Evaluation of traits stability for selection purposes in potato breeding programme
2015
Skrabule, I., State Priekuli Plant Breeding Inst., Priekuļi, Priekuļi parish, Priekuļi Municipality (Latvia) | Vaivode, A., Inst., Priekuļi, Priekuļi parish, Priekuļi Municipality (Latvia) | Piliksere, D., Inst., Priekuļi, Priekuļi parish, Priekuļi Municipality (Latvia) | Linina, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Murniece, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Food Technology | Kruma, Z., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Food Technology
One of the aims in potato breeding programmes is to develop varieties with high yield potential; essential for successful variety introduction into production additionally is yield stability in changing growing conditions. The trial for trait stability evaluation methods assessment was carried out in three farming systems (2 conventional fields with different fertilisation and organic field) for three years (2011-2013), in total nine environments. Five potato varieties were involved in trial (‘Agrie Dzeltenie’, ‘Lenora’, ‘Prelma’, ‘Brasla’ and ‘Imanta’). Yield, starch content in tubers, concentration of carotenoids, vitamins C and B1 in tubers (fresh weight) was detected for each variety in each environment. The data were analysed using analysis of variance (ANOVA) with two factors (variety and environment). The variety environmental variance (s**2) from ANOVA was one of traits stability assessment parameters – static. The regression approach (regression coefficient r**1) was also used for evaluation of traits stability. The ecovalnce (E) was used for stability evaluation in variety – environment interaction as dynamic concept (Becker and Leon, 1988). The s**2 and E were expressed in percentage of the total interaction sum of squares (Legzdina, 2013). The potato tuber yield was significantly determined by variety and environment (p is less than 0.05). The average yield of varieties ranged from 26.8-44.4 t haE-1. Yields of ‘Brasla’ and ‘Prelma’ exceeded mean yield level. Comparatively the parameter s**2 for ‘Prelma’ was lower, but E was higher than ‘Brasla’. Parameter b1 for both varieties was significant (p is less than 0.05) and did not differ significantly from 1, it means that both varieties were quite high yielding and acceptable for different growing environments.
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