Effects of seed coating substances on chemical and bio-chemical properties of rice seeds cv. KDML 105
2009
Thobunluepop, P. | Pawelzik, E. | Vearasilp, S.
Fungicides may cause phytoxicity induced seed deterioration. Thereafter, during storage, a number of biochemical and physiological changes occur. Loss of viability is associated with disturbances of the cell membranes, nutrient losses and losses of enzyme activities. This study sought to investigate the effects of various seed coating substances; chemical fungicide(Captan;CA), and biological fungicide polymers [chitosan-lignosulphonate polymer CCL] and eugenol incorporated into chitosan-lignosulphonate polymer(EtCL) on chemical and biochemical properties of rice seeds CVI KDML105, which have been stored for 12 months. CA significantly affected the rice seed viability and the associated deterioration. Total protein content decreased accompanied by decline of lipid content, increase of free fatty acids and activation of hipoxygenase enzyme. In the case of biological fungicide coated seeds the antioxudative scavenging enzymes were ascorbate peroxidase and superoxide dismustase and a high antioxidant activity protected them. The biological coated seeds were found to maintain high sugar contents inside the seeds which resulted in high seed storability significantly. In contrast, under fungicide stress(CA), those compounds were lost that directly affected seed vigor during seed storage. This results suggest that sucrose may serve as the principal agent for stress tolerance in the seeds, whereby the larger oligosaccharides serve to keep sucrose from crystallizing. The application of biological seed coating substances by CL and EtCL may be a promising strategy to improve the direct-seed rice production system.
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