Adaptive characterization of maize hybrids (zea mays l.) Based on doubled haploid lines of lancaster plasma

Abstract

The aim and tasks of the study. The study of adaptive ability parameters in new corn hybrids created with the involvement of doubled haploid maize lines of Lancaster plasma.

Material and methods. Over the period of 2009-2011 in a control nursery, 99 hybrid combinations, which were generated with the involvement of 33 lines of Lancaster plasma (29 doubled haploid lines and 4 original inbred lines), were investigated. Sister hybrids - DK744 × DK274-3 (Iodent plasma), DK257M × DK742 and DK500 × DK307-5 (Iodent plasma, BSSS) were used as testers.

Results and discussion. The study identified 58.6% of combinations with positive effects of general adaptive capacity, and the hybrid (DK744 × DK274-3) × Dga 6016 (1.22 t / ha) was the best.

Differentiation of 99 hybrids by the regression coefficient showed that 60.6% of combinations had bi → 1, and the percentage of hybrids with bi> 1 and bi <1 was 20.2% and 19.2%, respectively.

To simultaneously select genotypes for high productivity and stability of its manifestations, the parameter of genotype breeding value (GBV) is used. For example, in 52 tests crosses this index exceeded the average of an experiment. Hybrids (DK500 × DK307-5) × Dga 6023 (6.15), (DK500 × DK307-5) × Dga 6014 (6.10), (DK257M × DK742) × Dga 6011 (5.78), (DK500 × DK307-5) × Dga 6013 (5.56), and (DK500 × DK307-5) × Dga 6001 (5.70) had the maximum GBVs.

Conclusions. Thus, the results of comprehensive assessment of the adaptability and stability parameters of maize hybrids identified combinations with the highest yield stability - (DK500 × DK307-5) × Dga 6014 (bi <1) and (DK744 × DK274-3) × Dga 6016 (bi → 1).