Seed Vigour Test of Sweet Corn (Zea mays L. var. sacharata L.)

Abstract

                Sweet corn seeds were treated with hot air dry at 70^oC for 1 or 3 days, and the vigour of the treated seeds was evaluated. When the seeds were allowed to germinate on moistened rolled sheets of paper towels, the heat treated seeds showed more rapid water absorption than the control seeds. β-amylase activity in seeds during imbibition decreased with increase in the duration of heat treatment at 70 ^oC. The seeds were soaked for 40 hours and leachate from seeds was tested for electrical conducitvity (EC), and for protein, amino acids, sugars, potassium and magnesium contents. EC and content in seed leachate increased with increasing temperature and duration of heat treatment on the seeds. seed leakage was negatively correlated with emegence of the seedling in field tests.

                 After heat treatment at 70^oC for 1 day, the seeds were sealed in tin cans and kept in cold room (10 ^oC, 55 % RH) and their storability was evalutated. Percent germination in the laboratory, seedling height and seedling leaf area in the field were not significantly different between heat treated and non - heated seeds through 12 months of storage. Seedling emergence and dry weight in field test were significantly different between treated and the control seeds after they were stored for 12 month, while EC was significantly different as soon as the storage was initiated. In conclusion EC and composition of the seed leachte were sensitive indicators to determine the rate of deterioration and the vigour of sweet corn seeds.