The aim of this study was to evaluate the agronomic potential of 24 carrot hybrids, nine being obtained by crossings between lines of tropical origin (Brasília group: CNPH-520 and CNPH-536) and temperate origin (male-sterile: CNPH-610, CNPH-664, CNPH-633, CNPH-712 and CNPH-671) and 15 lines obtained from crossings between tropical origin lines (CNPH-1 to CNPH-15) and the male-sterile line CNPH-612. Between 2011 and 2012 two experiments were carried out in randomized complete block design with three replications. The experimental plots consisted of three double rows spaced 20 cm apart, with 10 cm between rows. The leaf blight occurred naturally in the field and was assessed 90 days after sowing. The agronomic yields were evaluated 100 days after sowing. In the first experiment, the hybrids CNPH-610×CNPH-536, CNPH-712×CNPH-536 and CNPH-610×CNPH-520 presented lower disease severity while CNPH-610×CNPH-520 and the hybrids CNPH-664×CNPH-520 and CNPH-671×CNPH-520 showed the highest yields of marketable roots and lower production of refused roots. Hybrids did not differ in average weight and length of roots. In the second experiment, the hybrids CNPH-612×CNPH-2, CNPH-612×CNPH-6, CNPH-612×CNPH-10 and CNPH-612×CNPH-11 presented better results for all traits (resistance to leaf blight, marketable root production and refuse, weight, length and diameter of roots), followed by CNPH-612×CNPH-3, which presented lower average length of roots.
Daucus carota; lines; leaf blight; genetic divergence.
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