Nodule phosphorus requirement and O₂uptake in common bean genotypes under phosphorus deficiency

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

“…The highest phosphorus use efficiency and nitrogen accumulation in the present work was obtained in the plants grown with mycorrhized Stylosanthes or in plants inoculated by Glomus ( Figures 5A and C) illustrates the relationship between P use efficiency and symbiotic nitrogen fixation (Tang et al, 2001, Tajini et al, 2011 and demonstrates that the mechanisms affecting the efficiency of absorption and utilization of phosphorus in plants are related to colonization by AMF (Bucher et al, 2001;Jia et al, 2004). It was also indicated that the shoot growth and N2 fixation were determined mainly by the efficiency in P utilization (Rodino et al, 2009, Bargaz et al, 2011a.…”

“…In the hydroaeroponic culture where P levels are replenished weekly, shoot growth and N2 fixation appear to be controlled by the efficiency in P utilization as previously observed by Rodino et al (2009) andbargaz et al (2011a, b). The highest phosphorus use efficiency and nitrogen accumulation in the present work was obtained in the plants grown with mycorrhized Stylosanthes or in plants inoculated by Glomus ( Figures 5A and C) illustrates the relationship between P use efficiency and symbiotic nitrogen fixation (Tang et al, 2001, Tajini et al, 2011 and demonstrates that the mechanisms affecting the efficiency of absorption and utilization of phosphorus in plants are related to colonization by AMF (Bucher et al, 2001;Jia et al, 2004).…”

“…Plants deficient in P show decreased nodule-number (Vadez and Drevon, 2001), and biomass when grown in soil, sand and alkaline solution, or hydroaeroponics (Araújo et al, 1997;Bargaz et al, 2011a, b;Mandri et al, 2011;Vadez and Drevon, 2001). The present study provides additional evidence that nodulation could be improved by dual inoculation in plants grown with mycorrhized Stylosanthes or in plants inoculated by Glomus under P deficient conditions.…”

Specific expression and activity of acid phosphatases in common bean nodules

“…4). [4][5][6][7][8][9] Moreover, both the activation of TPP especially in infected cells and the appearance of trehalose in nodules at the onset of N 2 fixation, 36 substantiate a physiological role of TPP in regulating nodule O 2 diffusion. Our results report that bacteroids in infected cells exhibit high TPP and supports the hypothesis that trehalose (A and B), 200 μm in (C, E, F, G and H) and 50 μm in (D).…”

“…1 The limited availability of P reduces not only allocation of P into nodules and P use efficiency by shoot 2 but also has deleterious effect on N 2 fixation that has been reported to be directly related to declines in biomass of nodules and shoot. [3][4][5][6][7] Although P-deficiency has a large negative impact on plant growth and development, it appears to be especially detrimental for N 2 -fixing legumes because of the specific requirement of P for symbiotic N 2 fixation. 8 In spite of widely documented sensitivity of N 2 -fixing legumes to P-deficiency, the ability of nodules to act as strong P sinks is still not fully understood, although it predicts the important role of P in nodule functioning.…”