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Comparison of doubled haploid lines and F 2 bulks for the improvement of barley in the dry areas of North Syria
Author(s) -
Mayer M.,
Gland A.,
Ceccarelli S.,
Geiger H. H.
Publication year - 1995
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1995.tb00757.x
Subject(s) - doubled haploidy , biology , predictability , limiting , selection (genetic algorithm) , ploidy , agronomy , drought stress , hordeum vulgare , poaceae , botany , horticulture , microbiology and biotechnology , statistics , gene , genetics , mathematics , mechanical engineering , artificial intelligence , computer science , engineering
Drought stress is the main factor limiting barley yields in West Asia and North Africa. This study compares the utility of doubled haploid lines (DHLs) and conventional F 2 plant‐derived bulks (F 2 Bs) in improving barley in stress environments. Double crosses were made, DHLs were developed by anther culture from double‐cross F 1 plants, and F 2 Bs were produced by bulking the offspring of F 2 plants. Field tests were conducted in three drought‐stressed environments. No major differences were observed in the mean performance of DHLs and F 2 Bs. For most traits, both the genotypic and the genotype × location interaction variances were higher in the DHL group, whereas heritabilities were similar. Higher gains from selection were predicted for the DHL group. Regression analysis of yield stability indicated a lower predictability of the DHL performance. The haploid technique can improve breeding populations from which varieties with stable yields can be developed. The costs involved are determined by the DHL production rate, which needs to be improved in many developing countries.