Morphological characterization and differential virulence of various Pakistani isolates of Fusarium oxysporum f. sp. tuberosi

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Research Paper 01/05/2018
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Morphological characterization and differential virulence of various Pakistani isolates of Fusarium oxysporum f. sp. tuberosi

Sania Ahmed, Abid Riaz, Abdul Rauf, M. Kauser Nawaz Shah
Int. J. Biosci. 12(5), 63-71, May 2018.
Copyright Statement: Copyright 2018; The Author(s).
License: CC BY-NC 4.0

Abstract

Fusarium wilt of potato caused by Fusarium oxysporum is a soil borne fungus that causes huge losses to the potato growers in Pakistan. Limited information is available about this pathogen. Therefore, a survey was conducted to different areas of Punjab to collect the disease samples and they were morphologically identified on the basis of size and shape of microconidia, macroconidia and chlamydospores. Microconidia were oval shaped with no septation whereas macroconidia were straight in shape that were slight curved at apex having 3-5 septations. Pathogenicity test was performed on susceptible potato variety Desiree. Out of 43 isolates, three isolates showed high virulence i.e. W8 (70.80%), S1 (81.75%) and O1 (84.38%). Yield reduction by highly virulent isolates ranged from 59.92 % to 76.26 %.  Ten isolates showed moderately virulent response W7 (53.08 %), O3 (55.76 %), TS1 (53.85 %), TS2 (56.14 %), BM3 (53.60 %), FD1 (44.35 %), CT2 (43.00%), O5 (43.0%), N1 (41.81%), and O2 (49.53 %). Yield reduction by moderately virulent isolates ranged from 45.58 to 52.42 %.  Thirteen isolates viz. FD2, BM1, CT3, N2 , C1, C2, T2, B3, B4 , B1, B2, S5 and W4  yield reduction ranged from 9.64 % to 28.59 %.  Three isolates were highly virulent, 5 exhibited  moderately virulent and rest of the isolates were avirulent. The recent study will help for efficient management of the pathogen through host plant resistance.

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