Abstract
This study assessed variability, heritability and correlations of agronomic traits in an onion (Allium cepa L.) landrace and derived S1lines after a single selfing generation. Bulbs used to develop S1lines were selected for shape, colour and high number of skins. Fifty-one S1lines and the original population were evaluated using an incomplete random block design. The original population and S1lines were highly diverse for quantitative and qualitative traits. S1lines were significantly different, with transgressive segregation for number and maximum leaf length, bulbing index, bulb weight, diameter, and dry matter content. Variances within S1lines were greater than among S1lines for all traits. Bulb colour and number of skins responded to selection. Heritabilities for dry matter and soluble solids were 52.6% and 36.1% respectively. Both traits were highly correlated. The development of S1lines allowed the expression of genetic variation and the identification of better genotypes for agronomic traits of interest.
Highlights
This study assessed variability, heritability and correlations of agronomic traits in an onion (Allium cepa L.) landrace and derived S1 lines after a single selfing generation
The aim of this study is to determine the variability of a set of agronomically relevant traits in an onion landrace, and the variability within and among S1 lines obtained after a single selfing generation
The mean values of the landrace UR9719 were significantly greater than the mean values of the 51 S1 lines for all quantitative traits, except for dry matter and soluble solidscontents (Table 1)
Summary
This study assessed variability, heritability and correlations of agronomic traits in an onion (Allium cepa L.) landrace and derived S1 lines after a single selfing generation. Onion landraces with high genetic diversity have potential in selection for development of cultivars with favourable agronomic and market traits, such as high number of skins and dark brown colours of skins, round shaped bulbs, and high soluble solids and dry matter content. For Uruguayan onion landraces, there is no study on the heritability of agronomic traits such as soluble solids, dry matter, and bulb weight and diameter. Heritability was determined using parent-offspring regression, and the correlations were estimated These results gave indications of diversity within the landrace UR9719 and the fitness of the S1 line method for breeding
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