1406-65-1 142M471B3J Carbon Dioxide Chlorophyll Journal Article Photosystem II Protein Complex Research Support, Non-U.S. Gov't 2R958OYG8P Antioxidants Barley Ca(2+) Mg(2+)-ATPase Calcium Compounds Chlorates Chlorophyll fluorescence EC 3.6.1.- EC 6.3.1.2 Glutamate-Ammonia Ligase Glutamine synthetase Light-Harvesting Protein Complexes Non-photochemical quenching Photoinhibition Photorespiration Photosystem I Protein Complex Plant Proteins Reactive Oxygen Species calcium chlorate