engleski

Quantitative genetic analysis for secondary traits related to abiotic and biotic stress in maize

Adverse effects of various abiotic and biotic stresses are known to be enhanced by high planting density in maize. We made quantitative genetic analysis for ear height (EH), plant height (PH), anthesis - silking interval (ASI), two chlorophyll fluorescence parameters (Fv/Fm and PI) and Fusarium ear rot percentage (%Fus) used as secondary stress-related traits measured along with grain yield in a maize population in two plant densities. 212 testcrosses of IBM (Intermated B73 x Mo17) population with an Iodent inbred line and four checks were grown in two planting densities – moderate (55.000 plants/ha) and high (89.000 plants/ha) and were set as incomplete rectangular lattice in two replications. EH differed significantly between the densities (121.7 cm in moderate and 129.4 cm in high) with heritability (h2) of 66.1 %. PH showed no significant differences between the densities (300.7 and 301.1 cm grown in two respective densities) with h2 being 86.16 %. ASI differed significantly between the densities (2.6 days in moderate and 3.7 days in high) with h2 value of 55.9 %. %Fus was significantly higher in high (6.8 %) compared to moderate planting density (4.4 %) with h2 of 60.6 %. Fv/Fm and PI did not differ significantly having very small genetic variance component. Grain yield was significantly higher in high (13.5 t/ha) compared to moderate planting density (12.2 t/ha) with h2 of 65.7 %. Two-year data will be presented and discussed in order to recommend which secondary traits seem to be relevant for plant density evaluation in maize breeding.

maize ; plant density ; IBM population ; stress related traits ; quantitative genetic analysis

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