Effect of mycorrhizae and actinomycetes on growth and bioprotection of capsicum annuum L. Against phytophthora capsici

To evaluate the inoculation effect of arbuscular mycorrhizal fungi (amf) and actinomycetes on promoting plant growth and diminishing wilt in pepper plant (capsicum annuum l.),a pot experiment was conducted under greenhouse conditions using a factorial design on random blocks. it was evaluated the native cerro del metate mycorrhizal consortium,and abv39 and abv02 actinomycetes were evaluated against the ch11 stain of phytophthora capsici. responses of the variables evaluated were plant height,stem diameter,number of leaves,total fresh and dry biomass,leaf area and radical volume,number of amf spores,mycorrhizal colonization,roots infected with p. capsici,and severity of wilting utilizing an ordinal qualitative scale. the results showed that mycorrhizal plants and inoculated with abv39 demonstrated the highest values for plant height,stem diameter,and number of leaves with 26.12 cm,5.29 mm,and 35.12 leaves,respectively. co-inoculation of amf and both actinomycetes significantly promoted (p≤0.001) total fresh and dry biomass and leaf area of the plants without p. capsici. the disease severity of the amf-inoculated plants diminished against plants without mycorrhization. however,when they were also co-inoculated with abv39 or abv02,disease severity was significantly reduced (p≤0.05),up to level 2 of 5 levels on a severity scale. these results show a synergetic effect with co-inoculation of amf and actinomycetes in vegetal growth promotion and bioprotection against wilting caused by p. capsici in pepper plants. © 2017,university of agriculture. all rights reserved.