Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec
Seasonal priorities for the use of current photosynthate were studied in the leaves of Betula glandulosa Michx. and Ledum groenlandicum Oeder from northern Quebec. A sequential extraction scheme was developed to separate ('14)C-labelled leaf tissues into several classes of organic compounds. Da...
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ftcanadathes:oai:collectionscanada.gc.ca:QMM.71966 2023-05-15T18:28:27+02:00 Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec Prudhomme, Thomas I. Doctor of Philosophy (Department of Biology.) 1985 application/pdf http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71966 en eng McGill University alephsysno: 000219676 proquestno: AAINL20826 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71966 All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. Betula glandulosa -- Analysis Ledum groenlandicum -- Analysis Plants -- Development Photosynthesis Electronic Thesis or Dissertation 1985 ftcanadathes 2014-02-16T18:46:09Z Seasonal priorities for the use of current photosynthate were studied in the leaves of Betula glandulosa Michx. and Ledum groenlandicum Oeder from northern Quebec. A sequential extraction scheme was developed to separate ('14)C-labelled leaf tissues into several classes of organic compounds. Data were analysed in terms of carbon use priority (CUP) defined as the ('14)C activity in a compound category as percentage of the total activity in the leaf. Developing leaves represented the strongest sink for current photosynthate among evergreen leaf age classes. In both species the priorities for structural components, leaf protection and metabolic components decreased while the importance of cellular lipids and storage carbohydrates increased with leaf age. The deciduous leaves had higher overall carbon use priorities for metabolic components, cellular lipids and storage carbohydrates. The priorities for structural components and leaf protection were higher in the evergreen leaves. Leaf protection was an important consideration in both species. Both B. glandulosa and L. groenlandicum leaves (1) allocated photosynthate to antiherbivore compounds when leaf succeptibility was highest, (2) used both quantitative and qualitative type defenses, and (3) reduced carbon use for quantitative type defenses during active growth. Thesis Subarctic Theses Canada/Thèses Canada (Library and Archives Canada) |
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Open Polar |
collection |
Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Betula glandulosa -- Analysis Ledum groenlandicum -- Analysis Plants -- Development Photosynthesis |
spellingShingle |
Betula glandulosa -- Analysis Ledum groenlandicum -- Analysis Plants -- Development Photosynthesis Prudhomme, Thomas I. Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
topic_facet |
Betula glandulosa -- Analysis Ledum groenlandicum -- Analysis Plants -- Development Photosynthesis |
description |
Seasonal priorities for the use of current photosynthate were studied in the leaves of Betula glandulosa Michx. and Ledum groenlandicum Oeder from northern Quebec. A sequential extraction scheme was developed to separate ('14)C-labelled leaf tissues into several classes of organic compounds. Data were analysed in terms of carbon use priority (CUP) defined as the ('14)C activity in a compound category as percentage of the total activity in the leaf. Developing leaves represented the strongest sink for current photosynthate among evergreen leaf age classes. In both species the priorities for structural components, leaf protection and metabolic components decreased while the importance of cellular lipids and storage carbohydrates increased with leaf age. The deciduous leaves had higher overall carbon use priorities for metabolic components, cellular lipids and storage carbohydrates. The priorities for structural components and leaf protection were higher in the evergreen leaves. Leaf protection was an important consideration in both species. Both B. glandulosa and L. groenlandicum leaves (1) allocated photosynthate to antiherbivore compounds when leaf succeptibility was highest, (2) used both quantitative and qualitative type defenses, and (3) reduced carbon use for quantitative type defenses during active growth. |
format |
Thesis |
author |
Prudhomme, Thomas I. |
author_facet |
Prudhomme, Thomas I. |
author_sort |
Prudhomme, Thomas I. |
title |
Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
title_short |
Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
title_full |
Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
title_fullStr |
Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
title_full_unstemmed |
Priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern Québec |
title_sort |
priorities determining the patterns of photosynthate use in leaves of a deciduous and an evergreen subarctic shrub from northern québec |
publisher |
McGill University |
publishDate |
1985 |
url |
http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71966 |
op_coverage |
Doctor of Philosophy (Department of Biology.) |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
alephsysno: 000219676 proquestno: AAINL20826 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71966 |
op_rights |
All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1766210947373858816 |