Abstract
Cryptangieae has recently been revised based on morphology and molecular phylogeny, but cytogenetic data is still scarce. We conducted this study with the aim of investigating the occurrence of holocentric chromosomes and pseudomonads, as well as understanding the mode of chromosomal evolution in the tribe. We performed analyses of meiotic behavior, chromosome counts, and reconstruction of the ancestral state for the haploid number. We present novel cytogenetic data for eight potentially holocentric species: Cryptangium verticillatum, Krenakia junciforme, K. minarum, Lagenocarpus bracteosus, L. griseus, L. inversus, L. rigidus, and L. tenuifolius. Meiotic abnormalities were observed, with parallel spindles being particularly noteworthy. Intra-specific variations in chromosome number were not found, which may indicate an efficient genetic control for the elimination of abnormal nuclei. The inferred ancestral haploid number was n = 16, with dysploidy being the main evolutionary mechanism. At least five chromosomal fissions occurred in Krenakia (n = 21), followed by a further ascending dysploidy event in Lagenocarpus (n = 17). As proposed for Cyperaceae, it is possible that cladogenesis events in Cryptangieae were marked by numerical and structural chromosomal changes.
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The authors thank the Coordination for the Improvement of Higher Education Personnel (CAPES) for the financial support to research.
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ALAC carried out the study, data analysis and wrote the manuscript. MTMF helped in the cytogenetic analysis and reviewed the manuscript. ME and ML reviewed the manuscript. SMC conceived the study, participated in its design and coordination, helped to draft and revised the manuscript, and provided financial support for the research.
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Chaves, A.L.A., Ferreira, M.T.M., Escudero, M. et al. Chromosomal evolution in Cryptangieae Benth. (Cyperaceae): Evidence of holocentrism and pseudomonads. Protoplasma 261, 527–541 (2024). https://doi.org/10.1007/s00709-023-01915-w
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DOI: https://doi.org/10.1007/s00709-023-01915-w