Effect of temperature during grain filling stage on some grain quality characteristics of rice under different local climates in Mazandaran province

Grain quality (GQ) in rice is one of the most important factors in the pricing and marketability by consumers. Development and production of rice cultivars with high GQ is also important in the breeding programs. GQ is highly affected by genetic and environmental factors such as temperature (T, °C). Therefore, this study aimed to investigate the effect of different local climates on GQ of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GQ with average air temperatures (AAT) during the reproductive stage of rice (from anthesis stage (50% of flowers opened) to harvesting time) at the paddy fields of Babolsar, Amol and Polesefid cities in Mazandaran province.
Three field experiments were conducted separately based on the randomized complete blocks design with four replications, in the paddy fields of Babolsar (–21 m under sea level, asl), Amol ( m asl) and Polesefid ( m asl) cities in northern Iran in 2014. All agronomic managements were done based on local recommendations in each region. Moreover, all studied traits were measured in the grain quality laboratory at Rice Research Institute of Iran, Deputy of Mazandaran (Amol) three months after harvesting.
The results indicate that the effects of different local climates were statistically significant on the content of amylose, protein, gelatinization temperature, gel consistency and, grain length and width after cooking (P based on our findings in this study, GQ variation depended to T can simply be quantified in both cultivars (‘Tarom Hashemi’ and ‘Shiroudi’) under different local climates conditions of Mazandaran.