thesis.degree.disciplinePlant Biologyen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US

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