ASSESSMENT OF COLD TOLERANCE IN RICE VARIETIES UNDER KARAKALPAKSTAN CONDITIONS
Keywords:
Rice, variety sample, low temperature, germination, tolerance, breeding.Abstract
This study evaluated the cold tolerance of rice variety samples under Karakalpakstan conditions in laboratory settings. Seeds were stored in a thermostat at +10 °C, and germination rates were determined as percentages after 10 and 15 days. According to the results, Sanam, D-15 (D-158), and Guliston varieties showed high tolerance in cold conditions (75– 86%), while D-4 (14-04-3) had the lowest indicator (54%). These results demonstrate that certain varieties possess stable germination capacity even under low temperature conditions, serving as an important resource in breeding processes for creating varieties adapted to cold climate conditions.
References
Yoshida, S. (1981). Fundamentals of rice crop science. International Rice Research Institute (IRRI), Philippines.
Blum, A. (1988). Plant breeding for stress environments. CRC Press, Boca Raton, FL.
Cruz, R. P. da, & Milach, S. C. K. (2004). Cold tolerance at the germination stage of rice: methods of evaluation and characterization of genotypes. Scientia Agricola, 61(1), 1–8.
Cruz, R. P. da, Milach, S. C. K., & Federizzi, L. C. (2006). Inheritance of rice cold tolerance at the germination stage. Genetics and Molecular Biology, 29(2), 314–320.
Andaya, V. C., & Mackill, D. J. (2003). Mapping of QTLs associated with cold tolerance during the vegetative stage in rice. Journal of Experimental Botany, 54(392), 2579–2585.
