Arbuscular mycorrhizas by contact with mycorrhized Stylosanthes guianensis enhance P use efficiency for N2 fixation in the common bean (Phaseolus vulgaris L.)

Abstract

Common bean (Phaseolus vulgaris L.) genotype Flamingo was inoculated with Rhizobium tropici CIAT899 and Glomus intraradices by mycorrhizal inoculant or by contact with mycorrhizedStylosanthes guianensis and grown under sufficient versus deficient phosphorus supply after transfer from initial sand culture, for comparing the effects of double inoculation (by contact or by inoculant) on growth, nodulation, mycorrhization of the roots, phosphorus use efficiency and total nitrogen. Although, the results showed that the double inoculation induced a significant increase in all parameters whatever the phosphorus supply and the cultivation systems in comparison to control and no significant difference between both arbuscular mycorrhizal fungi (AMF) treatments. Significant differences among colonization and nodulation of the roots and growth were found in both hydroaeroponic and sand culture. Nevertheless, the highest phosphorus use efficiency and plant total nitrogen were found under P deficiency in both AMF treatments. It is concluded that inoculation with rhizobial and arbuscular mycorrhizal fungi (by contact or by inoculant) could improve symbiotic nitrogen fixation even under phosphorus deficiency.

Crecimiento De Haba en Simbiosis Con Microorganismos Nativos De Regiones Productoras Del Norte De Puebla, México

“…En habas cultivadas en suelos alcalinos, la coinoculación de BFN y HMA incrementa el crecimiento de la planta medido como biomasa seca total (Abd-Alla et al, 2014). En frijol (Phaseolus vulgaris L.), la asociación plantahongo-Rhizobium incrementa la fijación de nitrógeno y la eficiencia en el uso del P (Tajini et al, 2012).…”