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Comparison of seed storage proteins between ordinary and purple pericarp rice (Oryza sativa L.)

Comparison of seed storage proteins between ordinary and purple pericarp rice (Oryza sativa L.)

Chinese Journal of Botany 5(1): 6-10

To understand higher nutritive value of purple pericarp rice (Oryza sativa L.) than that of ordinary rice, the seed storage proteins among four varieties of ordinary rice and nine varieties of purple pericarp rice were compared. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) showed that all varieties examined had very similar protein components, whose relative amounts were diverse based on the intensities of individual polypeptide band assessed by the densitometric scanning. The varieties of purple pericarp rice, however, had two specific polypeptides (20 kDa and 48 kDa, respectively), which were not found in the varieties of ordinary rice. These two specific polypeptides accounted for 0.5-1.78% and 0.10-0.27% of the total seed proteins respectively. Determination of protein fractions extracted with several solvents revealed that the higher average total protein content in the purple pericarp rice (7.07 mg vs 6.51 mg) was mainly due to the higher average glutelin content as compared with ordinary rice (5.15 mg vs 4.40 mg).

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Accession: 008360823

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