Grain Quality of Transgenic Rice with Enhanced Phosphorous by Overexpression of Phosphate Transporter

다국어 초록 (Multilingual Abstract)

This study was conducted to determine the effect of high phosphorus (P) on grain quality
of transgenic rice with enhanced grain P contents. Two transgenic lines expressing the high-affinity phosphate
transporter cDNA of tobacco (NtPT1) and non-transgenic control variety Donjin-byeo (control,
CTR) were cultivated at the test field and seeds were harvested. The P contents of brown rice seed of
transgenic lines increased by 16-43% over that of the CTR. The mean Mg/K ratio of grains was significantly
higher in the transgenic lines than in the CTR. The increased P in the transgenic grains resulted in
a significant decrease in pigmentation, but at the same time a substaintial increase in the palatability of
grains. Also, enhanced P in the transgenic grains induced increase in the total protein and fatty acid contents,
but did not affect the amylose content of brown grain. All the viscosity values except setback
viscosity were lower in the transgenic lines than in the control variety. Overall, all the physical characteristics
affecting the texture of grain except resilience did not vary between the transgenic lines and the
CTR. These results indicate that the higher P in the transgenic grains influenced positively on quality of
grains.

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