| Title: |
Macroevolutionary trends in the karyotypic evolution of Caesalpinioideae (Leguminosae). |
| Authors: |
Mata‑Sucre, Yennifer; Gomes de Andrade, Maria José; Marques, André; Carvalho-Sobrinho, Jefferson; Souza, Gustavo; Santos, Angeline Maria da Silva; Felix, Leonardo P; Lewis, Gwilym P; Moraes, Ana Paula; Souza Santos, Géssica |
| Contributors: |
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| Publisher Information: |
Oxford University Press (OUP) |
| Publication Year: |
2025 |
| Subject Terms: |
Polyploidy; Heterochromatin; Basic chromosome numberr; Caesalpinioideae; Genome size; ChromEvol; Ancestral reconstruction; Dysploidy |
| Description: |
Caesalpinioideae is the most complex subfamily of Leguminosae from taxonomic, phylogenetic, and cytogenetic perspectives. The subfamily comprises 163 genera and 4680 species occurring in ecologically diverse environments, mostly in tropical but reaching temperate zones. It encompasses 11 tribes of which Mimoseae stands out for representing most of the taxonomic diversity of the subfamily with 100 genera and c. 3500 species. We investigated karyotypic evolution of the subfamily through analysing cytogenetic traits in a dated phylogenetic framework using literature and newly generated data. We sampled 471 taxa for chromosome number counting, 216 taxa for genome size, and 98 taxa for heterochromatin analysis. Additionally, we provide new karyotypic analyses for 33 taxa using chromomycin A3 (CMA) and 4′, 6-diamidino-2-phenylindole (DAPI) double staining. The analysed karyotypes exhibited polymorphisms in chromosome number as well as in the number and position of CMA+ bands. Our analyses suggest that the pattern of heterochromatin distribution evolved independently in the subfamily. Our analyses suggest x = 14 as the ancestral number for Caesalpinioideae and revealed distinct trends of descending dysploidy and polyploidy among clades. The smaller genome size and the lower number of heterochromatin bands in Mimoseae in relation to other Caesalpinioideae lineages suggest that diploidized palaeopolyploid genomes arose approximately 45 Mya. This study represents the first large-scale investigation of chromosomal evolution in Caesalpinioideae and revealed that the clade-specific 2n stability contrasts with a dynamic evolution of heterochromatin which may be associated with genomic reshuffling experienced in this legume group. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
Botanical Journal of the Linnean Society; https://doi.org/10.1093/botlinnean/boaf067 |
| DOI: |
10.1093/botlinnean/boaf067 |
| Availability: |
https://doi.org/10.1093/botlinnean/boaf067 |
| Accession Number: |
edsbas.FB019871 |
| Database: |
BASE |