KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Growth, Protein and Pigment Content of Rice Seedlings under Phosphorus Deprivation Condition

  • Yun, Song-Joong (Faculty of Biological Resources Sciences, and Institute for Agricultural Science and Technology, Chonbuk National University) ;
  • Park, Myoung-Ryul (Faculty of Biological Resources Sciences, and Institute for Agricultural Science and Technology, Chonbuk National University) ;
  • Kim, Young-Doo (National Honam Agricultural Experiment Station) ;
  • Kim, Key-Young (National Honam Agricultural Experiment Station) ;
  • Baek, So-Hyeon (National Honam Agricultural Experiment Station)
  • Published : 2003.06.01
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Abstract

Phosphorus (P) is a macronutrient playing important roles in many plant processes. Significant interest has been devoted to search and utilize genotypic variations in P use efficiency in rice but with little effort to understand its physiological and biochemical bases. In this study, we examined responses to P deprivation of some primary and secondary traits in 3-week-old seedlings of the three genotypes, Sobi-byeo (japonica), Dasan-byeo (japonica $\times$ indica) and Palawan (indica). In general, percent weight due to root was increased up to 26%, but amounts of root protein and proteins secreted from roots were decreased by 11 to 19% and 31 to 51 %, respectively, by 3 to 21 days of P deprivation in the three genotypes. Interestingly, however, responses of Palawan to short-term P deprivation were contrasting to those of Dasan-byeo and Sobi-byeo in seedling weight and contents of shoot protein, chlorophyll and anthocyanin. Seedling weight was not decreased, but shoot protein content was decreased in P-deprived seedlings of Palawan. Contents of chlorophyll in leaves and anthocynin in roots were increased in Dasan-byeo and Sobi-byeo, but decreased in Palawan. The results suggest that responses of protein and pigment synthesis to P deficiency are different in modem and traditional varieties and the difference may at least in part be due to the selection for high yield under highly fertilized conditions.

Keywords

References

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