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Inheritance of leaf spininess and segregation of leaf color in pineapple (Ananas comosus L. Merrill)

José Alfredo Usberti Filho^I; Walter José Siqueira^I; Ademar Spironello^II; Marli Harris^I; Ana Claudia de Carvalho Badan^I

^IInstituto Agronômico de Campinas, Seção de Genética, Caixa Postal 28, 13001-970. Campinas, SP, Brasil. Send correspondence to J.A.U.F.
^IIInstituto Agronômico de Campinas, Seção de Fruticultura Tropical, Campinas, SP, Brasil

ABSTRACT

Progenies from 13 artificial and six open-pollinated intervarietal pineapple crosses were analyzed for leaf spininess and leaf color. A new hypothesis for the inheritance of the leaf spininess trait based on the observed segregations is put foward. It clearly explains the segregation of 11 out of the 13 artificial crosses, whereas the current accepted hypothesis (Collins and Kernes, J. Heredity 37: 123-128, 1946) explains only eight of the 13 crosses.
Three crosses were crucial for the acceptance or rejection of both hypotheses. The crosses Boituva x Smooth Cayenne and Pérola x Smooth Cayenne, which involve "non-piping" and heterozygous for the S locus (Ss) parents, gave rise to spineless individuals in the offspring, at the expected frequency of three spiny to one spineless. This fact cannot be explained by Collins and Kernes' (1946) hypothesis. The cross Roxo-de-Tefé x Rondon resulted in nearly 100% spiny descendants, different from the frequency expected by the Collins and Kernes' hypothesis (50% spiny: 50% spineless).
The new hypothesis allows the identification of two new clones as "piping" types (Manauara Inerme and Pina Negra) and confirms that the genotypic constitution of the Rondon clone is probably ppss (spineless "non-piping"). When the genotype is pp, the S locus produces the completely spiny phenotypes (ppSS and ppSs), which are dominant over the spineless one (ppss). The partial leaf spininess of the cultivar Smooth Cayenne, described as heterozygous for the S locus (ppSs), must be caused by genotype x environment interactions, genetic background effects, modifying genes and/or other unknown facts. Green leaf color has incomplete dominance over purple leaf color, but green predominates.

Keywords: leaf spininess; leaf color; pineapple.

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