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Plant Pathology Journal
Year: 2008  |  Volume: 7  |  Issue: 1  |  Page No.: 34 - 39

Genotypic Variability for Alternaria alternata (Fr.) Keissler Infection in Bread Wheat

Muhammad Shahab Saqib, S. Jawad A. Shah, Fida Muhammad, Muhammad Ibrahim and Sajid Ali    

Abstract: Naturally infected grains of nineteen candidate wheat lines along with local check were studied for black point symptoms at Nuclear Institute for Food and Agriculture (NIFA), Peshawar, during 2005-06. Data were recorded on the percent incidence, black point symptoms and thousand grain weights. Results indicated that all tested candidate varieties were found susceptible to A. alternata but they differed in symptoms, incidence and severity of infection. Variability in number of affected kernels among candidate varieties fluctuated between 1.2-20.1% while its mean was < 10%. Low level incidence (i.e., < 3%) was recorded in three candidate varieties i.e., 99B4012, NRDW-1 and Wafaq 2001. Percentage of the kernels with >50% disease coverage (i.e. infection severity) varied among the tested cultivars and it was highest (i.e., 30%) in V-99022. Symptoms which were observed in all cultivars included black point, dark smudge and black specks. Based on the disease incidence level of each candidate variety, an inference regarding disease situation under field conditions was derived in which up to 46 infected seeds capable of producing disease will be entering per m2 of the field. Field prediction along with incidence and symptoms severity may be utilized as selection criteria for commercial and upcoming breeding lines and cultivars.

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