تاثير دما بر مولفه هاي جوانه زني ارقام كلزا

Effect of Temperature on Germination Components in Canola Cultivars

Early, fast and uniform seed germination results in favorable emergence and greater early vigor, which in turn leads to more radiation interception and higher yield. The aim in this research was to investigate the response of germination components of canola to suboptimal temperatures. Days to beginning of germination, final germination percentage, and germination rate and uniformity were considered as components of germination. The experimental design was a factorial one with two factors, nine canola genotypes (from Germany, France and Canada) as well as four temperatures (4.5, 10, 15 and 20°C). The results indicated that temperature and genotype had significant effect on all components of germination. The temperature x genotype interaction was significant for all components except for maximum germination. Temperature lower than 15 °C decreased final germination percentage as well as germination uniformity, while temperature lower than 20 °C delayed time to beginning of germination. Temperature drop especially from 10 to 4.5 °C delayed time to beginning of germination trifold. The base and optimal temperatures for germination were found to be 0 to 4 °C and 16 to 30 °C respectively. It was concluded that it is possible to use the genotypic differences found in this research to improve the components of germination under suboptimal temperatures and it is also possible to improve the base and optimal temperatures in canola.