Effect of two‐week heat stress during grain filling on stem reserves, senescence, and grain yield of European winter wheat cultivars

• DOI: 10.1111/jac.12410
• Publication Date: 2020-04-23T02:39:31Z
• Authors: Siegfried Schitte...; Tina Langkamp‐Wedde; Martin Kraft; Lorenz Kottmann; Katja Matschiner
• Keywords: Anthesis

Abstract To examine the extent to which heat stress during grain filling impacts on development and yield of winter wheat ( Triticum aestivum L.), a 3‐year field experiment was conducted loess soil with high water holding capacity in North German Plain. Thirty‐two mostly European cultivars were exposed mobile foil tunnel maximum air temperatures 45.7, 45.4, 47.2°C 2015, 2016, 2017, respectively. The 14‐day post‐anthesis treatment caused an average 57.3% reduction compared close‐by non‐stressed control. proportion green crop area after phase varied from 7% 98% 2016 37% 94% 2017. percentage did not significantly correlate yield, indicating that delayed senescence stay‐green phenotypes offers no advantage under terminal stress. soluble carbohydrate (WSC) concentration stems at maturity between 6 92 g/kg dry matter, showing genotypes differed their efficiency using stem reserves for WSC correlated positively beginning anthesis r = 0.704; p < .001) but negatively −0.431; .05). For tolerance breeding, reserve strategy, i. e. rapid full exhaustion temporary storage therefore seems more promising than strategy.