Genetic variability studies of Valencia groundnut varieties for late leaf spot (Phaeoisariopsis personata) resistance

Wambi, Wilber; Tukamuhabwa, P.; Tirumalaraju, Sivananda Varma; Okello, David Kalule; Deom, C. M.; Bravo‐Ureta, Boris E.; Puppala, Naveen

doi:10.5897/ajps2015.1299

Cited by 4 publications

(1 citation statement)

References 18 publications

(19 reference statements)

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“…The National Semi Arid Resources Research Institute (NaSARRI) in Soroti, which is part of Uganda's National Agricultural Research Organization (NARO), has released a number of HYVs over recent years through collaborative efforts between domestic and international geneticists and plant breeders [63][64][65]. Yet, in 2002, 90% of all crops in Uganda, including groundnuts, consisted of landrace varieties (LRVs) from home-saved seed, and by 2014, this share remained between 85% and 90% [66,67].…”

Section: Groundnut In Ugandamentioning

confidence: 99%

Adoption of High-Yielding Groundnut Varieties: The Sustainability of a Farmer-Led Multiplication-Dissemination Program in Eastern Uganda

et al. 2018

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This study examines the adoption of high-yielding varieties (HYVs) of groundnut by smallholders in eastern Uganda. The primary focus of this work is the analysis of the sustainability of impacts from a regional farmer-led HYV dissemination and multiplication program. Data collected in 2014 is used to determine the lasting impact of the program conducted a decade prior, from 2001 to 2004. The structure of the data, which includes a treatment and 2-part control group, is critical to the identification of project impacts, measured as groundnut land allocation to groundnut HYVs (%). Fractional regression, propensity score matching and instrumental variable techniques are utilized to address potential bias from model specification, selection, and endogeneity. We find that, on average, participating households allocated 21% more of their land in groundnuts to HYVs relative to controls. Diffusion of program benefits through spillover is revealed by statistically significant differences in mean adoption between neighbor and non-neighbor controls, such that benefits are transferred from participants to their neighbors but not to the non-neighbor control group. We also find that, because of seed saving practices, the average yield for HYVs decreased over time to levels below those obtained from landrace varieties. Thus, the program effectively aided in information dissemination and technology transfer within rural communities. However, additional knowledge transfer is critical to the sustainability of food security outcomes among participant farmers.

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Section: Groundnut In Ugandamentioning

confidence: 99%

Adoption of High-Yielding Groundnut Varieties: The Sustainability of a Farmer-Led Multiplication-Dissemination Program in Eastern Uganda

et al. 2018

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SSR markers associated to early leaf spot disease resistance through selective genotyping and single marker analysis in groundnut ( Arachis hypogaea L.)

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et al. 2017

Biotechnology Reports

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Variability and Trait Association Studies for Late Leaf Spot Resistance in a Groundnut MAGIC Population

et al. 2021

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Globally, late leaf spot (LLS), a foliar fungal disease is one of the most important biotic constraint in groundnut production. Multi-Parent Advanced Generation Inter Cross (MAGIC) groundnut population was developed in a convergent crossing scheme using eight founder parents to develop a mapping population for multiple traits includes LLS. The experiments conducted in light chamber using detached leaf assay, and disease field screening nurseries at two locations (ICRISAT and ARS, Kasbe Digraj) showed significant variability for LLS resistance and component of resistance traits. Total 10 MAGIC lines with longer incubation (>11.0 days) and two MAGIC lines with longer latent period (>27 days) than the resistant parent, GPBD 4 were identified. The MAGIC lines, ICGR 171413, and ICGR 171443 with a lesion diameter of <1 mm and 4.10–5.67% of leaf area damage can be valuable sources for the alleles limiting the pathogen severity. A total of 20 MAGIC lines recorded significantly superior for disease score at 105 DAP_I (5.60–6.89) compared to resistant check, GPDB 4 (6.89). Further studies to determine the type and number of genes controlling the LLS component traits in groundnut will be useful for improvement of resistance to LLS. Genomic selection approach can be valuable in groundnut breeding to harness the minor alleles contributing to the component traits of LLS resistance.

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Genetic variability studies of Valencia groundnut varieties for late leaf spot (Phaeoisariopsis personata) resistance

Cited by 4 publications

References 18 publications

Adoption of High-Yielding Groundnut Varieties: The Sustainability of a Farmer-Led Multiplication-Dissemination Program in Eastern Uganda

Adoption of High-Yielding Groundnut Varieties: The Sustainability of a Farmer-Led Multiplication-Dissemination Program in Eastern Uganda

SSR markers associated to early leaf spot disease resistance through selective genotyping and single marker analysis in groundnut ( Arachis hypogaea L.)

Variability and Trait Association Studies for Late Leaf Spot Resistance in a Groundnut MAGIC Population

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