Ethiopia Advances Climate-Resilient Agriculture with New Early-Maturing Orange-Fleshed Sweetpotato Variety

2026-07-12 06:28:32 Environment

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Ethiopian agricultural researchers have identified a promising new orange-fleshed sweetpotato (OFSP) genotype that could significantly improve food and nutrition security in drought-prone regions of the country. The newly evaluated genotype, known as G3 (13NC9350A-9-3), demonstrated exceptional performance in yield, nutritional quality, disease resistance, and early maturity during a two-year national variety trial conducted across multiple agro-ecological zones in Ethiopia.

The study, conducted during the 2021 and 2022 main cropping seasons, evaluated ten orange-fleshed sweetpotato genotypes at Hawassa, Arbaminch, and Koka research sites in Sidama, South Ethiopia, and Oromia regions. Researchers aimed to identify early-maturing and high-yielding varieties capable of thriving under erratic rainfall conditions that increasingly affect agricultural productivity across the country.

Sweetpotato is one of Ethiopia’s most important root crops and plays a critical role in supporting food systems in vulnerable rural communities. Orange-fleshed sweetpotato varieties are particularly valuable because they are rich in beta-carotene, a precursor of vitamin A, which helps combat vitamin A deficiency — a major public health challenge in many developing countries.

According to the study findings, genotype G3 consistently outperformed all other tested varieties across all environments. It recorded an average root yield of 36.2 tons per hectare, representing a 41.4 percent yield advantage over the widely cultivated standard check variety, Alamura. Researchers also found that G3 matured within only three to four months, making it especially suitable for lowland areas where rainfall is short and unpredictable.

The significance of early maturity cannot be overstated in regions experiencing climate-induced drought and moisture stress. Early-bulking varieties allow farmers to harvest before severe dry periods occur, reducing the risk of crop failure and improving food availability during vulnerable seasons. Additionally, early harvesting enables farmers to integrate sweetpotato into relay and double-cropping systems, enhancing land productivity and crop diversification.

The research highlighted that environmental variability strongly influenced sweetpotato performance, reinforcing the need for climate-resilient and adaptable varieties. Statistical analysis revealed highly significant differences among genotypes and locations for root yield and related traits, indicating the importance of selecting varieties specifically suited for diverse growing conditions.

To further evaluate adaptability and stability, researchers employed Genotype plus Genotype-by-Environment Interaction (GGE) biplot analysis. The graphical analysis showed that G3 was the “vertex genotype,” meaning it performed best across nearly all test environments over both years. The genotype demonstrated broad adaptation and stable performance despite varying rainfall conditions and environmental stresses.

Beyond yield performance, G3 also exhibited favorable nutritional and agronomic traits. The genotype contained approximately 5.5 mg of beta-carotene per 100 grams of fresh root, meeting acceptable nutritional standards for orange-fleshed sweetpotato varieties. It also maintained a dry matter content of 30 percent, a desirable level associated with better texture and consumer acceptance in East African markets.

Researchers additionally observed that G3 showed strong resistance to Sweetpotato Virus Disease (SPVD), one of the most destructive diseases affecting sweetpotato production worldwide. The genotype recorded a low disease severity score of 1.39 on a 1–9 scale, placing it within the resistant category. SPVD can cause devastating yield losses ranging from 50 to 100 percent under severe infestations, making disease resistance a critical breeding objective.

Another notable characteristic of G3 was its profuse flowering ability. Unlike many sweetpotato genotypes that flower poorly under Ethiopian conditions, G3 exhibited nearly 95 percent flowering potential. This trait is particularly valuable for breeding programs because it allows researchers to use the genotype as a parent in future hybridization efforts aimed at developing even more resilient and nutritious varieties.

The study also underscored the broader role of biofortified crops in addressing malnutrition and strengthening food systems. Orange-fleshed sweetpotatoes are increasingly promoted across Sub-Saharan Africa as a cost-effective and sustainable strategy to improve dietary diversity and reduce micronutrient deficiencies, particularly among children and women.

As climate change continues to intensify drought frequency and rainfall irregularity, researchers emphasize the urgent need for crop varieties that combine resilience, nutrition, and productivity. Ethiopia’s investment in developing improved sweetpotato varieties aligns with global efforts to strengthen climate-smart agriculture and enhance food security for smallholder farmers.

Based on the overall performance observed during the national variety trials, the researchers recommended genotype G3 for official verification and release for cultivation in mid- to lowland areas of Ethiopia. Its combination of early maturity, high yield potential, nutritional quality, disease resistance, and environmental adaptability positions it as a strong candidate for wider dissemination among farmers facing increasingly challenging growing conditions.

References:
Wube, BililignMekonnen, and Melese Lema Tesema. 2026. “Trait Associations and Genetic Parameters in Purple-Fleshed Sweetpotato Genotypes Evaluated at Hawassa, Sidama Regional State, Ethiopia ”. Asian Journal of Research and Review in Agriculture 8 (1):8-18. https://doi.org/10.56557/ajrra/2026/v8i1191

Mekonnen B, Gurmu F. Evaluation of the performance and stability of early maturing orange-fleshed sweetpotato genotypes in selected areas in Ethiopia. PLoS One. 2024 Oct 25;19(10):e0310273. doi: 10.1371/journal.pone.0310273. PMID: 39453954; PMCID: PMC11508074.