Breeding red clover for improved persistence in Chile: a review
Fernando Ortega A C , Leonardo Parra B and Andrés Quiroz B
+ Author Affiliations
- Author Affiliations
A Instituto de Investigaciones Agropecuarias, INIA Carillanca, km 10 camino Cajón-Vilcún s/n, Región de La Araucanía, Chile.
B Universidad de La Frontera, Laboratorio de Química Ecológica, Departamento de Ciencias Químicas y Recursos Naturales, Temuco, Chile.
C Corresponding author. Email: fortega@inia.cl
Crop and Pasture Science 65(11) 1138-1146 https://doi.org/10.1071/CP13323
Submitted: 13 September 2013 Accepted: 6 February 2014 Published: 19 March 2014
Abstract
The main limitation of red clover (Trifolium pratense L.) worldwide including in Chile is the lack of persistence related to the high mortality of plants due to a complex of biotic and abiotic factors. We have demonstrated in various trials in Chile that red clover plant population is highly correlated with forage yield once the plant population has dropped to a certain level, from the second or third season onward, depending on the environment of evaluation. We have also found that in the south of Chile, among the biotic and abiotic factors affecting red clover survival, the curculionid Hylastinus obscurus (Marsham) is the main deleterious factor. However, because persistence is a complex trait, we have used a practical approach in our breeding program. We selected for general adaptability under field conditions and used a modified among and within half-family selection methodology, evaluating at the same time families as swards and spaced plants. This breeding methodology and strategy have yielded reasonable genetic gains since we started our breeding program in 1989 at INIA Carillanca, Chile. Since then, we have conducted five cycles of recurrent selection, and two cultivars have been released to replace the old cultivar, Quiñequeli INIA. These are Redqueli INIA and, more recently, Superqueli INIA. Depending on location and trial, average forage yield of the newest cultivar Superqueli INIA has been 23–69% higher than Quiñequeli INIA and 5–36% higher than Redqueli INIA; this difference increases in the third and fourth seasons. Superqueli INIA had four times the yield of Quiñequeli INIA in the fourth season. Therefore, the average realised genetic gain has been 0.4–2.6% per year, depending on location, showing the effectiveness of the breeding methodology and approach used.
Additional keywords: abiotic stress, breeding strategies, genetic improvement, plant breeding, plant–insect interactions, selection programs.
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