Cytology of infection of <Emphasis Type="Italic">Fusarium mangiferae</Emphasis> Britz in different malformed reproductive parts of mango |
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Authors: | Zafar Iqbal Sohail Hameed Muhammad Akbar Anjum Altaf Ahmad Dasti Ahmad Saleem |
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Institution: | (1) University College of Agriculture, University of Sargodha, Sargodha, Pakistan;(2) National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan;(3) University College of Agriculture, Bahauddin Zakariya University, Multan, Pakistan;(4) Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan, Pakistan;(5) Punjab Agricultural Research Board, Lahore, Pakistan; |
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Abstract: | Aetiology of mango malformation (MM) has intrigued the scientists since its inception. The objective of the study was to glean
an insight into association of the fungus, Fusarium mangiferae, with different malformed regions, viz. panicle-shoot juncture, apical buds, primary and secondary peduncles, in five exotic
mango cultivars. Tissue assays revealed an infection of 88.5, 84.75 and 82.5% in cvs Zill, Sensation and Tommy Atkins, respectively.
Least infection of 69.75% was found in cv. Keitt. No exotic cultivar was found to be free of fungal infection. Apical buds
proved to be the potential infection site of the fungus amongst the four malformed regions, hosting maximum within-tissue
infection of 86.2%. Determination of F. mangiferae at proximal and distant sites of the malformed panicles exhibited maximum recovery of 82.0% at 0 cm and only 3% at >30 cm
distance beneath the panicle. In the case of non-malformed panicles, an infection of 14.0% was recorded at 0 cm distance while
no detection could be made from non-malformed branches. Moreover, examination of ultra-thin bud sections under Transmission
Electron Microscopy (TEM) revealed inter- and intra-cellular ramification of fungal hyphae, indicating fungal ingress in malformed
bud tissues of local cv. Malda. The present studies explored the sites hosting the causal fungus in mango and provide convincing
evidence that F. mangiferae is responsible for turning healthy tissues into the malformed condition. These findings suggest that inoculum specific management
strategies are needed in future to curb malformation disease in mango orchards. |
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