Bhadragiri, H B and Mallikarjuna, N and Sharma, S and Sudini, H K and Veerendrakumar, H V and Muluguri, S and Mangala, U N and Janila, P and Singh, K and Ramachandran, S and Mayes, S and Pandey, M K (2025) Exploring Novel Sources of Resistance to Late Leaf Spot in Groundnut (Arachis hypogaea L.). In: Advances in Arachis through Genomics and Biotechnology (AAGB-2025), 23-25 March 2025, Novotel, Goa, India.
Full text not available from this repository. (Request a copy)Abstract
Peanut (Arachis hypogaea L.), commonly known as groundnut, is a significant oilseed crop cultivated in over 100 countries worldwide. Late leaf spot (LLS) is a severe disease affecting groundnut, leading to yield losses of up to 50%. Development of resistant varieties is considered a preferred strategy to manage LLS due to its cost-effectiveness and reduced environmental damage compared to other control methods. To date, GPBD 4, derived from Arachis cardenasii, is the sole source of resistance against LLS globally, serving as a basis for developing disease-resistant or tolerant varieties. However, encouragingly, other wild species have been identified with high resistance. Introgression lines, developed from synthetic crosses with these wild species (A. kempffmercadoi, A. hoehnei, A. duranensis, A. batizocoi and A. ipaensis) have shown a disease score of 2, outperforming GPBD 4. SNP-based allele mining of these introgression lines, using markers from GPBD 4 for LLS resistance (Chr13_142435734 (C/T), Chr13_144038674 (T/C), Chr13_143296024 (AG/A)) which encode for the proteins receptor like protein 29 and Pentatricopeptide repeat-containing protein revealed the absence of those alleles, suggesting the presence of additional significant alleles for resistance from the wild species. Identifying the genes responsible for resistance present in these new sources is critical. A total of 705 introgression lines, developed through backcrossing (ICGV91114 × ISATGR 121250, ICGV87846 × ISATGR 265-5A, ICGV87846 × ISATGR-278-18, TMV2 × ISATGR 121250) and advanced to BC2F10 and BC2F7, were screened for resistance, and the best-performing lines, superior to GPBD 4, were selected during rainy 2024. These best performing ILs will again phenotype during rainy 2025 for trait confirmation, followed by making these available to global research community.
| Item Type: | Conference or Workshop Item (Poster) |
|---|---|
| Divisions: | Center of Excellence in Genomics and Systems Biology Global Research Program - Accelerated Crop Improvement Genebank |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Introgression lines, Wild species, Back-crossing, Allele mining |
| Subjects: | Mandate crops > Groundnut Others > Plant Disease |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 09 Jul 2025 05:00 |
| Last Modified: | 09 Jul 2025 05:00 |
| URI: | http://oar.icrisat.org/id/eprint/13219 |
| Acknowledgement: | UNSPECIFIED |
| Links: | |
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