Variabilidade genética de progênies de meios-irmãos de cebola submetidas ao estresse salino.

Abstract

The culture of onion due to its productive potential and nutritional value is one of the most important vegetable crops in the world, representing a significant source of income in irrigated high areas São Francisco in the Brazilian Northeast where soil salinity risks constitute obstacles to the full development of culture. This study aimed to estimate the genetic variability of the cultivar, ValeOuro IPA-11, as its tolerance to salinity by estimating genetic parameters as the characters emergency speed index, germination, leaf length on growth rate, number of leaves, survival and dry matter. Therefore, we analyzed 50 progenies of half-sib, obtained from individual plants seed harvest taken at random in seed production field in Petrolândia-PE in November 2014 and submitted to three levels of salinity in sub-irrigation system in a greenhouse at the Federal Rural University of Pernambuco, Recife-PE, between the months of May and June 2015. The experimental design was a randomized block in split plot with three replications. The genetic parameter estimates showed that there is genetic variability among the progeny derived from onion cultivate ValeOuro IPA-11 as tolerance to salt stress, making it possible chance of success in the selection of superior materials in future breeding programs. The genetic correlation estimates indicated that selection for length characters of leaf, leaf number and survival can increase the production of dry matter in salt stress conditions.