IDENTIFICACIÓN DE ALGUNAS ESPECIES DE MICROORGANISMOS BENÉFICOS EN LA RIZOSFERA DE GERBERA Y SU EFECTO EN LA PRODUCTIVIDAD

Abstract

We identify the mycorrizal fungi (HMA) species living in the rhizosphere of Gerbera jamesonii cv. Bolus and the plant growth promoting bacterial (PGBP) genera attracted by those radical exudates. The chemoattraction of some plant growth promoting bacterial toward root exudates of this crop was also evaluated. The espermospher model was used for bacterial isolation and Collector tubes and the chemotaxis camera modified for the evaluation of the chemotactic effect of those radical exudates. To the bacterial characterization, was carried out micromorphological determinations (mobility, endosporas presence and others) and cultural determinations (forms, size, opacity and others). Five replications per treatment were used three times. Five micorrizal fungi species and four plant growth promoting bacterial genera attracted by gerbera radical exudates were found, almost Glomus genus were predominant, being Glomus hoi like specie the principal one. Pseudomonas (30 %) was the predominant genus among bacterials. Taking into account these results, adult plants were established in recipients of five litres of capacity, were inoculated using red ferralitic soil mixed with cow dung in a proportion of 2:1. The evaluated variables were yield and floral capitulum diameter and root colonization, finding that inoculated plants with Glomus hoi like had more root occupation (1.91 %), more mycorrizal fungus espores (5.6 espores·ml-1) and bacterial (8.2 log UFC·ml-1) in the rhizosphere and more flowers (35).