Effects of Seed Coating with GA3 and IAA on Different Cultivars of Hybrid American Marigold Seeds
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Abstract
The production of marigold seeds often faces the problem of uneven seed maturity, which results in inconsistent germination and seedling growth. Therefore, the objective of this experiment was to study the effect of appropriate concentrations of GA3 and IAA for seed coating of three cultivars of hybrid American marigold seeds on seed germination and seedling growth. The experiment was conducted using a completely randomized design (CRD) with four treatments as follows: uncoated seeds, seed coating with 0.5% IAA, seed coating with 0.5% GA3 and seed coating with 1.0% GA3. After coating, the seeds were dried to 7% moisture content, and then seed germination was tested in the laboratory using the top of paper method and peat moss medium in the greenhouse. The results showed that seed coating with GA3 concentrations of 0.5% and 1% on all three cultivars significantly increased the speed of germination and decreased the mean germination time compared to uncoated seeds under both laboratory and greenhouse conditions except one cultivar (MG01), which showed no significant difference with uncoated seed under greenhouse condition. However, coating the seeds of all three cultivars with GA3 at concentrations of 0.5% and 1.0% significantly enhanced seedling growth in terms of shoot length and growth rate under greenhouse conditions at 14 days after sowing compared with seedlings from uncoated seeds. Meanwhile, no significant differences were observed in the germination percentage of normal seedlings among all treatments of seed coating, including uncoated seeds, under either laboratory or greenhouse conditions.
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King Mongkut's Agricultural Journal
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