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Effect of Glomus intraradices in improving the tolerance of a hybrid family of Theobroma cacao L. against Phytophthora megakarya

Research Paper | April 1, 2019

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Simo Claude, Fankem Henri, Njonzo-Nzo Stephanie Alvine, Tassong Saah Denis, Taffouo Victor Desire, Djocgoue Pierre François

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Int. J. Biosci.14( 4), 76-94, April 2019

DOI: http://dx.doi.org/10.12692/ijb/14.4.76-94


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The cocoa tree (Theobroma cacao L.) is a perennial plant of economic importance grown in several cocoa producing countries. Phytophthora megakarya is an oomycete that has a negative impact on cocoa production in Cameroon causing substantial yield losses (up to 100%). To remedy this, the use of genetic resources for the selection of highly tolerant genotypes is necessary for its production. The leaf necrosis of cacao in absence and in the presence of Glomus intraradices was measured, the accumulation of phenolic compounds was evaluated in the leaves of genotypes after Phytophthora megakarya infection in the absence and presence of Glomus intraradices. The analysis maps of the development of necrosis and the accumulation of phenolic compounds obtained on the basis of the necrotic area and the contents of phenolic compounds was used to appreciate the degree of tolerance of the hybrid genotypes againts Phytophthora megakarya. In addition, the development of necrosis on surfaces less than 0.5 cm2 in the presence of Glomus intraradices was observed in 75% against 94% (without control of G. intraradices) of hybrid genotypes. Glomus intraradices have significantly improved the tolerance of these hybrid genotypes. Moreover, it has been found that some hybrid genotypes of the Ficup offspring exhibiting better tolerance with necrotic surfaces between 0 and 0.5 cm2 in the presence of G. intraradices. Sensitive hybrid genotypes in the presence of G. intraradices, increased their degree of tolerance against the attack of Phytophthora megakarya. This G. intraradices can therefore be used by farmers in cocoa plantations to improve their yield.


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Effect of Glomus intraradices in improving the tolerance of a hybrid family of Theobroma cacao L. against Phytophthora megakarya

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