Abstract
Abstract Leaf spinescence in pineapple plants was evaluated in a total of 2.014 F1 individuals as follows: 1.125 plants of the progeny of the Imperial BRS cv. × Perola cv. cross, and 889 plants of the progeny of the Pico de Rosa cv. × BRS Imperial cv. cross. The genetic hypothesis with two loci and epistatic interaction of the piping (P) over spiny (S) trait was tested. The chi-square test was performed on deviations between the observed and expected numbers based on the genetic hypotheses formulated. The “BRS Imperial” × “Perola” and “Pico de Rosa” × “BRS Imperial” progenies segregated into 1:0:1 (spineless:spiny tip:spiny), expressing phenotypes of their respective parents. The spineless leaf (“BRS Imperial”) is determined by the “Ppss” genotype, with the locus “P” in heterozygosity and the locus “S” in recessive homozygosity. The spiny leaf margin (“Perola” and “Pico de Rosa”) is controlled by the “ppss” genotype.
Highlights
The presence of spines/thorns on the pineapple leaf margin creates difficulties in seedling handling operations during planting, crop management practices, and fruit harvesting as it requires complete protection against scratches/cuts on hands, arms, and legs, which hinders workers’ movement among plants
The main pineapple cultivar planted in Brazil (Reinhardt et al 2018), known as “Pérola” or “Branco de Pernambuco”, has spiny leaf margins and vigorous growth, with long leaves and dark green color
The objective of this paper was to determine the genotypic combinations associated with control of pineapple leaf margin spinescence in “BRS Imperial”, “Pérola” and “Pico de Rosa” based on the phenotypic evaluation of segregating progenies developed by the plant breeding program of the Agronomic Institute of Pernambuco State - IPA (Instituto Agronômico de Pernambuco)
Summary
The presence of spines/thorns on the pineapple leaf margin creates difficulties in seedling handling operations during planting, crop management practices, and fruit harvesting as it requires complete protection against scratches/cuts on hands, arms, and legs, which hinders workers’ movement among plants. Leaves without spines along the entire leaf margin facilitates these crop operations and provides consumers with greater convenience in handling the pineapple and holding it by the crown at farmer’s markets and supermarkets, as well as during cleaning operations, storage, and manual peeling. Is similar to the Pérola cv., but differs in cylindrical fruit shape and yellowish pulp color. Both cultivars are highly susceptible to fusariosis, a fungal disease (Fusarium guttiforme) that severely affects Brazilian production
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