Effects of High Temperature on Quality of Japonica Rice at Early and Middle Heading Stage under Different Planting Modes

With the intensified greenhouse effect, high temperature has gradually become an adverse factor in growth of rice. Transplanting (TP) and direct seeding (DS) are two common rice planting modes. At present, response quality to under different modes at stages have not yet be identified. Therefore, our study, high-quality japonica Nanjing 9108 (NJ9108) 46 (NJ46) were cultivated through TP DS setting normal (NT), moderate heating (2 °C higher than NT, MT) extreme (5 HT) early heading stage (EH, 0–14 d after heading) middle (MH, 15–28 respectively. The results showed that better resistance was achieved with TP. head rate, gel consistency amylose content decreased increase temperature, while chalkiness degree, setback viscosity, average particle size, crystallinity gelatinization opposite. Compared MH, effect EH on more significant. In terms varieties, stronger for NJ46 relative NJ9108, mainly because a longer period can avoid stress stage. Above all, suggest could background climate warming.