Genome size evolution and chromosome numbers of species of the cryptanthoid complex (Bromelioideae, Bromeliaceae) in a phylogenetic framework.

Autor: Cruz, Geyner Alves Dos Santos, Filho, José Roseno De Mendonça, Vasconcelos, Santelmo, Gitaí, Jaílson, Campos, José Marcello Salabert De, Viccini, Lyderson Facio, Zizka, Georg, Leme, Elton Martinez Carvalho, Brasileiro-Vidal, Ana Christina, Benko-Iseppon, Ana Maria
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Zdroj: Botanical Journal of the Linnean Society; Apr2020, Vol. 192 Issue 4, p887-899, 13p
Abstrakt: We describe the chromosome numbers and genome sizes of species of the cryptanthoid complex of Bromeliaceae in a phylogenetic framework and their relationship with habitat preferences. The 2C DNA contents varied 2.13-fold among species, ranging from 0.76 to 1.66 pg. A significant difference in DNA content was found among Cryptanthus , Hoplocryptanthus and Rokautskyia. Moreover, species from campos rupestres and the Atlantic Forest had lower and higher genome size values, respectively. The smaller genome sizes of Hoplocryptanthus spp. from campos rupestres may be related with the large genome constraint. The species show a highly conserved ploidy (with 2 n = 32 and 34), although the genome sizes varied considerably. The observed variation in chromosome numbers seems to be influenced by dysploidy, but additional investigations are needed. Our study demonstrates that the genome size variation in the cryptanthoid complex species is not strictly related to the phylogenetic relationships and has probably been influenced by different evolutionary processes. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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