Temperature is a crucial environmental factor for rice cultivation due to the climate change and can influence the rice growth and development. Therefore, the effect of temperature on plant growth characters was examined during the vegetative growth stage. Plants were grown under three different temperatures: 23°C/13°C for 18°C, 26°C/16°C for 21°C and 29°C/19°C for 24°C in the phytotron. The temperature was treated after transplanting and ended in early panicle initiation stage. Heading date of the two varieties were strongly affected by the temperature and were delayed in the 18°C. The plant height in the 18°C was 21 % shorter than the 21°C and 24°C and the tiller and leaf number were increased in the 18°C. All the growth rates of the characters were the slowest in 18°C. The stem dry weight was significantly increased in 18°C. Nitrogen content was increased in the leaves of 18°C whereas available phosphate and potassium contents was found to be increased in the stems of 21°C and 24°C. OsNRT2.1 was overexpressed in the leaves and stems of 18°C and OsNRT2.3a could be expressed in 18°C and 21°C temperatures whereas more expressed in 21°C. OsPT1 and OsPT6 could be expressed in the leaf of 18°C and 24°C but could be expressed more in the stem of 18°C. OsHAK1 and OsHAK5 could be overexpressed in the leaves and stems of 18°C. For hormone, OsCKX2 gene was found to be up regulated in the leaves of 18°C and OsIAA1 gene could expressed more in the stem of 24°C.

Abstract
Introduction
Materials and Methods
    1. Plant materials and temperature treatments
    2. Phenotypic character
    3. Dry matter production and plant nutrient uptake
    4. SPAD value and photosynthesis rate
    5. RNA extraction and gene expression
    6. Statistical analysis
Results and Discussion
    1. Plant growth characters and growth speed underdifferent temperatures
    2. Dry matter production and nutrient contents ofrice under different temperatures
    3. Photosynthesis activity and chlorophyll contentunder different temperatures
    4. Gene Expression of nutrient content and hormoneunder different temperatures
Acknowledgements
References

• Yin Myat Myat Min(Rice Research Center, Department of Agricultural Research, Yezin, Myanmar)
• Seo-Yeong Yang(National Institute of Crop Science (NICS), RDA)
• Hyeon-Seok Lee(National Institute of Crop Science (NICS), RDA)
• Chung-Gun Lee(National Institute of Crop Science (NICS), RDA)
• Myeong-Gue Choi(National Institute of Crop Science (NICS), RDA)
• Woon-Ha Hwang(National Institute of Crop Science (NICS), RDA) Corresponding author