Volume 36, Number 2
 
 
 
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Science, Technology and Development Vol. 36 (2), 2017
Research Article
Effect of Various Temperatures and Duration on Deterioration of Rice Seeds
Ashtar Khan, Majid Ali, Sadar Uddin Siddiqui, Shakeel Ahmad Jatoi, Sohail Ahmad Jan, Nadar Khan and Abdul Ghafoor
 
Abstract: Temperature is one of the most important abiotic stresses that affect both morphological and physiological characters of many rice genotypes. The present study was conducted to evaluate seed aging potential of ten important rice varieties, namely, PARC 336, PARC 337, PARC 338, PARC 339, PARC 340, PARC 341, PARC 342, PARC 343 PARC 344, 345 PARC 346 and PARC 347, for seed deterioration study at different temperatures (25, 35 and 45 °C) and for different time periods (36, 72 and 96 hours). Various physiological parameters, such as, germination percentage, shoot/root lengths, shoot/root dry weights, were significantly affected by temperature stress. The germination response of genotype PARC 339 was the maximum and was found to be significantly different from other tested genotypes. The shoot length was higher in genotype PARC 341, at high temperature (45 °C) for 96 hours, while the root length was maximum of genotype PARC 337 at all temperature as compared to others. Similarly the shoot/root dry weights were significantly different at all temperature and time periods in all tested genotypes. The present study might serve as a model to screen temperature tolerant rice lines at different time periods.
 
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