Magnesium deficiency decreases biomass water-use efficiency and increases leaf water-use efficiency and oxidative stress in barley plants
作者： Merle Tränkner , Bálint Jákli , Ershad Tavakol , Christoph-Martin Geilfus , Ismail Cakmak
DOI: 10.1007/S11104-016-2886-1
关键词:
摘要: In water-scarce agro-environments a clear understanding of how plant nutrients like magnesium (Mg) affect traits related to water-use efficiency (WUE) is great importance. Magnesium plays crucial role in photosynthesis and thus major determinant biomass formation. This study investigated the effect Mg deficiency on leaf whole efficiency, δ13C composition, hydrogen peroxide (H2O2) production activity key enzymes involved ROS scavenging barley. Barley (Hordeum vulgare) was grown hydroponic culture under three different levels supply (0.01, 0.1, 0.4 mM Mg). WUE determined leaf-level (leaf-WUE), biomass-level (biomass-WUE) via carbon isotope discrimination (δ13C). Additionally, concentrations Mg, chlorophyll H2O2, activities antioxidative (ascorbate peroxidase, glutathione reductase superoxide dismutase) youngest fully expanded leaves were analyzed. Dry matter significantly decreased (by 34 % compared control) deficient barley plants. also markedly reduced concentrations, but increased H2O2 (up 55 % enzymes. Severe biomass-WUE by 20 %, which not reflected regarding leaf-WUE. line with leaf-WUE data, against 13C (indicating time-integrated WUE) deficiency. oxidative stress indicating impairment gain biomass-WUE. Our suggests that primarily affected photosynthesis-related processes, might be dependent effects night-time transpiration, respiration or root exudation.
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