Genetic control of leaf spinescence in BRS Imperial, Pérola, and Pico de Rosa pineapple cultivars

• Published in: Crop breeding and applied biotechnology Vol. 21; no. 1
• Main Authors: Lira Júnior, José Severino de, Bezerra, João Emmanoel Fernandes, Andrade, Domingos Eduardo Guimarães Tavares de
• Format: Journal Article
• Language: English
• Published: Vicosa Crop Breeding and Applied Biotechnology 2021
• Subjects: AGRONOMY; BIOTECHNOLOGY & APPLIED MICROBIOLOGY; Chi-square test; Cultivars; Epistasis; Genetic control; Genetic crosses; Genotypes; Heterozygosity; Homozygosity; Hypotheses; Leaves; Offspring; Phenotypes; Pineapples; Progeny; Ananas comosus var. comosus; spineless leaf; spiny; genotype
• ISSN: 1518-7853; 1984-7033; 1984-7033
• DOI: 10.1590/1984-70332021v21n1a2

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. × Pérola 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” × “Pérola” 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 (“Pérola” and “Pico de Rosa”) is controlled by the “ppss” genotype.