Abstract

TCACH, M.A; FOGAR, M.N; RIOS, R.D  and  ACUNA, C.A. Resistencia de los botones florales del algodón Gossypium hirsutum L. a Spodoptera frugiperda Smith. RIA. Rev. investig. agropecu. [online]. 2015, vol.41, n.2, pp.161-167. ISSN 1669-2314.

There are mutant alleles in the genus Gossypium that increase the tolerance to insect pests. Among the features that are effective against different insects high glanding [i.e., presence of gossypol glands in the upper edge of the sepals of the flower bud] increases the tolerance to Lepidoptera insects. The objective of this research was to evaluate the relationship between the age of the flower buds and the resistance to Spodoptera frugiperda. Flower buds of different ages were characterized for gland densities and bioassays with larvae of S. frugiperda were carried using these buds. The density of gossypol glands in reproductive structures decreased as the size of flower buds increased while growing, in both high and normal glanding genotypes. The weight of the larvae of S. frugiperda was significantly lower when fed with smaller high glanding buds. The larvae fed with high glanding reproductive structures had lower weight when compared with those fed with material from the normal glanding genotypes. These evidences show that high glanding is an antibiotic factor in larvae of S. frugiperda, as in other lepidopteran species.

Keywords : Mutant alleles; Cotton; High glanding; Plant breeding; Insect resistant; Gossypol.

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