Abstract
Carrots are among the most planted vegetables in Brazil, which represents importance in the national market. This crop can be grown in conventional and agroecological systems, and studies to improve productivity, disease resistance and root quality in agroecological cropping systems are important. The aim of the present work was to estimate genetic parameters that provide a breeding strategy in the search for the development of new varieties of carrot adapted to the conditions of Distrito Federal’s agroecology cultivation. Considering data from tests performed in areas of agroecology cultivation (Natural Agriculture-NA and Organic Agriculture-OA), the following characteristics were evaluated: incidence of leaf blight-LB, incidence of root cracking-CRACK, root length-COMP, format of root tip-TP, format of root shoulder-TO, measure of the color of the a* xylem parameter-a*X, measure of the color of the a* phloem parameter-a*F. Traits were evaluated in 100 half-sib progenies derived from Brasília cultivar, using a completely randomized block design. For the characters COMP, a*X, a*F, TP and TO, the treatment X environment interaction was significant according to the results from test F. The values of the individual variance analyses presented significant effect for the following characteristics: COMP, a*X, TP, TO, LB for NA system, and COMP, a*X, a*F, TP for OA system. In NA system, the values of heritability estimates-ha² for the plant characters fluctuated from 65.66 to 25.52% and, in the OA system, the ha² of the characters a*X, was 81.13%. Estimates of genetic gain per cycle for the characters a*X and a*F were lower in NA system than the estimates observed in OA system.
Highlights
The carrot (Daucus carota L.) is among the five most important vegetable crops in Brazil, considering the crop area or value of production (MAROUELLI; OLIVEIRA; SILVA, 2007; RESENDE; BRAGA, 2014)
Analyses of variance of data obtained from testing conducted at the Foundation Mokiti Okada (NA) showed significant effects for the families to the characters COMP, a * X, TP, type of shoulder (TO) and leaf blight (LB)
The heritability values obtained in the test performed in organic farming system (OA) for the characters a*X and a*F were several orders of magnitude higher than those generated on the Natural Agriculture (NA). These results suggest that evaluation of carrot genotypes for the characters to a*X and a*F in the cropping system Organic Agriculture (OA) has a greater chance of success than if performed in the cropping system NA
Summary
The carrot (Daucus carota L.) is among the five most important vegetable crops in Brazil, considering the crop area or value of production (MAROUELLI; OLIVEIRA; SILVA, 2007; RESENDE; BRAGA, 2014). There is increasing among consumers the demand for better quality of carrot roots associated with the use of cultivars with good sustainability of cultivation, in search of a healthier diet and products with good visual quality and nutrition, free of pesticide residues and even with some functional properties Due to these demands, in particular the interest in products with low levels of pesticide residues and produce less aggressive to the environment, agroecology agriculture and its derivatives has been growing rapidly worldwide (LOPES; LOPES, 2011). Van Bueren et al (1999) note that the main differences in the breeding process for organic and conventional tillage systems are related to crop rotation practices, soil management, and diseases that normally use chemicals. These factors, if not considered, may provide differences in phenotype, performance, of improved cultivars in conventional fields and validated in organic fields
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
