Chitosan-enhanced heat tolerance associated with alterations in antioxidant defense system and gene expression in creeping bentgrass
2023
Qiuguo Li | Yingjie Bian | Ruonan Li | Zhimin Yang | Nanqing Liu | Jingjin Yu
As an effective plant growth regulator, chitosan plays a positive role in enhancing heat tolerance in perennial turfgrass. The objective of this study was to elucidate whether chitosan-promoted thermotolerance was associated with the antioxidant defense system under long-term heat stress in creeping bentgrass (Agrostis stolonifera). Plants were treated with or without 100 mg∙L−1 chitosan under either heat stress (38/28 °C, day/night) or non-stressed condition (25/20 °C, day/night) for 42 d in growth chambers. Foliar application of chitosan significantly enhanced heat tolerance as reflected by the increased turf quality through inhibiting over-accumulation of reactive oxygen species, and increasing ascorbic acid content and antioxidant enzymes activities (peroxidase, POD; ascorbate peroxidase, APX; glutathione reductase, GR; dehydroascorbate reductase, DHAR). Chitosan-treated plants also had higher transcript levels of AsCu/ZnSOD, AsCATB, AsPerox4, AsAPX2, AsAPX3, AsAPX4, AsAPX6, AsAPX8, AsGR2, and AsDHAR genes in comparison to the untreated plants. The results suggested that chitosan-promotion in heat tolerance could be associated with non-enzymatic antioxidants, antioxidant enzymes, as well as relative gene expression.
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