Cytological and reproductive aspects in the Caespitosa group of Paspalum

Abstract

Somatic chromosome numbers are reported for thirty four germplasm accessions of

Taxonomic Revision of Paspalum Group Caespitosa (Poaceae, Panicoideae, Paspaleae)

“…In addition to these, about 30 groups without a formal taxonomic level were proposed within subgenus Paspalum, mainly based on morphological characters of inflorescences and spikelets, due to the difficulty of establishing clear limits between sections (Chase, 1929(Chase, , 1939. These informal groups, most of them without phylogenetic support (Rua et al, 2010;Scataglini et al, 2014), were used in taxonomic, cytological, and phylogenetic studies involving Paspalum species (e.g., Cialdella et al, 1995;Morrone et al, 1995aMorrone et al, , 1996Morrone et al, , 2000Morrone et al, , 2004Oliveira & Valls, 2002;Oliveira, 2004;Denham et al, 2010;Rua et al, 2010;Pozzobon et al, 2013;Scataglini et al, 2014;Delfini et al, 2019); it should be stressed that, in the absence of a complete phylogeny of the genus, and due to the complexity of the evolution of their genome, groups defined by Chase (1929Chase ( , 1939 are still the best approach to resolve the taxonomy of Paspalum.…”

IAPT chromosome data 36

“…Our results from Brazilian accessions confirm previous counts of 2n = 20 for Paspalum fimbriatum from the United States (Florida), Dominican Republic, Trinidad and Venezuela (Banks, 1964;Gould & Soderstrom, 1967;Davidse & Pohl, 1972, P. juergensii from Argentina, Bolivia, Brazil, Paraguay (Burson & Bennett, 1971b;Sede & al., 2010; and Uruguay (Vaio & al., 2007 flow cytometry estimations), P. multicaule from Costa Rica, Venezuela and several Brazilian states (Pohl & Davidse, 1971;Davidse & Pohl, 1974;Berto & al., 2020), as well as for the Brazilian endemic species P. redondense (Pozzobon & al., 2013; and P. scalare Berto & al., 2020).…”

“…However, the specimen counted here for the first time, with 2n = 60 chromosomes, also documents a southern extension, towards Quissamã, in the state of Rio de Janeiro. The species has been assigned to the informal group Caespitosa (Maciel & al., 2009;Delfini & al., 2019), where the compiled chromosome counts correspond to diploid, triploid and tetraploid levels (Pozzobon & al., 2013;Delfini & al., 2019), so the hexaploid level shown by P. divergens is very peculiar.…”

Ensino De Biologia Animal Pelo Edutretenimento: A Produção Do Programa "Rádio Animal" E Sua Utilização Na Divulgação Científica

“…Esse modo de reprodução em Paspalum acaba se tornando um grande obstáculo, dificultando a recombinação genética e a proteção de cultivares (Huber et al, 2016). Alguns estudos realizados com o gênero a partir da análise citogenética, revelaram acessos diploides, que são de reprodução sexual (Pozzobon et al, 2008, Pozzobon et al, 2013. Já Quarin et al, (2001) explica que em nível diploide o gene da apomixia está presente, porém não expresso na planta diploide.…”