Metabolic profiling for dissection of late leaf spot disease resistance mechanism in groundnut.

Autor: Mahatma MK; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India., Thawait LK; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India., Jadon KS; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India.; ICAR-Central Arid Zone Research Institute, Jodhpur, India., Thirumalaisamy PP; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India., Bishi SK; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India.; ICAR-Indian Institute of Agricultural Biotechnology, Ranchi, India., Rathod KJ; Food Testing Laboratory, Department of Biotechnology, Junagadh Agricultural University, Junagadh, 362 001 India., Verma A; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India., Kumar N; ICAR-Directorate of Groundnut Research, Post Box No.5, Junagadh, 362001 Gujarat India., Golakiya BA; Food Testing Laboratory, Department of Biotechnology, Junagadh Agricultural University, Junagadh, 362 001 India.
Jazyk: angličtina
Zdroj: Physiology and molecular biology of plants : an international journal of functional plant biology [Physiol Mol Biol Plants] 2021 May; Vol. 27 (5), pp. 1027-1041. Date of Electronic Publication: 2021 May 12.
DOI: 10.1007/s12298-021-00985-5
Abstrakt: Late leaf spot (LLS) caused by fungi Passalora personata is generally more destructive and difficult to control than early leaf spot. The aim of this study was to decipher biochemical defense mechanism in groundnut genotypes against P. personata by identifying resistance specific biomarkers and metabolic pathways induced during host-pathogen interaction. Metabolomics of non-infected and infected leaves of moderately resistant (GPBD4 and ICGV86590), resistant (KDG128 and RHRG06083) and susceptible (GG20, JL24 and TMV2) genotypes was carried out at 5 days after infection (65 days after sowing). Non-targeted metabolite analysis using GC-MS revealed total 77 metabolites including carbohydrates, sugar alcohols, amino acids, fatty acids, polyamines, phenolics, terpenes and sterols. Variable importance in projection (VIP) measure of partial least squares-discriminant analysis (PLS-DA) showed that resistant and moderately resistant genotypes possessed higher intensities of ribonic acid, cinnamic acid, malic acid, squalene, xylulose, galactose, fructose, glucose, β-amyrin and hydroquinone while susceptible genotypes had higher amount of gluconic acid 2-methoxime, ribo-hexose-3-ulose and gluconic acid. Heat map analysis showed that resistant genotypes had higher intensities of β-amyrin, hydroquinone in non-infected and malic acid, squalene, putrescine and 2,3,4-trihydroxybutyric acid in infected leaves. Dendrogram analysis further separated resistant genotypes in the same cluster along with infected moderately resistant genotypes. The most significant pathways identified are: linoleic acid metabolism, flavone and flavonol biosynthesis, cutin, suberin and wax biosynthesis, pentose and glucuronate interconversions, starch and sucrose metabolism, stilbenoid biosynthesis and ascorbate and aldarate metabolism. Targeted metabolite analysis further confirmed that resistant genotypes possessed higher content of primary metabolites sucrose, glucose, fructose, malic acid and citric acid. Moreover, resistant genotypes possessed higher content of salicylic, coumaric, ferulic, cinnamic, gallic acid (phenolic acids) and kaempferol, quercetin and catechin (flavonols). Thus metabolites having higher accumulation in resistant genotypes can be used as biomarkers for screening of LSS resistant germplasm. These results unravel that higher amount of primary metabolites leads to stimulate the accumulation of more amounts of secondary metabolites such as phenolic acid, flavanols, stilbenes and terpenoids (squalene and β-amyrin) biosynthesis which are ultimately involved in defense mechanism against LLS pathogen.
Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-021-00985-5.
Competing Interests: Conflicts of interestThe authors declare that there is no conflict of interest.
(© Prof. H.S. Srivastava Foundation for Science and Society 2021.)
Databáze: MEDLINE
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