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Involvement of phenolics, flavonoids and phenolic acids in high yield characteristics of rice (Oryza sativa L.)

100%

Xuan T. D. , Bach D. T. , Dat T. D.

International Letters of Natural Sciences

2018

tom 68

The present study examined the correlation between phenolic acids and flavonoids with high and low yield traits of rice. It was observed that the difference of phenolic contents among the tested rice lines occurred only at the vegetative stage. The concentrations of phenolic acids were higher in the high yield cultivars than low yield varieties at the vegetative stage, but they either decreased dramatically or disappeared during the development stage. Caffeic acid was found only in high yield, whereas chlorogenic acid was detected only in low yield rice. Sinapic acid was the dominant phenolic acid in high yield cultivars at vegetative stage (3.7 mg/g), followed by ferulic acid (1.2 mg/g). These findings suggested that caffeic acid, ferulic acid, sinapic acid and chlorogenic acid may play a particular role in forming yield components in rice. The cultivar B3 contained high amount of sinapic acid may be used as a natural source for pharmaceutical use.

Involvement of phenolic compounds in anaerobic flooding germination of rice (Oryza sativa L.)

63%

Khang D. T. , Ha P. T. T. , Lang N. T. , Tuyen P. T. , Minh L. T. , Minh T. N. , Bach D. T. , Xuan T. D.

International Letters of Natural Sciences

2016

tom 56

By this study, thirty rice varieties were evaluated for anaerobic flooding tolerance using the direct sowing method. Phenolic profiles of strong and weak tolerant varieties were identified and compared based on HPLC chromatograms. The germination rates and shoot heights of rice were recorded for calculating the seedling vigor, which indicate the tolerant ability of rice in flooding condition. The results revealed a high variation of germination rate (10.01 to 100%), shoot height (0.35 to 78.17 mm) and seedling vigor (0.05 to 72.83). There was a high correlation between (r = 0.71) germination rate in 5 cm and 10 cm flood. Phenolic and flavonoid contents of the strong tolerant cultivar significantly and proportionally increased in the flooding levels (5 cm and 10 cm). There was a total difference in terms of number of phenolic acids found in the strong and weak tolerant varieties. In particular, six phenolic acids (gallic acid, catechol, caffeic acid, syringic acid, vanillin, and ellagic acid) were only identified with high concentration in the strong tolerant cultivar. The findings suggest that the phenolics presented in the strong tolerant varieties probably have a certain function in response and adaptation to anaerobic flooding condition. Further researches on exogenous application of these phenolic acids to increase the flooding tolerant level of rice should be continued at both green house and field treatments.