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Genome Expression during Normal Leaf Development ¹

2. Direct Correlation between Ribulose Bisphosphate Carboxylase Content and Nuclear Ploidy in a Polyploid Series of Wheat

Department of Biology, University of York, York Y01 5DD England

The quantitative relationships between ribulose bisphosphate carboxylase, nuclear ploidy, and plastid DNA content were examined in the nonisogenic polyploid series Triticum monococcum (2x), Triticum dicoccum (4x), and Triticum aestivum (6x). Ribulose bisphosphate carboxylase per mesophyll cell increased in step with each increase in nuclear ploidy so the ratios of ribulose bisphosphate carboxylase per mesophyll cell (picograms) to nuclear DNA per mesophyll cell (picograms) were almost identical in the three species. Ribulose bisphosphate carboxylase per plastid was 14.1, 14.7, and 16.8 picograms in the 2x, 4x, and 6x ploidy levels, respectively. Plastid area in these three species decreased with increasing nuclear ploidy so the concentration of ribulose bisphosphate carboxylase in the plastoids was 60% higher in the hexaploid compared to the diploid species. DNA levels per plastid were 64 and 67 femtograms for the diploid and tetraploid species, respectively, but were 40% less in the plastids of the hexaploid species. These relationships are discussed in terms of cellular and plastid control of ribulose bisphosphate carboxylase content.

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