Abstract

M., Constantino et al. Effect of biofertilization and bioregulators on germination and growth of Carica papaya L. Rev. colomb. biotecnol [online]. 2010, vol.12, n.2, pp.103-115. ISSN 0123-3475.

In order to increase and accelerate the process of seed germination and obtain a high yield and homogeneity of papaya seedlings cv. Maradol in nurseries, we evaluated the effect of three biofertilizers applied single or in combination (Azotobacter chroococcum, Azospirillum brasilense and Glomus intraradices) and a plant growth bioregulator, the gibberellic acid 3 (AG₃), on the germination and subsequent growth of papaya seedlings. An experimental design completely random with eight treatments and three replications were used. The application of a pre-germinal treatment with alternating temperature had to be applied to seeds to overcome dormancy. Single biofertilization with A. chroococcum and A. brasilense, promoted the germination percentage 90.28 y 88.89% respectively. Germination rate could be enhanced and the mean germination time was reduced with the application of biofertilizer and AG₃. Both applications on seeds and leaves of biofertilizers and AG₃, had a positive effect on plant growth. The population of A. chroococcum was higher in the combined inoculation with G. intraradices. The prevalence of colonization of plants inoculated with G. intraradices ranged from 18.53 to 26.67%, with the greatest values recorded for the treatment involving combined inoculation with A. brasilense. Finally, with the application of this methodology the seed germination rate was improved, as well as the uniformity of seedlings emergence.

Keywords : Azospirillum brasilense; Azotobacter chroococcum; Glomus intraradices; gibberellic acid; dormancy.

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