02252nas a2200277 4500008004100000022001400041245016800055210006900223260002900292300001400321490000800335520129600343653001601639653003301655653001001688653002701698653001801725100003201743700002201775700002301797700003701820700001901857700001701876700002601893856005501919 2012 eng d a1439-043400aGrowth enhancement, amino acid synthesis and reduction in susceptibility towards Phytophthora megakarya by arbuscular mycorrhizal fungi inoculation in cocoa plants0 aGrowth enhancement amino acid synthesis and reduction in suscept bBlackwell Publishing Ltd a220–2280 v1603 a

The effects of some selected arbuscular mycorrhizal (AM) fungi, Gigaspora margarita and Glomus mossae on the growth and the role of soluble amino acids of two contrasting cocoa cultivars (ICS84 tolerant and SNK10 sensitive) against black pod disease caused by Phytophthora megakarya were investigated. Root colonization by AM fungi is between 50 and 70% 18 weeks after planting. Tested AM fungi significantly increased all the plant growth parameters (height, number of leaves, shoot and root matter) and P uptake as compared to non-inoculated plants in pot experiments. AM fungi inoculated cocoa reduced the disease severity. Compared to the control, the soluble amino acid levels increased with inoculation of the AM fungi strains in the necrotic stems of disease on inoculated cocoa plants. Significant relationships between amino acids and disease severity observed for two cocoa cultivars imply that the induction of specific amino acids synthesized by leaves, such as arginine, cysteine and glutamic acid, may represent potential candidate molecules for adaptation of such cultivars to P. megakarya disease. Inoculating seedlings with AMF in nurseries could enhance the development of cocoa plants protected against P. megakarya.

10aamino acids10aarbuscular mycorrhizal fungi10acocoa10aPhytophthora megakarya10aplant disease1 aTchameni, Séverin Nguemezi1 aNwaga, Dieudonné1 aWakam, Louise Nana1 aMangaptche Ngonkeu, Eddy Leonard1 aFokom, Raymond1 aKuaté, Jean1 aEtoa, Francois-Xavier uhttp://dx.doi.org/10.1111/j.1439-0434.2012.01888.x