Adaptation of the path-coefficient analysis to assess genotypic relationships and interrelationships of the yield parameters in winter rye (Secale cereale)
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 direct and indirect effects of six traits on grain yield per plot in strains and cultivars of winter rye, investigated in field trials in 1999 and 2000. The study was carried out on 112 forms (56 in each year) in 7 localities. The path-coefficient analysis carried the make the genotypic correlations between of investigated the traits. Grain yield was found to be influenced by the plant height, uniformity, date of heading, pollinating ability, resistance to lodging and brown rust. Path-coefficient analysis showed a very strong direct effect of pollination ability on grain yield, at P27(1999) = -1,701 and P27(2000) = -0,988. The above effects significantly affected genotypic correlation between grain yield and pollination ability in both years of study (rG(1999) = -0,43* and rG(2000) = -0,71**). A positive genotypic correlation was also found between plant uniformity and grain yield (rG(1999) = 0.23 and rG(2000) = 0.47*), although direct effects on yield were negative in both years of the study (P47(1999)= -0.885, and P47(2000)= -0.454). Multiple determination coefficients R2(1999) = 90.8% and R2(2000)=63,1% were high.
Keywords:
genotypic correlation, path-analysis, grain yield, winter ryeReferences
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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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