The analysis of variability and of the relationships between useful traits in oats (Avena sativa L.)
Tadeusz Śmiałowski
zhsmialo@cyf-kr.edu.plZakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin, Kraków (Poland)
Stanisław Węgrzyn
Zakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin, Kraków (Poland)
Abstract
The aim of the study was to estimate variability, a level of genetic variability and phenotypic and genotypic correlation between important agricultural traits in cultivars and strains of oats investigated in the series of preliminary trials carried out in the years 2002–2004. The experiments were performed in 6 plant breeding stations. The following seven traits were evaluated: grain yield, height of plants, date of heading, resistance to lodging, resistance to crown rust, 1000 grains weight and a content of hull. The yield of the oat ranged from 55.8 dt/ha in 2003 to 77.8 dt/ha in 2004. In 2003, the grain yield was strongly affected by unfavourable weather conditions which caused lodging of plants and lowered the values of the other traits. The values of coefficients (h2) for genetic effects upon oat showed the decreasing tendency in the years 2002, 2003 and 2004 (0.789, 0.621 and 0.472, respectively). The height of plants and the resistance to lodging also appeared unstable in respect of genetic variability. The h2 coefficients characterizing the heading, hull content and resistance to crown rust were high (> 0.8) and stable. High variability characterized two traits: resistance to crown rust (CV = 57.3% in 2002, and 16.1% in 2004) and the resistance to lodging (CV = 10.9% in 2002, 13.7% in 2003, and 19.8% in 2004). Low variability was recorded for the yield of grain. The coefficient of variability for the weight of 1000 grains was stable throughout the study years. Desirable phenotypic and genotypic correlation between the grain yield and the resistance to crown rust was recorded in 2002 (rP = 0.41*, rG = 0.49*) and in 2004 (rP = 0.47*, rG = 0.76**). Undesirable correlation between the yield of grain and the resistance to lodging (rP= -0.42*, rG = -0.56**) and between the grain yield and the heading (rP = 0.51**, rG = 0.56**) was only found in 2002.
Keywords:
oat, phenotypic correlation genotypic correlation, useful traitsReferences
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Authors
Tadeusz Śmiałowskizhsmialo@cyf-kr.edu.pl
Zakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin, Kraków Poland
Authors
Stanisław WęgrzynZakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin, Kraków Poland
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