33 research outputs found
Influence of starch type on characteristics of porous 3Y-ZrO2 prepared from a direct consolidation casting method
Lignin Modified by Formic Acid on the PA6 Films: Evaluation on the Morphology and Degradation by UV Radiation
Effects of SiC on the Properties and Microstructures of Closed-Pore Al2O3-MgAl2O4 Refractory Aggregates
Genetic factors regulating zinc concentrations, in mice spleen and liver: Relationship with the H-2 complex
Effects of continuous versus pulsed drought stress on physiology and growth of wheat
Stallmann J, Schweiger R, Müller C. Effects of continuous versus pulsed drought stress on physiology and growth of wheat. Plant Biology. 2018;20(6):1005-1013.In the course of climate change, crop plants are exposed to both altered precipitation volumes and frequencies in many cultivation areas. Reduced water availability and longer periods without precipitation can lead to changes in plant physiology and productivity. In this greenhouse study, we investigated physiological responses, including maximum quantum yield of photosystem II (Fv /Fm ) and water use efficiency (WUE) as well as diverse productivity-related parameters, including grain yield per plant, to continuous (irrigated three times a week) versus pulsed (once a week) irrigation in spring wheat (Triticum aestivum L.). In both drought regimes, plants were exposed to four different irrigation volumes. Fv /Fm was not influenced by irrigation treatment but was significantly higher after 6 weeks of drought than after 2 weeks. WUE increased with decreasing irrigation volume and based on generative biomass; it was higher in continuously-watered compared to pulsed-watered plants that received a similar amount of water over the experiment. Infrequent irrigation led to a reduction in grain yield of up to 51%. This lower productivity was primarily caused by fewer tillers in pulsed-watered plants. Additionally, at low water volume the thousand grain weight (TGW) was lower in infrequently-compared to frequently-watered plants. In contrast, the number of grains per ear was higher in pulsed-watered plants. In conclusion, reduced irrigation frequency, next to a decrease in irrigation volume, negatively affects WUE and grain yield of spring wheat. These results might have important implications for irrigation scheduling and breeding programmes under a changing climate