Genotypic variation for root architecture traits in seedlings of maize (Zea mays L.) inbred lines

With 2 figures and 8 tables Abstract The aim of this study was to examine the extent of genotypic variability for root traits in a diverse set of maize inbred lines. Root traits were measured in maize lines grown up to 6, 10 and 14 days in the growth chamber on a germination paper. Combined analysis of variance revealed intermediate to high heritability values (range = 0.60.9) for all measured traits, indicating consistency across experiments. Euclidian distance value ranged from 1.8 to 19.6, indicating high levels of variability among the studied lines. First three principle components explained more than 80% of total genetic variation with high loadings from primary root parameters, seminal root parameters, total root length and root dry weight (DW). Root DW was significantly correlated with other root traits, indicating that direct selection based on root DW might be sufficient to improve other root traits. Some outstanding genotypes (PHT77, GEMN-0193, PHG35) with high relative growth rate at different time points were identified. These lines could be of potential use for the improvement of nutrient and water-use efficiency in maize.