Evaluation of combining ability of maize lines on the basis of cross potential index
Henryk Bujak
henryk.bujak@upwr.edu.plKatedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Katarzyna Dmochowska-Huba
Katedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Stanisław Jedyński
Katedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Jan Kaczmarek
Katedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Abstract
The material used in the study consisted of 80 F1 hybrids obtained by crossing 20 flint lines with 2 dent testers and 20 dent lines with 2 flint testers. Field trials were conducted at the breeding stations at Kobierzyce and Smolice. Incomplete block design was used. The following characters were analysed statistically: pollen shed, silking, ear length, no. of rows/ear, no. of kernels/row, no. of kernels/ear, ear weight, cob weight, % dry matter and weight of grain/ear. In order to evaluate simultaneously 10 characters of lines and hybrids, two indices of genetic crossing potential (Yi, Yij) were computed. Positive relationship was found between the indices, which gave similar rankings of the lines. High correlations were observed between no. of kernels/ear, no. of rows/ear, ear weight and Yi index. The SCA index (Yij) indicated the following pairs of lines: K 324 × K 194, S 4-4s × S 50668-4, S 43047 × S 50668-4 and S 56028A × S 50668-4 as potentially most heterotic. It was concluded from the studies that multidimensional genetic indices of crossing potential can be useful in selection in respect of general and specific combining ability.
Supporting Agencies
Keywords:
combining ability, genetic crossing potential, hybrid, inbred line, maize, selection indexReferences
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Authors
Henryk Bujakhenryk.bujak@upwr.edu.pl
Katedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Katarzyna Dmochowska-HubaKatedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Stanisław JedyńskiKatedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Jan KaczmarekKatedra Hodowli Roślin i Nasiennictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
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Copyright (c) 2007 Henryk Bujak, Katarzyna Dmochowska-Huba, Stanisław Jedyński, Jan Kaczmarek
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