Variability of morphological and yield-contributing traits of grasspea (Lathyrus sativus L.) mutants
Wojciech Rybiński
office@igr.poznan.plInstytut Genetyki Roślin PAN, Poznań (Poland)
Jan Bocianowski
Katedra Metod Matematycznych i Statystycznych, Uniwersytet Przyrodniczy w Poznaniu (Poland)
Katarzyna Pankiewicz
Instytut Genetyki Roślin PAN, Poznań (Poland)
Abstract
Apart from many advantageous features, such as high tolerance to abiotic stresses, grasspea is characterized by a few undesirable traits that limit its broader use in Polish agriculture. Genetic improvement of this crop with mutation breeding can be a valuable supplement to conventional plant breeding methods to create additional genetic variability that may be utilized by plant breeders. The present studies deal with grasspea mutants obtained from seeds of two Polish cultivars Derek and Krab treated with different doses of chemomutagens. Nineteen mutants derived from the cultivar Krab and nine mutants from the cultivar Derek were studied in a field trial conducted in 2004-2006 at the Experiment Station of Polish Academy of Sciences in Cerekwica. The variability of morphological and yield-contributing traits of the mutants and the initial cultivars were estimated for each year, and the results obtained were analyzed with multivariate statistics. The results indicate that the mutants’ traits differed from their initial cultivars. In 2005 and 2006 drought occurred, which might have influenced the results. Among the traits studied for three years the highest coefficient of variation was observed for time to flowering, plant height, pod number per plant, seed number per plant, seed weight per plant; the lowest for pod length and width and seed number per pod. The values of the contrasts for the comparisons of the cultivars with their mutants for particular traits were generally positive. This indicates that for three years studied together, the cultivars had higher values of the corresponding traits than their mutants. In spite of this negative trend, a few mutants exceeded their initial cultivars for yield-contributing traits, which was particularly visible in both dry years 2005 and 2006. Canonical variety analysis was a useful statistical tool for clear identification of multivariate genetic variation of grasspea mutants. The analyses performed allowed to distinguish these mutants that highly differed from their initial cultivars and the other mutants. Such mutants, particularly those with a broad reaction to water stress, could constitute an interesting initial material for further breeding.
Keywords:
field trials, genetic variation, grasspea, mutants, yield-contributing traitsReferences
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Authors
Jan BocianowskiKatedra Metod Matematycznych i Statystycznych, Uniwersytet Przyrodniczy w Poznaniu Poland
Authors
Katarzyna PankiewiczInstytut Genetyki Roślin PAN, Poznań Poland
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