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        Temperature Effect on the Growth Parameters of Rice (Oryza sativa L.) during Vegetative Growth Period

        Yin Myat Myat Min,양서영,이현석,이정건,최명규,황운하 경상국립대학교 농업생명과학연구원 2023 농업생명과학연구 Vol.57 No.1

        Temperature is a crucial environmental factor for rice cultivation due to the climate change and can influence the rice growth anddevelopment. Therefore, the effect of temperature on plant growth characters was examined during the vegetative growth stage. Plantswere 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 stronglyaffected 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°Cand 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 stemdry weight was significantly increased in 18°C. Nitrogen content was increased in the leaves of 18°C whereas available phosphate andpotassium contents was found to be increased in the stems of 21°C and 24°C. OsNRT2.1 was overexpressed in the leaves and stemsof 18°C and OsNRT2.3a could be expressed in 18°C and 21°C temperatures whereas more expressed in 21°C. OsPT1 and OsPT6 couldbe 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 overexpressedin 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 genecould expressed more in the stem of 24°C.

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