Effects of seed size and carbon dioxide enrichment on expansion and initiation rates of wild radish (Raphanus raphanistrum) leaves.

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dc.contributor.author Kim, David en_US
dc.coverage.spatial UMBS Greenhouse en_US
dc.date.accessioned 2007-06-14T22:10:38Z
dc.date.available 2007-06-14T22:10:38Z
dc.date.issued 1993 en_US
dc.identifier.uri http://hdl.handle.net/2027.42/54458
dc.description.abstract Rising atmospheric carbon dioxide concentrations could lead to selection for certain genotypes which are best able to respond to the changing conditions. For some plant species, early growth rates in seedlings is a good indicator of fitness. By attaining a large size early in life plants can reduce their susceptibility to water stress and shading by competitors. Two components of early growth rate that would minimize the possibility of shading by competitors are expansion and initiation rates of leaves. Past studies have shown that early growth rates can be increased when plants are grown from relatively large seeds or in an elevated CO2 environment. However, this study of early growth rates of the third, fourth, and fifth leaves of Raphanus raphanistrum, wild radish, detected no correlation between seed size and leaf expansion or initiation rates. 183 plants were grown in open-top field chambers, eighty-three at ambient CO2 (360 ppm) and one hundred at an elevated carbon dioxide concentration of approximately 700 ppm. The plants grown under elevated CO2 conditions showed a decrease in early growth. Fourth and fifth leaves grew significantly slower in elevated CO2 (P=0.0001 and 0.0002 respectively), and the initiation rate between the third and fourth leaves was also significantly slower (P=0.020). The two most likely reasons for this decrease in growth are that the leaves grew thicker instead of longer, and that higher proportions of assimilated carbon were invested into below ground growth in order to take up greater amounts of nutrients. en_US
dc.format.extent 911561 bytes
dc.format.extent 3144 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.subject Undergraduate Research Exper. en_US
dc.subject.other CARBON en_US
dc.subject.other DIOXIDE en_US
dc.subject.other ELEVATED en_US
dc.subject.other ATMOSPHERIC en_US
dc.subject.other GROWTH en_US
dc.subject.other BIOMASS en_US
dc.subject.other RAPHANUS en_US
dc.subject.other VASCULAR en_US
dc.subject.other PLANTS en_US
dc.subject.other SIZE en_US
dc.title Effects of seed size and carbon dioxide enrichment on expansion and initiation rates of wild radish (Raphanus raphanistrum) leaves. en_US
dc.type Working Paper en_US
dc.subject.hlbsecondlevel Natural Resource and Environment en_US
dc.subject.hlbtoplevel Science en_US
dc.contributor.affiliationum Biological Station, University of Michigan en_US
dc.contributor.affiliationumcampus Ann Arbor en_US
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/54458/1/2896.pdf en_US
dc.description.filedescription Description of 2896.pdf : Access restricted to on-site users at the U-M Biological Station. en_US
dc.owningcollname Biological Station, University of Michigan (UMBS)
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