Association Mapping of Agronomic Traits in Bread Wheat Under Late Drought and Non-Stressed Conditions
Journal of Crop Health, cilt.78, sa.5, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 78 Sayı: 5
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s10343-026-01450-7
- Dergi Adı: Journal of Crop Health
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Anahtar Kelimeler: <italic>Triticum aestivum</italic> L., Drought tolerance, Association mapping, SSR, iPBS, Yield stability
- Atatürk Üniversitesi Adresli: Evet
Özet
Late drought is a major constraint to wheat productivity and yield stability in semi-arid regions. This study investigated marker–trait associations (MTAs) for agronomic traits in 64 bread wheat genotypes evaluated under well-watered and late drought conditions during the 2011–2012 and 2012–2013 growing seasons in Erzurum, Türkiye. Genotypes were characterized by using 120 simple sequence repeat (SSR) markers and 34 inter-primer binding site (iPBS) primers. Association mapping was performed separately for each growing season and water regime using the corresponding phenotypic datasets and a mixed linear model incorporating population structure (K = 3) and kinship. Late drought reduced grain yield, biological yield, and 1000-kernel weight by approximately 36.0%, 24.6%, and 16.9%, respectively. At an adjusted P ≤ 0.05 based on 1000 permutations, 82 SSR markers were involved in 219 significant MTAs across the individual year × water-regime datasets, explaining 1.4–24.7% of the phenotypic variation. In on the other hand, only six iPBS markers showed significant and environment-specific associations. Notably, iPBS-2390 and iPBS-2392 were associated with 1000-kernel weight under late drought in 2011–2012, with each marker explaining 9.0% of the phenotypic variation. Collectively, these results demonstrate the broader utility of SSR markers for detecting agronomically relevant associations across contrasting environments, while iPBS markers provide complementary information on environment-specific variation. The identified MTAs represent potential molecular resources for improving drought adaptation and yield stability in bread wheat. Graphic abstract: (Figure presented.).