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Ecotypes of Italian ryegrass from Swiss permanent grassland outperform current recommended cultivars

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Abstract

Italian ryegrass (Lolium multiflorum Lam. ssp. italicum Volkart ex Schinz et Keller) thrives well in permanent grassland in mild and moist regions of Switzerland. Ecotypes of Italian ryegrass from Swiss permanent meadows have often been used successfully as the base material of breeding programmes. However, their agronomic performance per se has never been studied in detail. Therefore, field trials were conducted to assess the potential of this semi-natural genetic resource for use in breeding. Twenty ecotype populations were collected in different geographical regions in 2003 and seed was increased. Plot trials with 20 ecotype populations were conducted 2005–2007 at three locations, supplemented by row trials at two additional locations, and including four currently recommended cultivars as controls. Average performance in terms of yield, vigour and resistance to snow mould of ecotypes was superior to the cultivars. Depending on the characteristic, between three and 16 of the 20 ecotypes performed significantly better than the cultivars mean. However, resistance against crown rust of all ecotypes was significantly poorer than that of the cultivars. Correlation and regression analysis showed that more eastern and more northern collecting sites harboured better performing ecotypes. However, the most consistent site related factor favouring performance of the ecotypes in terms of yield, vigour, snow mould and Xanthomonas resistance was a low abundance of species which are typical of Arrhenatheretum type meadows. Data from the plot trials were related to results obtained with spaced plants at a single site, either in a seedling nursery or in the greenhouse. Resistance against crown rust was extremely well predicted by spaced plant observations. Xanthomonas resistance observed after artificial inoculation in the greenhouse was also significantly, but less closely correlated with field observations. An early date of ear emergence as observed on spaced plants was associated with high annual yield in the plot trials. It is concluded that in intensively managed habitats, natural selection has resulted in ecotype populations of Italian ryegrass which are highly promising for use in breeding. Individual plant selection for resistance can be expected to efficiently reduce their high susceptibility to crown rust.

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Acknowledgments

Madlaina Peter-Schmid and Eliane Tresch were partially funded through the programme “Diversity in Agriculture Campaign Plants (NAP)” by the Swiss Federal Office for Agriculture and in collaboration with AGFF, Arbeitsgemeinschaft zur Förderung des Futterbaus. We thank Peter Bigler, Daniel Schmid, Simone Günter and Philipp Streckeisen for technical assistance, and Serge Buholzer and Walter Dietl for advice with the classification of vegetation.

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  1. Agroscope Reckenholz-Tänikon, Research Station ART, Reckenholzstrasse 191, 8046, Zürich, Switzerland

    Beat Boller, Madlaina K. I. Peter-Schmid, Eliane Tresch, Peter Tanner & Franz Xaver Schubiger

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  1. Beat Boller
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  2. Madlaina K. I. Peter-Schmid
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  3. Eliane Tresch
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  4. Peter Tanner
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  5. Franz Xaver Schubiger
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Correspondence to Beat Boller.

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Boller, B., Peter-Schmid, M.K.I., Tresch, E. et al. Ecotypes of Italian ryegrass from Swiss permanent grassland outperform current recommended cultivars. Euphytica 170, 53–65 (2009). https://doi.org/10.1007/s10681-009-9963-y

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