The genus Coffea spp. is the most important of the Rubiaceae family and both Coffea arabica L. and Coffea canephora P. constitute the most economically important species. This research aimed to characterize morphologically, and physiologically diazotrophic rhizobacteria associated with coffee plants from a living collection, and to study their plant growth promoting potential. Semi-solid nitrogen-free media NFb and JNFb were used to isolate the bacteria. Ten isolates were selected for micromorphological, physiological and plant growth potential characterization. The results showed that high population levels of bacteria, fungi and actinomycetes are present in the rhizosphere of the coffee collection. 95 native isolates were selected, and 8 were classified as Azospirillum and Herbaspirillum. The multivariate cluster analysis resulted in the formation of three groups, the C8 grouped with the positive control in one of them. The beneficial potential of this isolate makes it a source of interest to develop a biostimulant product that could be applied as a sustainable alternative for the cultivation of Coffea sp.

Dra. Sandra Pérez Álvarez is Titular professor at Faculty of Agricultural and Forestry Sciences of the Autonomous University of Chihuahua. She gets her university degree in 1993 as Agronomic Engineer at the Agrarian University of Havana, Cuba and her master degree in Plant Pathology in 2001 at Zhejiang University in China. In 2009 she graduated as Doctor in Agricultural Science at the Agrarian University of Havana, Cuba. Dra. Sandra was a professor of Plant Physiology for 18 years at the Agrarian University of Havana, Cuba, for that she received the Medal for Cuban Education. Dra Pérez Álvarez had researchers with heavy metals, plant-pathogen interaction specifically with the tobacco mosaic virus and with several in vitro technologies mainly reflected in thesis. She has 40 publications in Cuban and international journals 18 of them are in JCR journals or Scopus, 16 book chapters published, 8 of them with Springer editorial. She has been participated in several internationals congress. At the moment she is a member of the National System of Researchers of Mexico level 1.