Abstract
The tribe Leucocoryneae is taxonomically and cytogenetically complex, mainly due to its extraordinary morphological and karyological variation. Robertsonian translocations had long been recognized as a central factor contributing to karyotype diversity within the Leucocoryneae, but so far no major tendency prevailing on the observed complexity of karyotype formula among species has been identified. The assessment of nuclear DNA contents by flow cytometry using propidium iodide in 23 species, representing all genera within the tribe, showed a monoploid genome size variation of 1Cx = 9.07–30.46 pg denoting a threefolds fluctuation. A highly significant linear association between the average DNA content per chromosome arm (2C/FN) and the monoploid genome size (1Cx) is reported for the first time and identified as a novel indicator of a trend governing karyotype diversity within Leucocoryneae. This trend shows that a reduction in DNA content per chromosome arm is influencing and has shaped karyotype evolution of different monophyletic groups within the tribe despite the complex karyotype diversity and apparently contrasting patterns of genome sizes.
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Acknowledgements
AS and LG are grateful to Floriculture Institute (INTA Castelar, Buenos Aires, Argentina), especially to MS Soto, MA Coviella and V Bugallo for their valuable help in cytometric measurements. This study was supported by fellowships awarded to AS by CONICET (Argentina), grants from IAPT and the National Geographic Explorer project, and a grant from ANCYPT, préstamo BID-PICT 2013 0298 to LG. Finally, our thanks to the reviewers for improving this manuscript.
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Sassone, A.B., López, A., Hojsgaard, D.H. et al. A novel indicator of karyotype evolution in the tribe Leucocoryneae (Allioideae, Amaryllidaceae). J Plant Res 131, 211–223 (2018). https://doi.org/10.1007/s10265-017-0987-4
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DOI: https://doi.org/10.1007/s10265-017-0987-4