Chromosomal evolution in Cryptangieae Benth. (Cyperaceae): Evidence of holocentrism and pseudomonads

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 th...

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Bibliographic Details
Published in:Protoplasma 2024-05, Vol.261 (3), p.527-541
Main Authors: Chaves, Ana Luisa Arantes, Ferreira, Marco Tulio Mendes, Escudero, Marcial, Luceño, Modesto, Costa, Suzana Maria
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Cell Biology
Chromosome number
Chromosomes
Cyperaceae
Cytogenetics
Evolution
Genetic control
Lagenocarpus
Life Sciences
Meiosis
Original Article
Phylogeny
Plant Sciences
Spindles
Zoology
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Summary: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.
ISSN:0033-183X
1615-6102
DOI:10.1007/s00709-023-01915-w