Plant Pathology Journal

Volume 21 (1), 1-11, 2022


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Antagonistic Effect of Aluminium Toxicity and Water Deficiency on the Virulence of Pyrenophora teres in Barley

Javan Omondi Were, Julius Onyango Ochuodho, Nicholas Kipkemboi Rop and Sanjaya Gyawali

Background and Objectives: A combined effect of aluminium toxicity, drought and net blotch severity stands out to be a major bottleneck hindering the realization of potential yields by the newly released barley varieties in Kenya. However, the relationship among the 3 remains unstudied and undocumented. The study aimed at determining the pre-exposure effect of aluminium toxicity and water deficiency on barley to the severity levels of net blotch foliar disease. Materials and Methods: Twenty four trait-specific barley were planted in a split-plot arrangement in a completely randomized design with 3 replications. The main plots were 20 and 80% field capacities and 148 μM Al while the 12 winters and 12 spring adapted genotypes planted separately represented the sub-plots. Drought and aluminium toxicity stresses were introduced immediately after seedling emergence. Sub-plot inoculation with Pyrenophora teres isolates was done at Zadoks growth stage 15 using 5×103 conidia mL–1. Severity assessment was based on a 0-7 severity scale and the data were subjected to multivariate and meta-analysis on Genstat statistical package version 16.0. Results: Initial exposure to abiotic stress led to the expression of low severity levels in all barley genotypes but this varied from one genotype to another informed cluster. Genotype x environment interactions had a significant influence on severity levels and genotype stability as displayed by the rankings, comparisons and which-won-where polygon views of the GGE biplots. Conclusion: In conclusion, initial exposure to aluminium toxicity and water deficiency-induced significant tolerance to net blotch disease in barley irrespective of their genetic constitution and the genotype x environment interaction played a significant role in severity levels and symptom expression.

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How to cite this article:

Javan Omondi Were, Julius Onyango Ochuodho, Nicholas Kipkemboi Rop and Sanjaya Gyawali, 2022. Antagonistic Effect of Aluminium Toxicity and Water Deficiency on the Virulence of Pyrenophora teres in Barley. Plant Pathology Journal, 21: 1-11.


DOI: 10.3923/ppj.2022.1.11
URL: https://ansinet.com/abstract.php?doi=ppj.2022.1.11

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