1993 Fiscal Year Final Research Report Summary
STUDIES ON GENETIC CONTROL OF THE RATE SYSTHESIS AND DECONPOSITION OF RICE LEAF RuBisCO
| Project/Area Number |
03454035
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Breeding science
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| Research Institution | YAMAGATA UNIV. |
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Principal Investigator |
SASAHARA Takeo FAC.AGRI.YAMAGATA UNIV.PROF., 農学部, 教授 (20005606)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Toshinori FAC.AGRI.YAMAGATA UNIV.ASSOCIATE PROF., 農学部, 助教授 (80202670)
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| Project Period (FY) |
1991 – 1993
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| Keywords | RuBisCO / translocatable / amino acid / aspartic acid / valine / leucine glutamic acid / photosynthesis / leaf blade |
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| Research Abstract |
This study was carried out to examine decomposition and systhesis characteristics of RuBisCO which occupies almost all of the proteins in the photosynthetic organs, leaves and leaf sheath.
Dominanat amino acids were selected as an indicator for turn-over characteristics of RuBisCO, i.e.asparartic acid, valine, leucine and glutamic acid.
Concentration of these indicators in flag leaf decreased with aging of leaves in all the materials used. However, the decreasing characteristics of amino acids differed in ecospecies and/or cultivars. Especially, the dominant amino acids could not be detected in japonica cultivars at ripening stage. The same trend was also observed in indica/and javanica cultivars, but leucine in javanica and valine in indica cultivars tended to remain farily highly even at ripening stage.
Amino acid sequence has been crarified. However, in the present experiment amino acids in RuBisCO were converted to translocatable components mentioned-above. This fact would be true in the other nitorgen-containing components in leaves.
It was indicated that photosynthetic rate changes in parallel with concentration of free amino acids.
Thus, variation of free amino acids in leaves would be important in relatin to plant production and accumulation process of storage proteins.
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