Autoradiograms of plants which had one of their leaves (presentation leaf) photosynthesizing in C14O2 show high concentration of radioactivity in the growing point and roots and low concentration in leaves below the presentation leaf. Infection on two of these lower leaves increases the concentration of radioactivity in them, especially around lesions, but has no marked and consistent effect on the concentration in other organs. Infection on the presentation leaf reduces photosynthesis and export of C14 to other parts. Heat girdling of petioles of healthy and infected leaves show that in both cases, C14 export takes place through phloem and its import through xylem. Radioactivity in detached leaves exposed to C14O2 , either in light or in darkness, is uniformly distributed in healthy leaves, but accumulates around lesions in diseased ones. Starch has similar distribution. Pathological increase in transpiration and metabolic activity are probably responsible for the altered cl4 distribution in diseased leaves.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.113631 |
| Date | January 1962 |
| Creators | Garraway, Michael. O. |
| Contributors | Pelletier, R. (Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science. (Department of Agriculture.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: NNNNNNNNN, Theses scanned by McGill Library. |
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