Abstract
ABSTRACT The lack of knowledge of the genetic parameters and the type of gene action results in difficulties to obtain varieties that combine agronomic and functional characteristics. The objective of this study was to determine the type of gene action associated with the contents of chlorophyll and agronomic characteristics in lettuce populations. The research was conducted at the Experimental Station of Vegetables, Monte Carmelo, Brazil. To perform the crosses and obtain the generations P1, P2, F1, F2, Bc1 and Bc2 the genotypes UFU-Albina#2, UFU-Albina#3, UFU-Lisa124#2#1, UFU-Crespa199#1#1 and UFU-Lisa217#5#2 were used as parents. The generations were evaluated for three characteristics: number of leaves, plant diameter and chlorophyll content. The parameters: genetic, phenotypic, environmental and additive variance, the dominance in F2, heritability in the broad and narrow-sense, the average degree of dominance based on averages, number of genes, the measure of the dominance deviations, additive effects and all interactions of ‘additive x additive’, ‘additive x dominant’ and ‘dominant x dominant’ type, were evaluated. Chlorophyll content was the most influenced by the environment. Plant diameter had the highest narrow-sense heritability for the cross UFU-Lisa-124#2#1 x UFU-Albina#3 (82.1%). The number of genes for the number of leaves varied from inconclusive to a minimum of 9 genes. The gene interactions for number of leaves were of overdominance type, while for plant diameter and for chlorophyll content the gene interactions were of partial dominance. The characteristics are suggested as being of polygenic or oligogenic nature.
Highlights
Lettuce (Lactuca sativa L.) is the leafy green vegetable with the greatest economic importance in Brazil (GOMES et al, 2016, BRZEZINSKI et al, 2017).To meet the growing demand for processed lettuce, there is a need to select several agronomic traits that are routinely evaluated in experiments of performance
The experiment was conducted from February 2017 to June 2018 at the Experimental Station of Vegetables, Monte Carmelo, MG, Brazil (18° 42'43.19"N, 47°29'55.8"W, at 873 m of altitude)
Minimum number of genes involved in determining the character: to that of the other generations
Summary
Lettuce (Lactuca sativa L.) is the leafy green vegetable with the greatest economic importance in Brazil (GOMES et al, 2016, BRZEZINSKI et al, 2017). To meet the growing demand for processed lettuce, there is a need to select several agronomic traits that are routinely evaluated in experiments of performance. Genotypes that have great number of leaves are preferred (SALA; COSTA, 2012; RESENDE et al, 2017). There are reports of commercial cultivars with number of leaves above 33 per plant (DIAMANTE et al, 2013). Plants with a diameter greater than 30 cm are not commercially interesting. Suinaga et al (2013) reported that large plant diameters hinder transport, especially during the preparation of the plant in containers
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