数字农科院2.0

Genetic Variability and Aggressiveness of Tilletia indica Isolates Causing Karnal Bunt in Wheat

文献类型： 外文期刊

作者： Aasma;Shahzad Asad;Muhammad Fayyaz;Khawar Majeed;Aziz Ur Rehman;Sajid Ali;Jindong Liu;Awais Rasheed;Yamei Wang

作者机构：

关键词： Bread wheat;Fungal disease;Genetic variability;Karnal bunt;Tilletia indica;Virulence

期刊名称： Journal of Fungi

ISSN： 2309-608X

年卷期： 2022 年 8 卷 3 期

页码：

收录情况： JCR（2021版）

摘要： Karnal bunt caused by Tilletia indica is a quarantine disease of wheat causing huge economic losses due to the ban on the import of bunted grains. This study was designed to characterize pathogenicity, aggressiveness and genetic diversity of 68 Tilletia indica isolates collected from different geographic regions of Pakistan. Forty-six isolates were tested for their pathogenicity on eight wheat varieties, out of which three were non-aggressive. The coefficient of infection (CI) ranged from 15.73% (PB-25) to 10% (PB-68, PB-60, and PB-43). The isolates collected from central Punjab showed higher infestation compared to other isolates. Among the wheat varieties used for the aggressiveness study, WL-711 showed susceptible reaction with 10.88% CI, while NIFA-Barsat, HD-29, Janbaz, Bakhtawar-92, Tatara, and AARI 2011 showed resistance to the highly resistant response. These isolates were amplified using 31 random amplified polymorphic DNA (RAPD) markers and 32 inter-simple sequence repeat (ISSR) markers for diversity analysis. The principal component analysis (PCA) and analysis of molecular variance (AMOVA) showed greater divergence among isolates collected from Punjab and Khyber Pakhtunkhwa (KPK), with a moderate level of admixture. The isolates from Faisalabad (Punjab) were more aggressive compared to isolates from KPK and were clearly separated based on PCA, indicating the significant genetic distance in the populations. Our findings will assist breeders and pathologists in better understanding the pathogenic variability in Tilletia indica and in subsequent disease management.

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