Browsing by Author "Thirunarayanan P"

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Genome-wide association study of lignin trait in elite spring wheat against spot blotch disease
(Academic Press, 2024) Thirunarayanan P; Tulasi Korra; Ram Chandra
Spot blotch disease in wheat is one of major yield-limiting factor in warm humid conditions of South Asia. Developing the disease-resistant variety through molecular methods is an economically and environmentally eco-friendly approach. Diseased wheat leaves associated with lignin content increased by two or three times at 72 h compared with control. The genomic region associated with lignin content was investigated in a set of 289 diverse spring wheat genotypes. The genome - wide association studies panel employed a 90K Illumina SNP array and phenotyped in four environments. The GWAS analysis showed a total of 86 marker-trait associations on 1A, 1B, 2A, 2B, 2D, 3A, 3D, 4A, 5A, 5B, 6A, 6D, 7A, 7B, 7D were linked lignin trait. Insilco analysis revealed that significant SNPs were located on import putative candidate genes thirteen in the Transmembrane domain of the protein-kinase family and were involved in the host-pathogen interaction. The identified significant MTAs for further validation and useful for the wheat breeding programs to develop the spot blotch disease resistance. © 2024 Elsevier Ltd
Survival of the Exserohilum rostratum causal leaf spot of wheat and dissemination, infection behaviour from flower-seed-seedlings
(Akademiai Kiado ZRt., 2024) Tulasi Korra; Thirunarayanan P; Ram Chandra
The experiment was conducted on the survival of Exserohilum rostratum through different sources i.e. soil, plant debris, and seed and also observed the infection percentage from wheat flower to seed. It was found that the survival of E. rostratum frequency varied in soil from (0.00–29.29%), plant debris (0.97–27.17%) and seed (3.26–24.80%). The maximum temperature, relative humidity (RH, morning), and rainfall were negatively correlated, while the minimum temperature and relative humidity (RH, evening) were positively correlated with the survival of the pathogen. The dissemination infection percentage on the palea in WAMI1 of (63.33%) was higher, followed by Lemma in WAMI 10 (40.74%) and the least transmission in Glume of (29.63%) in both WAMI-8 and WAMI-9, respectively. The seedling infection on susceptible variety showed black spots with blighted appearance lesions on primary leaf and histopathological test conducted on post-anthesis stage. The purpose of the investigation is to understand the survival of the pathogen in the absence of host and floral infection biology. Furthermore, this information is useful for integrated disease control measures in the future. © Akadémiai Kiadó Zrt. 2024.