Responses of photosystem II and antioxidative systems to high light and high temperature co-stress in wheat

Different responses of photosystem and antioxidant defense system to three environmental stresses in wheat seedlings

“…The accumulation of ROS can damage cell membranes and other macromolecules including photosynthetic pigments, proteins, lipids, and nucleic acids (Gill and Tuteja 2010). Our recent studies also showed that high light, drought, and salt stress resulted in the obvious ROS accumulation in wheat, maize, and Arabidopsis (Chen et al 2016a(Chen et al , 2017(Chen et al , 2018. To alleviate the toxic effects of ROS on photosystems under environmental stresses, photoprotection mechanisms are usually activated through the nonphotochemical quenching (NPQ), by which the excessive light energy absorbed by the pigmentbinding proteins is dissipated as heat (Niyogi 2000).…”

“…It is reported that the reaction center of PSII is the key site, where damage caused by various environmental stresses occurs in the photosynthetic apparatus of plants (Adir et al 2003, Murata et al 2007. Although our previous studies indicated that PSII proteins showed different changes under different environmental stresses in different plant species (Chen et al 2016a(Chen et al , 2017, it is still unknown how PSII proteins response to different environmental stresses in the same plants.…”

“…Salinity is another abiotic stress, which affects crop productivity, photosynthesis, stomatal closure, and causes oxidative stress (Flowers 2004, Chen et al 2018. Besides, high light often results in photoinhibition and decrease in photosynthetic activity (Powles 1984, Chen et al 2017. It is reported that the reaction center of PSII is the key site, where damage caused by various environmental stresses occurs in the photosynthetic apparatus of plants (Adir et al 2003, Murata et al 2007.…”

“…In addition, different plants also have developed enzymatic and nonenzymatic antioxidant system to alleviate oxidative stress resulting from environmental reasons (Mittler et al 2004). Many previous studies indicated that the activities of antioxidative enzymes and nonenzymatic antioxidants showed different changes in different plants under environmental stresses (Chen et al 2016a(Chen et al , 2017(Chen et al , 2018. Therefore, it is very important to investigate the different responses of the antioxidant system to different environmental stresses in the same plant.…”

Wheat Oxygen Evolving Enhancer Protein: Identification and Characterization of Mn-Binding Metalloprotein of Photosynthetic Pathway Involved in Regulating Photosytem II Integrity and Network of Antioxidant Enzymes under Heat Stress

“…Farooq et al, (2011) also reported decrease in the photosynthetic capacity of the plant under HS. Kumar et al, (2016) and Chen et al, (2017) recently reported the decrease in photosynthetic rate in wheat in response to heat stress and they also correlated it with activity of various antioxidant enzymes.…”