ArticleJournal of the science of food and agriculture2026
Morpho-physiological and agronomic responses of wheat varieties under artificial shade in agroforestry systems.
Article in Journal of the science of food and agriculture, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSolar radiation is a primary constraint in silvoarable agroforestry, with yield losses near the trees well documented in temperate climates. However, genetic variability for shade tolerance remains largely unexplored. This 2-year field trial investigated the impact of artificial shading - using nets that reduced photosynthetically active radiation (PAR) by moderate (-30%) and severe (-50%) levels relative to full sun - on the morpho-physiology and yield of common wheat. During the first growing season, three varieties were evaluated: the modern variety, Bologna, and two old, tall varieties, Piave and Terminillo. In the second season, only Bologna was retested under the same shading treatments, to further assess its performance.
resultsShading treatments delayed crop phenology from heading onward. They were associated with a prolonged canopy stay-green, with effects accentuated by increasing shading severity. In the first year, moderate shading increased Bologna's grain yield by 8% (P ≤ 0.05) and raised protein content by 0.7%. In the second year, drier conditions and reduced radiation from March-June - causing more severe limitation of PAR, the amount of sunlight available for photosynthesis - led to a 40% yield loss. Old varieties suffered yield reductions due to lodging (-43% in Terminillo, -66% in Piave), yet showed notable increases in mineral content (up to +48% Mg in Piave) and grain protein (+1.7% in Terminillo and +3.4% in Piave). Under shaded conditions, increased gliadin content led to enhanced gluten accumulation, potentially improving dough extensibility.
conclusionsAlthough nets can mimic shading in wheat effectively, these results highlight the need to extend varietal screening to identify suitable genotypes and key morpho-physiological traits to optimize wheat cultivation in shaded environments such as agroforestry systems, with further validation in specific emerging models. © 2025 The Author(s). Journal of the Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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