Measuring Heterotroph-Induced Source-Sink Relationships in Panicum Coloratum with ^1^1C Technology.
Identifieur interne : 003B31 ( Main/Exploration ); précédent : 003B30; suivant : 003B32Measuring Heterotroph-Induced Source-Sink Relationships in Panicum Coloratum with ^1^1C Technology.
Auteurs : M I Dyer ; D C Coleman ; D W Freckman ; S J McnaughtonSource :
- Ecological applications : a publication of the Ecological Society of America [ 1051-0761 ] ; 1993.
Abstract
We report a synthesis from three series of experiments on source-sink relationships in Panicum coloratum L., a C"4 tropical grass obtained from the Serengeti grasslands of Africa. Studies on ^1^1C real-time analyses of P. coloratum to determine aboveground effects of grasshopper grazing and belowground effects of mycorrhizal inoculation and nematode feeding provided the database. A series of multi- and univariate statistical investigations of all available experimental data described responses of leaves, stems, and roots to these biological stresses. From a principal components analysis we have shown differences in distribution of C source-sink locations along three principal component axes, which accounted for 84% of the experimental variance. The first and second components (62% of variance) described C allocation to leaf, stem, and root sinks. The third component (22% of variance) showed a metabolic dichotomy between leaf starch sinks and labile carbon pools throughout the plant. We use the three principal components from a ^1^1C three-compartment model describing leaf, stem, and root C source and sink variables to present patterns, or fingerprints, of responses to the experiments. Time of day, treatment class, number of days since transplanting, and ecotype controlled a large amount of the overall variation in plant C fixation and reallocation. A comparison of ^1^2C leaf carbon exchange rates (CER) measured with an infrared gas analyzer and ^1^1C rates showed a high positive correlation. Slopes for grasshopper grazing, mycorrhizal inoculation experiments, and nematode feeding showed almost identical results; however, differences in the intercept developed as a function of ecotype. We noted a significantly lower intercept in morning studies, but no differences in the slope for morning compared to afternoon studies. CER and all ^1^1C variables for grasshopper and nematode experiments showed a lower coefficient of ^1^1C variables and higher for CER. We conclude that ^1^1C experiments provide the base for developing laboratory, field, modeling studies to incorporate aggregations of real-time C transfers within plants responding to biological stresses, including those of heterotrophs.
DOI: 10.2307/1942098
PubMed: 27759293
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Studies on ^1^1C real-time analyses of P. coloratum to determine aboveground effects of grasshopper grazing and belowground effects of mycorrhizal inoculation and nematode feeding provided the database. A series of multi- and univariate statistical investigations of all available experimental data described responses of leaves, stems, and roots to these biological stresses. From a principal components analysis we have shown differences in distribution of C source-sink locations along three principal component axes, which accounted for 84% of the experimental variance. The first and second components (62% of variance) described C allocation to leaf, stem, and root sinks. The third component (22% of variance) showed a metabolic dichotomy between leaf starch sinks and labile carbon pools throughout the plant. We use the three principal components from a ^1^1C three-compartment model describing leaf, stem, and root C source and sink variables to present patterns, or fingerprints, of responses to the experiments. Time of day, treatment class, number of days since transplanting, and ecotype controlled a large amount of the overall variation in plant C fixation and reallocation. A comparison of ^1^2C leaf carbon exchange rates (CER) measured with an infrared gas analyzer and ^1^1C rates showed a high positive correlation. Slopes for grasshopper grazing, mycorrhizal inoculation experiments, and nematode feeding showed almost identical results; however, differences in the intercept developed as a function of ecotype. We noted a significantly lower intercept in morning studies, but no differences in the slope for morning compared to afternoon studies. CER and all ^1^1C variables for grasshopper and nematode experiments showed a lower coefficient of ^1^1C variables and higher for CER. We conclude that ^1^1C experiments provide the base for developing laboratory, field, modeling studies to incorporate aggregations of real-time C transfers within plants responding to biological stresses, including those of heterotrophs.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">27759293</PMID><DateRevised><Year>2019</Year><Month>11</Month><Day>20</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">1051-0761</ISSN><JournalIssue CitedMedium="Print"><Volume>3</Volume><Issue>4</Issue><PubDate><Year>1993</Year><Month>Nov</Month></PubDate></JournalIssue><Title>Ecological applications : a publication of the Ecological Society of America</Title><ISOAbbreviation>Ecol Appl</ISOAbbreviation></Journal><ArticleTitle>Measuring Heterotroph-Induced Source-Sink Relationships in Panicum Coloratum with ^1^1C Technology.</ArticleTitle><Pagination><MedlinePgn>654-665</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.2307/1942098</ELocationID><Abstract><AbstractText>We report a synthesis from three series of experiments on source-sink relationships in Panicum coloratum L., a C"4 tropical grass obtained from the Serengeti grasslands of Africa. Studies on ^1^1C real-time analyses of P. coloratum to determine aboveground effects of grasshopper grazing and belowground effects of mycorrhizal inoculation and nematode feeding provided the database. A series of multi- and univariate statistical investigations of all available experimental data described responses of leaves, stems, and roots to these biological stresses. From a principal components analysis we have shown differences in distribution of C source-sink locations along three principal component axes, which accounted for 84% of the experimental variance. The first and second components (62% of variance) described C allocation to leaf, stem, and root sinks. The third component (22% of variance) showed a metabolic dichotomy between leaf starch sinks and labile carbon pools throughout the plant. We use the three principal components from a ^1^1C three-compartment model describing leaf, stem, and root C source and sink variables to present patterns, or fingerprints, of responses to the experiments. Time of day, treatment class, number of days since transplanting, and ecotype controlled a large amount of the overall variation in plant C fixation and reallocation. A comparison of ^1^2C leaf carbon exchange rates (CER) measured with an infrared gas analyzer and ^1^1C rates showed a high positive correlation. Slopes for grasshopper grazing, mycorrhizal inoculation experiments, and nematode feeding showed almost identical results; however, differences in the intercept developed as a function of ecotype. We noted a significantly lower intercept in morning studies, but no differences in the slope for morning compared to afternoon studies. CER and all ^1^1C variables for grasshopper and nematode experiments showed a lower coefficient of ^1^1C variables and higher for CER. We conclude that ^1^1C experiments provide the base for developing laboratory, field, modeling studies to incorporate aggregations of real-time C transfers within plants responding to biological stresses, including those of heterotrophs.</AbstractText><CopyrightInformation>© 1993 by the Ecological Society of America.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Dyer</LastName><ForeName>M I</ForeName><Initials>MI</Initials></Author><Author ValidYN="Y"><LastName>Coleman</LastName><ForeName>D C</ForeName><Initials>DC</Initials></Author><Author ValidYN="Y"><LastName>Freckman</LastName><ForeName>D W</ForeName><Initials>DW</Initials></Author><Author ValidYN="Y"><LastName>McNaughton</LastName><ForeName>S J</ForeName><Initials>SJ</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Ecol Appl</MedlineTA><NlmUniqueID>9889808</NlmUniqueID><ISSNLinking>1051-0761</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Panicum coloratum L.</Keyword><Keyword MajorTopicYN="N">^1^1C technology</Keyword><Keyword MajorTopicYN="N">grasshopper grazing</Keyword><Keyword MajorTopicYN="N">multivariate analyses</Keyword><Keyword MajorTopicYN="N">mycorrhizae</Keyword><Keyword MajorTopicYN="N">phytophagous nematodes</Keyword><Keyword MajorTopicYN="N">source--sink carbon movements</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1993</Year><Month>11</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1993</Year><Month>11</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1993</Year><Month>11</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">27759293</ArticleId><ArticleId IdType="doi">10.2307/1942098</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list></list><tree><noCountry><name sortKey="Coleman, D C" sort="Coleman, D C" uniqKey="Coleman D" first="D C" last="Coleman">D C Coleman</name><name sortKey="Dyer, M I" sort="Dyer, M I" uniqKey="Dyer M" first="M I" last="Dyer">M I Dyer</name><name sortKey="Freckman, D W" sort="Freckman, D W" uniqKey="Freckman D" first="D W" last="Freckman">D W Freckman</name><name sortKey="Mcnaughton, S J" sort="Mcnaughton, S J" uniqKey="Mcnaughton S" first="S J" last="Mcnaughton">S J Mcnaughton</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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