Davey, Christopher Lyndon;
Jones, Laurence Edmund;
Squance, Michael;
Purdy, Sarah Jane;
Maddison, Anne Louise;
Cunniff, Jennifer;
Donnison, Iain;
Clifton‐Brown, John
Radiation capture and conversion efficiencies of Miscanthus sacchariflorus, M. sinensis and their naturally occurring hybrid M. × giganteus
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Medientyp:
E-Artikel
Titel:
Radiation capture and conversion efficiencies of Miscanthus sacchariflorus, M. sinensis and their naturally occurring hybrid M. × giganteus
Beteiligte:
Davey, Christopher Lyndon;
Jones, Laurence Edmund;
Squance, Michael;
Purdy, Sarah Jane;
Maddison, Anne Louise;
Cunniff, Jennifer;
Donnison, Iain;
Clifton‐Brown, John
Erschienen:
Wiley, 2017
Erschienen in:GCB Bioenergy
Sprache:
Englisch
DOI:
10.1111/gcbb.12331
ISSN:
1757-1707;
1757-1693
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p><jats:italic>Miscanthus</jats:italic> is a rhizomatous C4 grass of great interest as a biofuel crop because it has the potential to produce high yields over a wide geographical area with low agricultural inputs on marginal land less suitable for food production. At the moment, a clonal interspecific hybrid <jats:italic>Miscanthus</jats:italic> × <jats:italic>giganteus</jats:italic> is the most widely cultivated and studied in Europe and the United States, but breeding programmes are developing newer more productive varieties. Here, we quantified the physiological processes relating to whole season yield in a replicated plot trial in Wales, <jats:styled-content style="fixed-case">UK</jats:styled-content>. Light capture and conversion efficiency were parameterized for four carefully selected genotypes (<jats:italic>M. sinensis</jats:italic>,<jats:italic> M. sacchariflorus</jats:italic> and <jats:italic>Miscanthus</jats:italic> × <jats:italic>giganteus</jats:italic>). Differences in the canopy architecture in mature stands as measured by the extinction coefficient (<jats:italic>k</jats:italic>) were small (0.55–0.65). Sensitivity analysis on a mathematical model of <jats:italic>Miscanthus</jats:italic> was performed to quantify the accumulative intercepted photosynthetically active radiation (<jats:styled-content style="fixed-case">iPAR</jats:styled-content>) in the growing season using (i) k, (ii) variation in the thermal responses of leaf expansion rate, (iii) base temperature for degree days and (iv) date start of canopy expansion. A 10% increase in <jats:italic>k</jats:italic> or leaf area per degree day both had a minimal effect on <jats:styled-content style="fixed-case">iPAR</jats:styled-content> (3%). Decreasing base temperature from 10 to 9 °C gave an 8% increase in <jats:styled-content style="fixed-case">iPAR</jats:styled-content>. If the starting date for canopy expansion was the same as shoot emergence date, then the <jats:styled-content style="fixed-case">iPAR</jats:styled-content> increases by 12.5%. In <jats:italic>M</jats:italic>. × <jats:italic>giganteus,</jats:italic> the whole season above ground and total (including below ground) radiation‐use efficiency (<jats:styled-content style="fixed-case">RUE</jats:styled-content>) ranged from 45% to 37% higher than the noninterspecific hybrid genotypes. The greater yields in the interspecific hybrid <jats:italic>M. × giganteus</jats:italic> are explained by the higher <jats:styled-content style="fixed-case">RUE</jats:styled-content> and not by differences in <jats:styled-content style="fixed-case">iPAR</jats:styled-content> or partitioning effects. Studying the mechanisms underlying this complex trait could have wide benefits for both fuel and food production.</jats:p>