Micorriza arbuscular, Bacillus y sustrato enriquecido con vermicomposta en el desarrollo de plantas de papayo | Arbuscular mycorrhizae, Bacillus and substrate enriched with vermicompost on the development of papaya plants
2005
Lopez-Moctezuma, H. | Ferrera-Cerrato, R. | Farias-Larios, J. | Aguilar-Espinosa, S. | Bello, M. del R.F. | Lopez-Aguirre, J.G.
The effect of inoculation of arbuscular mycorrhizal fungi (AMF) and plant growth promoting rhizobacteria (PGPR) on the development of papaya (Carica papaya L.) plants grown on a soil enriched with 40% vermicompost was assessed. It was proved that the roots of the plants are colonized by the AMF in a percentage above 17 with a marked influence on their development, while the bacteria did not influence the increase of AMF colonization. The AMFs favored the growth of the bacteria in the rhizoplane, indicating a mutualistic association between the Glomus Zac-19 complex and Bacillus pumilus. In the first growing phase [64 days after transplant (DAT], the AMF and AMF+Bacillus pumilus propitiated the best growth, being even better when they were inoculated with just AMF. After 115 DAT, the plants inoculated with these two microorganisms were the ones that registered the best growth as well as the highest number of flowers (five flowers), surpassing those from the other treatments. The elevated availability of nutrients and the mutualistic association of AMF and AMF + bacteria favored the absorption of some nutrients such as P and Zn, which could have an influence in the plants shortening their juvenile phase from 160 to 115 DAT. The B. pumilus and B. macerans stumps inoculated separately showed a similar effect promoting the growth and flowering of papaya, surpassing the inoculated plants, but B. pumilus was more efficient than B. macerans plus the AMFs. During the flowering process, P content was 50% less than in the growing plants.
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