Response of ?criollo? maize to single and mixed species inocula of arbuscular mycorrhizal fungi

Abstract

We tested the effect of two single species inocula and a mixed inoculum of the native population of arbuscular mycorrhizal (AM) fungi on the growth response of "criollo" maize (Zea mays L.). To determine the inocula that produced the highest response on maize growth, we conducted a greenhouse experiment at 3 levels of P fertilization (0, 40 and 80 kg ha-l). Inoculation with Glomus mosseae (Nicolson and Gerdemann) Gerd. and Trappe (LMSS) produced the greatest shoot growth rates at the two lowest P fertilization levels. Inoculation with Acaulospora bireticulata Rothwell and Trappe (ABRT) and the native population (NP) resulted in similar shoot growth rates at all P levels. These rates were higher than the non-mycorrhizal control rate at the lowest P level but lower than the control at the highest P level. Also, ABRT and NP had significantly lower shoot growth rates than the inoculation treatment with G. mosseae at all P levels. The non-mycorrhizal control had the lowest growth rate at the lowest P level but its growth rate increased linearly with increased P fertilization. Inoculation with G. mosseae and A. bireticulata produced similar colonization rates which were lower than the native population colonization rate. There was no correlation between colonization and shoot growth rates.

Growth and nutritional responses to arbuscular mycorrhizal fungi are dependent on onion genotype and fungal species

“…Some research has suggested that inoculation with a mixed community of AMF species could potentially be more beneficial than use of a single isolate (Jansa et al 2008;Maherali and Klironomos 2007), whereas other research suggest no additive effect (Daft 1983;Gavito and Varela 1995;Janoušková et al 2009). No previous work has tested the effect of a mixed inoculum in a range of plant genotypes.…”

Efeito de diferentes isolados fúngicos da mesma comunidade micorrízica no crescimento e absorção de fósforo em soja e trevo vermelho

“…Gavito & Varela (1995), por exemplo, pretenderam cultivar e testar 14 espécies de uma comunidade fúngica associada com milho, mas eles obtiveram sucesso com apenas duas espécies. Neste estudo, apenas de três a cinco espécies foram isoladas das comunidades, mas é provável que outros fungos menos agressivos e que não estavam esporulando possam estar presentes na comunidade original, visto que três a cinco espécies de FMAs podem ser consideradas uma comunidade micorrízica relativamente simples (Morton et al, 1995).…”

Phosphate Deprivation in Maize: Genetics and Genomics

“…In maize, the benefit to the plant can vary depending on the fungal species, soil P status, and genotype (Gavito and Varela, 1995;Kaeppler et al, 2000;Bressan and Vasconcellos, 2002;Wright et al, 2005;Sawers et al, 2010). Studies realized with maize inbred lines indicate that mycorrhizal responsiveness of maize genotypes under low P, rather than the interaction with the mycorrhizal fungus as such, is a key factor in determining benefit (Kaeppler et al, 2000), although further analyses have suggested that maize germplasm may indeed harbor significant variation in the ability to profit from mycorrhizal interaction per se (Sawers et al, 2010).…”