Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest
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| Language: | English |
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Bowling Green State University / OhioLINK
1976
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566302070897544 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-bgsu15663020708975442021-08-03T07:12:35Z Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest Floyd, Bradley William Biology Effects of sunfleck illumination, and other environmental and micro-climatological parameters, on photosynthetic activity were investigated in plant species at three levels in a deciduous forest, Wood County, Ohio. In addition, intraseasonal variation in chlorophyll content, a/b ratios, and chloroplast ultrastructure were investigated in selected individuals of the same species. Infrared color film was evaluated as a means of determining qualitative spectral information within forest canopies. By interpreting infrared images, it was found that plants exposed directly to sunfleck illumination reflect in the green spectral region, while those partially illuminated (as in the edge of a sunfleck) reflect weakly in the infrared. Those plants found in shaded areas appear to reflect strongly in the infrared. Carbon dioxide assimilation rates of sunfleck illuminated forest species were studied by monitoring carbon dioxide concentration via infrared gas analysis. Vegetation beneath the forest canopy receive more energy in the blue and red spectral regions from sunfleck than from shade illumination. Photosynthetic activity during sunfleck illumination of plant species in the canopy (shade leaves), sub-canopy, and herbaceous levels, may help these species subsist after canopy closure. Chlorophyll a/b ratios of all species sampled, except Prunus virginiana and Cornus florida, reached a peak at the time of canopy closure, while chlorophyll content reached a peak one to three weeks later. The number of thylakoid membranes per granum attained a maximum shortly after canopy closure, and the presence of starch grains in general, remained unchanged during the growing season. Thus it was presumed that the increase in chlorophyll content and thylakoid number was associated with variations in light intensity, with little or no reduction in photosynthetic activity. Bodies which appeared in the chloroplast stroma during the period after closure and persisted for six weeks, were thought to be by-products of leaf senescence. 1976 English text Bowling Green State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566302070897544 http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566302070897544 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
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NDLTD |
| topic |
Biology |
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Biology Floyd, Bradley William Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| author |
Floyd, Bradley William |
| author_facet |
Floyd, Bradley William |
| author_sort |
Floyd, Bradley William |
| title |
Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| title_short |
Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| title_full |
Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| title_fullStr |
Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| title_full_unstemmed |
Intraseasonal Variation in Photosynthetic Activity, Chlorophyll Content, and Chloroplast Ultrastructure of Sunfleck Illuminated Plant Species in a Deciduous Forest |
| title_sort |
intraseasonal variation in photosynthetic activity, chlorophyll content, and chloroplast ultrastructure of sunfleck illuminated plant species in a deciduous forest |
| publisher |
Bowling Green State University / OhioLINK |
| publishDate |
1976 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1566302070897544 |
| work_keys_str_mv |
AT floydbradleywilliam intraseasonalvariationinphotosyntheticactivitychlorophyllcontentandchloroplastultrastructureofsunfleckilluminatedplantspeciesinadeciduousforest |
| _version_ |
1719456080613867520 |