Effect of Seed Coating with Biopolymer and Coumarin Derivative on Water Uptake and Germination of Sweet Corn Seed
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Abstract
A desired biopolymer composite for seed coating is eco-friendly without negative effect on seed germination. Seed imbibition is a critical process for successful germination. Therefore, an objective of this research was to investigate water uptake rates of sweet corn seed coated with composites of biopolymers and a new coumarin derivative which is fluorescent that could create seed identity to prevent counterfeit seed. The experiment was laid out in a completely randomized design (CRD) with four replications and six treatments of seed coating as follows: (1) uncoated seeds, (2) seeds coated with poly-γ-glutamic acid (PGA), (3) carboxymethyl cellulose (CMC), (4) commercial polymer (CSC), (5) PGA+CMC+coumarin (PAG+CMC+COU), and (6) CSC+COU. It was found that at the initial of imbibition of 24 hrs, water uptake rates of coated seeds with PGA, CMC and PGA+CMC+COU were not different from those of uncoated seeds while seeds coated with CSC and CSC+COU had the highest water uptake rate. At the imbibition of 66 hrs, when radicle is visible, uncoated seeds had the highest water uptake rate followed by seeds coated with PGA and CMC while seeds coated with CSC, PGA+CMC+COU and CSC+COU had the lowest water uptake rate. However, there were no differences in percentage of radicle emergence, germination and seedling dry weight of uncoated and coated sweet corn seeds with all treatments. The results indicated that the biopolymer and coumarin derivative can be used for seed coating of sweet corn seed and has no effect on seed germination.
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