Effect of metabolites ofAspergillus niger andTrichoderma viride on development and structure of radicle of cocoa (Theobroma cacao) seedlings |
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Authors: | G T Odamtten G C Clerk |
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Institution: | (1) Department of Botany, University of Ghana, P.O. Box 55, Legon/Accra, Ghana;(2) Present address: Department of Botany, University of Port Harcourt, Port Harcourt, Nigeria |
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Abstract: | Both the volume and concentration of filtrate ofAspergillus niger andTrichoderma viride influenced the development of the radicles of cocoa seedlings. Radicles placed in Petri dishes containing filter paper moistened
with 20 and 30 ml of undiluted filtrate and filtrate dilutions of 1∶1 and 1∶2 failed to develop lateral roots and eventually
died.
The culture filtrate ofA. niger was more repressive. Radicles in the same volume of filtrate (20 and 30 ml) of higher dilutions (1∶5 and 1∶10) developed
lateral roots and survived. Radicles placed in less volume (≤10 ml) survived and produced lateral roots irrespective of concentration
of filtrates. Development of the radicles and roots in the control was consistently better (P=0.05) than in filtrate solutions of eitherA. niger orT. viride.
The hypocotyls of seedlings under the influence of metabolites ofA niger showed greater cambial activity and formed xylem vessels and tracheids with larger lumina. |
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Keywords: | Aspergillus niger cocoa fungi radicles Theobroma cacao Trichoderma viride |
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