Exogenous Melatonin Improves the Quality Performance of Rice under High Temperature during Grain Filling

With the increasing greenhouse effect, high temperature has become most unfavorable environmental factor for rice grain filling process, affecting yield and quality mainly through changing composition structure of starch in grains. Research focused on rational management water fertilizer, spraying exogenous chemicals, which have important measures to alleviate stress rice. As a multifunctional molecule, melatonin potential improve plant resistance by enhancing scavenging efficiency reactive oxygen species (ROS), thus protecting plants from adverse effects abiotic stress. The present study used typical japonica variety Nipponbare (NPB) as experimental material, was treated with during grain-filling stages. growth traits, well synthesis, response were analyzed systematically. Exogenous significantly increased leaf photosynthetic heat-resistance properties. Melatonin could key physicochemical properties related quality. Furthermore, milled NPB had better endosperm appearance under temperature. Further found that stabilize chain length distribution (especially amylopectin), implied be cultivation effect quality, optimization amylopectin synthesis can also results provide new idea research direction context global warming.