Record ID No. |
2774 |
Author(s) |
Latalova K,. Balaz M. , 2010. |
Affiliation |
Faculty of Science, Masaryk University, Kotlarska 2, CZ-61137 Brno, Czech Republic. balaz@sci.muni.cz |
Title |
Carbon nutrition of mature green orchid Serapias strictiflora and its mycorrhizal fungus Epulorhiza sp. |
Source. Vol.(no):Page |
Biologia Plantarum. 54(1): 97-104p. |
Categories |
Orchid Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Host |
Serapias strictiflora |
Organism |
Orchid mycorrhiza(Epulorhiza sp.) |
Country |
Czech Republic, Europe |
Abstracts |
We studied the nutritional modes of the orchid Serapias strictiflora and its mycorrhizal fungus Epulorhiza sp. using the differences in carbon isotopic composition ( delta 13C) of C3 orchid and C4 maize tissues. We found that if cultivated in substrate lacking any organic compounds, the mycorrhizal extraradical mycelia ( delta 13C=-26.3+or-0.2 per mil) developed well, despite being fully dependent on nutrition from orchid roots ( delta 13C=-28.6+or-0.1 per mil). If the mycorrhizal fungus had additional access to and colonized decaying maize roots ( delta 13C=-14.6+or-0.1 per mil), its isotopic composition ( delta 13C=-21.6+or-0.4 per mil) reflected a mixture of biotrophy and saprotrophy. No statistically significant differences in delta 13C of new storage tubers were found between Epulorhiza-associated orchids with ( delta 13C=-28.2+or-0.1 per mil) and without access to maize roots ( delta 13C=-28.6+or-0.2 per mil). We conclude that autotrophy is the predominant nutritional mode of mature S. strictiflora plants and that they supply their mycorrhizal fungus with substantial amount of carbon (69+or-3% of the fungus demand), even if the fungus feeds saprotrophically. |