Functional anatomy of haustoria formed by Rhinanthus minor : linking evidence from histology and isotope tracing
The root parasite Rhinanthus minor feeds on the xylem of a diverse range of species. Grasses and legumes are the best hosts, while on forbs R. minor typically shows poorer growth. It has been hypothesized that host quality is linked to the expression of defences against the parasite seen in forb roo...
| Veröffentlicht in: | The New phytologist. - 1979. - 174(2007), 2 vom: 27., Seite 412-419 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
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2007
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Nitrates Nitrogen Isotopes Potassium Compounds potassium nitrate RU45X2JN0Z |
| Zusammenfassung: | The root parasite Rhinanthus minor feeds on the xylem of a diverse range of species. Grasses and legumes are the best hosts, while on forbs R. minor typically shows poorer growth. It has been hypothesized that host quality is linked to the expression of defences against the parasite seen in forb roots, but never in grasses. The efficacy of these defence mechanisms in preventing resource loss has not, however, been measured directly. Here we combine histological characterization of haustoria formed on Cynosurus cristatus (a grass), Leucanthemum vulgare and Plantago lanceolata (forbs) with (15)N tracers supplied to the host to quantify the efficacy of these defence responses. Rhinanthus minor penetrated only the xylem of C. cristatus, abstracting an average of 17% of the (15)N tracer taken up, but only 2.5 and 0.2%, respectively, when attached to L. vulgare and P. lanceolata. For the first time, this study has established that the resistance mechanisms of the forbs are effective in preventing the parasite from directly accessing their xylem solutes |
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| Beschreibung: | Date Completed 18.06.2007 Date Revised 14.04.2021 published: Print Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/j.1469-8137.2007.02013.x |