Influence of the dual arbuscular endomycorrhizal / ectomycorrhizal symbiosis on the growth of Acacia holosericea (A. Cunn. ex G. Don) in glasshouse conditions

Abstract

-Acacia holosericea plants were inoculated with a strain of Glomus aggregatum IR27 (arbuscular mycorrhizal fungus), Pisolithus tinctorius COI024 (ectomycorrhizal fungus) or with both fungi. Each fungus inoculated alone stimulated plant growth (height and shoot biomass). The response to the dual inoculation was greater than the response to either inoculant one. It may be due to the fact that the co-inoculated plants formed nodules through contaminations. However these nodules are inefficient as the N concentrations were similar in leaves of all inoculated plants with mycorrhizal fungi, alone and together. In thus, P, Ca, K, Mg and Na concentrations were not improved with respect to dual inoculation. The ectomycorrhizal colonization was significantly higher in the dually inoculated treatment than in either of the singly inoculated treatments. acacia / arbuscular mycorrhizas / ectomycorrhizas / dual inoculation Résumé -Influence de la double symbiose endomycorhiziennne et ectomycorhiziennne sur la croissance de Acacia holosericea (A. Cunn. ex G. Don.) en conditions de serre. Des plants de Acacia holosericea ont été inoculés soit avec une souche de Glomus aggregatum IR27 (champignon mycorhizien à arbuscules), soit avec Pisolithus tinctorius COI024 (champignon ectomycorhizien) ou avec les deux symbiotes fongiques. Chaque champignon a stimulé la croissance de la plante hôte (hauteur et biomasse aérienne). La double inoculation a induit une augmentation du développement de la plante supérieure à celle enregistrée lorsque les champignons étaient inoculés séparément. Ceci peut être la conséquence de la formation de nodules dus à des souches de Rhizobia contaminatrices. Toutefois, ces bactéries restent peu efficientes puisque les concentrations en azote dans les feuilles sont similaires dans les traitements avec chaque champignon ou lorsque ces isolats fongiques sont co-inoculés. Les concentrations en P, Ca, K, Mg et Na n'ont pas été modifiées par la co-inoculation. La colonisation racinaire par P. tinctorius COI024 a été significativement améliorée lorsque ce dernier a été inoculé avec le champignon mycorhizien à arbuscules. acacia / mycorhizes à arbuscules / ectomycorhizes / double inoculationAnn. For. Sci. 59 (2002) [93][94][95][96][97][98] 93

Ectomycorrhizal colonization of Alnus acuminata Kunth in northwestern Argentina in relation to season and soil parameters

“…However, some authors have found that in roots of some Acacia and Eucalyptus spp. both fungal symbionts can coexist without competition [18,27], what clearly shows that further analysis may be needed on this.…”

Effects of Mycorrhizal Fungi Inoculation on Green Pepper Yield and Mineral Uptake under Irrigation with Saline Water

“…However, shoot P contents are significantly higher in AM than nonAM plants grown under both saline and nonsaline conditions, while shoot N and K contents were significantly higher in AM than non AM plants only under nonsaline and medium (SW1) saline conditions ( Table 4). The higher mineral nutrient uptake in AM compared to nonAM plants (higher contents of N, P and K) under saline conditions likely occurred because of improvement of soil exploration by mycorrhizal extraradical hyphae that extend beyond root depletion zone which resulted in reducing antagonistic effects of salinity on nutrients uptake [25,27]. Enhanced uptake of N, P and K by AM plants has been reported by many researchers for different vegetable crops grown under saline conditions [25,[27][28][29].…”

“…The higher mineral nutrient uptake in AM compared to nonAM plants (higher contents of N, P and K) under saline conditions likely occurred because of improvement of soil exploration by mycorrhizal extraradical hyphae that extend beyond root depletion zone which resulted in reducing antagonistic effects of salinity on nutrients uptake [25,27]. Enhanced uptake of N, P and K by AM plants has been reported by many researchers for different vegetable crops grown under saline conditions [25,[27][28][29]. Concentrations and contents of Na were significantly lower in the shoots of AM than nonAM pepper plants grown under both saline but not nonsaline conditions (Tables 3 and 4).…”

Growth and litter decomposition of woody species inoculated with rhizobia and arbuscular mycorrhizal fungi in Semiarid Brazil

“…The access of the roots to the nutrients, especially phosphate, can be enhanced by the association with mycorrhizal fungi (AMF). Literature has been confirming that dual inoculation significantly increases not only dry weight, nitrogen and phosphorus content of the shoot, but also the height and diameter of trunk and reduces plant mortality index [4,15,20,[26][27][28]38]. This way such increase of the N and P concentration in the leaves increases the litter quality and improves the turnover and decomposition of the biomass which adds nutrients to soil and produces the soil organic matter (SOM).…”