Nutritional regulation in mixotrophic plants: new insights from Limodorum abortivum.
Identifieur interne : 001870 ( Main/Corpus ); précédent : 001869; suivant : 001871Nutritional regulation in mixotrophic plants: new insights from Limodorum abortivum.
Auteurs : Alessandro Bellino ; Anna Alfani ; Marc-André Selosse ; Rossella Guerrieri ; Marco Borghetti ; Daniela BaldantoniSource :
- Oecologia [ 1432-1939 ] ; 2014.
English descriptors
- KwdEn :
- Biological Evolution (MeSH), Carbon Isotopes (metabolism), Mycorrhizae (physiology), Nutritional Physiological Phenomena (MeSH), Orchidaceae (metabolism), Orchidaceae (microbiology), Orchidaceae (physiology), Photosynthesis (physiology), Pigments, Biological (metabolism), Plant Structures (metabolism).
- MESH :
- chemical , metabolism : Carbon Isotopes, Pigments, Biological.
- metabolism : Orchidaceae, Plant Structures.
- microbiology : Orchidaceae.
- physiology : Mycorrhizae, Orchidaceae, Photosynthesis.
- Biological Evolution, Nutritional Physiological Phenomena.
Abstract
Partially mycoheterotrophic (mixotrophic) plants gain carbon from both photosynthesis and their mycorrhizal fungi. This is considered an ancestral state in the evolution of full mycoheterotrophy, but little is known about this nutrition, and especially about the physiological balance between photosynthesis and fungal C gain. To investigate possible compensation between photosynthesis and mycoheterotrophy in the Mediterranean mixotrophic orchid Limodorum abortivum, fungal colonization was experimentally reduced in situ by fungicide treatment. We measured photosynthetic pigments of leaves, stems, and ovaries, as well as the stable C isotope compositions (a proxy for photosynthetic C gain) of seeds and the sizes of ovaries and seeds. We demonstrate that (1) in natural conditions, photosynthetic pigments are most concentrated in ovaries; (2) pigments and photosynthetic C increase in ovaries when fungal C supply is impaired, buffering C limitations and allowing the same development of ovaries and seeds as in natural conditions; and (3) responses to light of pigment and (13)C contents in ovaries shift from null responses in natural conditions to responses typical of autotrophic plants in treated L. abortivum, demonstrating photoadaptation and enhanced use of light in the latter. L. abortivum thus preferentially feeds on fungi in natural conditions, but employs compensatory photosynthesis to buffer fungal C limitations and allow seed development.
DOI: 10.1007/s00442-014-2940-8
PubMed: 24817196
Links to Exploration step
pubmed:24817196Le document en format XML
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This is considered an ancestral state in the evolution of full mycoheterotrophy, but little is known about this nutrition, and especially about the physiological balance between photosynthesis and fungal C gain. To investigate possible compensation between photosynthesis and mycoheterotrophy in the Mediterranean mixotrophic orchid Limodorum abortivum, fungal colonization was experimentally reduced in situ by fungicide treatment. We measured photosynthetic pigments of leaves, stems, and ovaries, as well as the stable C isotope compositions (a proxy for photosynthetic C gain) of seeds and the sizes of ovaries and seeds. We demonstrate that (1) in natural conditions, photosynthetic pigments are most concentrated in ovaries; (2) pigments and photosynthetic C increase in ovaries when fungal C supply is impaired, buffering C limitations and allowing the same development of ovaries and seeds as in natural conditions; and (3) responses to light of pigment and (13)C contents in ovaries shift from null responses in natural conditions to responses typical of autotrophic plants in treated L. abortivum, demonstrating photoadaptation and enhanced use of light in the latter. L. abortivum thus preferentially feeds on fungi in natural conditions, but employs compensatory photosynthesis to buffer fungal C limitations and allow seed development. </div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Curated" Owner="NLM"><PMID Version="1">24817196</PMID><DateCompleted><Year>2014</Year><Month>11</Month><Day>18</Day></DateCompleted><DateRevised><Year>2018</Year><Month>12</Month><Day>02</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1432-1939</ISSN><JournalIssue CitedMedium="Internet"><Volume>175</Volume><Issue>3</Issue><PubDate><Year>2014</Year><Month>Jul</Month></PubDate></JournalIssue><Title>Oecologia</Title><ISOAbbreviation>Oecologia</ISOAbbreviation></Journal><ArticleTitle>Nutritional regulation in mixotrophic plants: new insights from Limodorum abortivum.</ArticleTitle><Pagination><MedlinePgn>875-85</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/s00442-014-2940-8</ELocationID><Abstract><AbstractText>Partially mycoheterotrophic (mixotrophic) plants gain carbon from both photosynthesis and their mycorrhizal fungi. This is considered an ancestral state in the evolution of full mycoheterotrophy, but little is known about this nutrition, and especially about the physiological balance between photosynthesis and fungal C gain. To investigate possible compensation between photosynthesis and mycoheterotrophy in the Mediterranean mixotrophic orchid Limodorum abortivum, fungal colonization was experimentally reduced in situ by fungicide treatment. We measured photosynthetic pigments of leaves, stems, and ovaries, as well as the stable C isotope compositions (a proxy for photosynthetic C gain) of seeds and the sizes of ovaries and seeds. We demonstrate that (1) in natural conditions, photosynthetic pigments are most concentrated in ovaries; (2) pigments and photosynthetic C increase in ovaries when fungal C supply is impaired, buffering C limitations and allowing the same development of ovaries and seeds as in natural conditions; and (3) responses to light of pigment and (13)C contents in ovaries shift from null responses in natural conditions to responses typical of autotrophic plants in treated L. abortivum, demonstrating photoadaptation and enhanced use of light in the latter. L. abortivum thus preferentially feeds on fungi in natural conditions, but employs compensatory photosynthesis to buffer fungal C limitations and allow seed development. </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Bellino</LastName><ForeName>Alessandro</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Dipartimento di Chimica e Biologia, Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, Salerno, Italy, alessandro_bellino@gmx.com.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Alfani</LastName><ForeName>Anna</ForeName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Selosse</LastName><ForeName>Marc-André</ForeName><Initials>MA</Initials></Author><Author ValidYN="Y"><LastName>Guerrieri</LastName><ForeName>Rossella</ForeName><Initials>R</Initials></Author><Author ValidYN="Y"><LastName>Borghetti</LastName><ForeName>Marco</ForeName><Initials>M</Initials></Author><Author 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