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. 1984 Apr;74(4):759–765. doi: 10.1104/pp.74.4.759

Differences between Wheat Genotypes in Specific Activity of Ribulose-1,5-bisphosphate Carboxylase and the Relationship to Photosynthesis

John R Evans 1,1, Jeffrey R Seemann 1,2
PMCID: PMC1066764  PMID: 16663506

Abstract

The in vitro ribulose-1,5-bisphosphate (RuBP) carboxylase activity per unit of leaf nitrogen was found to be 30% greater in Triticum aestivum than in T. monococcum. This was due to a higher specific activity of the enzyme from T. aestivum, as the amount of RuBP carboxylase protein per unit of total leaf nitrogen did not differ between the genotypes. The occurrence of higher specific activity of RuBP carboxylase is shown to correlate with possession of the large subunit derived from the B genome of wheat.

Despite the greater RuBP carboxylase activity per unit of leaf nitrogen in T. aestivum, the initial slopes of curves relating rate of CO2 assimilation to intercellular p(CO2) are similar in T. aestivum and T. monococcum for the same nitrogen content per unit leaf area. The similarity of the initial slopes is the result of a greater resistance to CO2 transfer between the intercellular spaces and the site of carboxylation in T. aestivum than in T. monococcum.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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