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Interactive effects of irrigation and nitrogen regimes on Rhopalosiphum padi demography in drought-tolerant and drought-sensitive barley cultivars | ||
| Iran Agricultural Research | ||
| دوره 45، شماره 2، 2026، صفحه 36-51 اصل مقاله (2.01 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/iar.2026.55727.1742 | ||
| نویسندگان | ||
| Maryam Aleosfoor* 1؛ Khatereh Zohrabi dehdezi1؛ Lida Fekrat2؛ Aurang Kavousi3 | ||
| 1Department of Plant Protection, School of Agriculture, Shiraz University, Shiraz, I. R. Iran | ||
| 2Department of Plant Protection, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, I. R. Iran | ||
| 3Department of Plant Protection, Faculty of Agriculture, University of Zanjan, Zanjan, I. R. Iran | ||
| چکیده | ||
| Sustainable control of cereal aphids under climate change requires a mechanistic understanding of how water and nutrient management interact with host drought tolerance to shape pest demography. The oat leaf aphid, Rhopalosiphum padi L., is a persistent constraint in cereal systems, yet its responses to combined abiotic and nutritional stress remain unclear. We evaluated irrigation and nitrogen effects on aphid life history across two barley cultivars differing in drought sensitivity. Plants were grown under three soil moisture levels (100%, 75%, and 50% field capacity) and three nitrogen rates (0, 75, and 150 mg N kg⁻¹ soil), and aphid demographic parameters were quantified using the age–stage, two-sex life table. The design quantified non-linear interactions among host drought tolerance, water availability, and nitrogen supply. The drought-tolerant cultivar 'Sararood' constrained aphid development and reproduction, particularly under water deficit, resulting in prolonged development and reduced intrinsic rates of increase (r), from 0.2272 d⁻¹ on 'Afzal' under optimal irrigation to 0.0090 d⁻¹ on 'Sararood' under severe water stress. In contrast, aphids on the drought-sensitive cultivar 'Afzal' showed rapid population growth under full irrigation but showed collapse under drought. Nitrogen effects were context-dependent and interacted with both moisture regime and cultivar physiology; while nitrogen fertilization had negligible effects on developmental duration, it reduced the intrinsic rate of increase under severe drought in 'Afzal'. Notably, moderate irrigation combined with moderate nitrogen on 'Sararood' minimized aphid population growth, a resource-efficient regime. These results highlight co-optimization of cultivar choice with precision irrigation and fertilization as a climate-smart integrated pest management (IPM) strategy. | ||
| کلیدواژهها | ||
| Host plant resistance cultivar؛ Pest demography؛ Oat leaf aphid؛ Water stress | ||
| مراجع | ||
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