Effects of chemical and physical treatments on germination of wheat (Triticum aestivum) seed
1996
Taillefer, L. | Nkongolo, K. (Laurentian University, Sudbury, Ontario (Canada). Department of Biological Sciences)
Freshly-harvested wheat (Triticum aestivum) seed exhibit post-harvest dormancy which is essentially lost following three to eight weeks storage at room temperature. The effects of mechanical scarification, gibberellic acid, humic acid, high and low temperatures on the germination of freshly-harvested (dormant) wheat (T. aestivum) seeds were evaluated. The experiments were conducted in a randomized complete block design with four replicates per treatment. Mechanical scarification and cold treatment were the most efficient method of breaking post-harvest dormancy by improving the germination rate from 23 percent to over 95 percent six days after germination. This was followed by the Gibberellic acid. Humic acid had no significant effect on the germination of seed of all the cultivars tested. The effect of heat treatment at 45 degrees C varied from one cultivar to another. The optimum temperature for germination of after-ripened seeds which have lost their dormancy during storage was about 25 degrees C. Comparison of different temperature regimes showed a steady decrease of germination of these seeds with the increase of temperature from 25 to 30, 35, 40 and 45 degrees C. Their germination was completely inhibited at 45 degrees C
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