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Flow cytometric and Feulgen densitometric analysis of genome size variation in Pisum

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Abstract

A DAPI and ethidium bromide flow cytometric and Feulgen densitometric analysis of genome size variation in Pisum was conducted. The material included 38 accessions of P. sativum of widely different geographic origin and altogether 14 samples of P. elatius, P. abyssinicum, P. humile and P. fulvum. The relative genome size values obtained with the three staining methods were strongly correlated. No evidence for genome size variation was found among P. sativum cultivars. In particular, certain Italian cultivars, for which strongly deviating C-values have been reported, proved to be invariant. The only occasion when ambiguous evidence for marginal genome size variation was found was when all 38 accessions taxonomically affiliated with P. sativum were considered. Pisum abyssinicum and P. fulvum differed from P. sativum by about 1.066-and 1.070-fold, respectively; 1 accession of P. humile differed by 1.089-fold, and 2 of P. elatius by 1.122- and 1.195-fold, respectively (ethidiumbromide comparison), while the other accessions of these taxa were not different from P. sativum. This variation may indicate taxonomic inhomogeneity and demands further investigation. Cultivated P. sativum has long been suspected of not being constant with respect to genome size. As shown here, these findings were not based on genuine differences, but rather were technical in origin.

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  1. Institute of Botany, University of Vienna, Rennweg 14, A 1030, Vienna, Austria

    M. Baranyi & J. Greilhuber

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  1. M. Baranyi
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  2. J. Greilhuber
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Communicated by F. Mechelke

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Baranyi, M., Greilhuber, J. Flow cytometric and Feulgen densitometric analysis of genome size variation in Pisum . Theoret. Appl. Genetics 92, 297–307 (1996). https://doi.org/10.1007/BF00223672

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  • DOI: https://doi.org/10.1007/BF00223672

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