Selection of contrasting cold tolerant white clover genotypes from twenty-eight populations naturalized in Chile and two cultivars.

Acuña, Hernán; Inostroza F, Luis; Pino, María Teresa

Keywords: Cold tolerance, naturalized populations, Weibull distribution, plant survival

Abstract

A collection of 28 populations of naturalized white clover in Argentinean and Chilean Patagonia, and two white clover cultivars, was used to select two groups of contrasting cold tolerance genotypes: 96 cold-sensitive and 96 cold-tolerant. The objective was to form an association-mapping population. Sixty young plants of each population were cold stressed progressively at -2, -4, -6 and -8 ºC for 48 hours and the damaged plants recorded. The records were fitted to the Weibull distribution and the three most tolerant and the three most sensitive populations were selected using the LT50 value (Lethal Temperature for 50% of the population) to choose the contrasting genotypes. The white clover populations showed a broad genetic variability for cold tolerance, which allowed the selection of 192 genotypes with divergent coldtolerance and formation of the association-mapping populations. Keywords: Cold tolerance, naturalized populations, Weibull distribution, plant survival

Más información

Editorial: Organising Committee of the 25th General Meeting of the European Grassland Federation IBERS, Aberystwyth University, Gogerddan, SY23 3EE, UK
Fecha de publicación: 2014
Año de Inicio/Término: 7-11 September 2014
Página de inicio: 858
Página final: 860
Idioma: INGLÉS
URL: https://www.europeangrassland.org/fileadmin/documents/Infos/Printed_Matter/Proceedings/EGF2014.pdf
Notas: Acuña H., Inostroza L. and Pino M. (2014) Selection of contrasting cold tolerant white clover genotypes from twenty eight populations naturalized in southern Chile and Argentina. Proceedings of the 25th General Meeting of the European Grassland Federation Aberystwyth, Wales 7-11 September 2014 . Grassland Science in Europe 19, 858-860. https://www.europeangrassland.org/fileadmin/documents/Infos/Printed_Matter/Proceedings/EGF2014.pdf