Selection of carrot progenies for seed germination at high temperatures
The germination and establishment of carrot cultivars in warmer climates is the key to competitiveness of agribusiness in northern and northeastern areas of Brazil or even in other Brazilian regions during summer time. Thus, this study aimed to select progenies of carrot for germination at high temperatures. The experiment was carried out in the Seed Laboratory at Embrapa Vegetables, Brasilia, DF, Brazil. Forty progenies from the population CNPH-606 of the carrot breeding program at Embrapa Vegetables were evaluated. Seeds were sown on germination paper moistened with distilled water in a ratio of 2.5 times the weight of dry paper, and incubated at two temperatures, 20°C (optimum) and 35°C (adverse). Seed germination was performed at 7 and 14 days of incubation. Also, field emergence was performed under field conditions, using four replicates of 100 seeds. Results were expressed in percentage of normal seedlings obtained at 14 days after sowing. Analyses were performed using ANOVA and the coefficients of heritability and response to selection were obtained. Genetic variability was observed at both temperatures and in the field. The heritability coefficients ranged from 0.64 to 0.94 and showed higher efficiency in the selection process submitted to germination at 35°C. Selection gains were 17 and 4.5% at 35 and 20°C, respectively. Results show that there is sufficient genetic variability to select progeny with higher ability to germinate and for stand establishment, especially at high temperatures.
Carvalho, A.D.F., Silva, P.P., Silva, G.O., Nascimento, W.M. and Souza, C.V.A. (2019). Selection of carrot progenies for seed germination at high temperatures. Acta Hortic. 1249, 181-184
Daucus carota L., seedling establishment, genetic variability