New wild diploids in Paspalum notatum Flügge (Poaceae): potential accessions for use in breeding.

Abstract

Paspalum notatum is a polymorphic species with two accepted varieties, according to the ploidy level. The ploidy level is closely related to the reproductive mode of this species. Usually, diploid cytotypes have sexual reproduction, and tetraploid cytotypes have an apomictic reproduction. Apomixis limits genetic recombination, hindering the development of new cultivars. The identification of sexual plants represents many possibilities in breeding programs. This study aimed to analyze the chromosome number in P. notatum accessions under agronomic evaluation. Ploidy level was determined in 25 accessions. Two ploidy levels were detected, resulting in 21 tetraploid and four diploid accessions. The four diploid accessions originate from Argentina and Uruguay, in a region close to the origin of Pensacola, which is a diploid sexual cultivar of P. notatum. These new diploid accessions may be useful in the development of breeding programs of Paspalum species.

Genetic Similarity Among Accessions of Paspalum notatum Flügge (Poaceae): a Potential to Parental Selection

“…The observed genetic similarity allowed separation of the 53 accessions of P. notatum into seven groups and two isolated genotypes. These groups did not present a clear relation with the region of origin of the accessions, as well as forage production [2], morphologic analysis [21] or ploidy [20]. Low genetic similarity was also observed among the diploid accessions, 66N, 67N, 92N, and Pensacola, although they grouped together (Figure 1).…”

“…The discovery of new wild diploid accessions of P. notatum has great importance for breeding programs, since they can increase the number of possible crosses with apomictic tetraploids after chromosome doubling. Four wild diploid accessions of Paspalum notatum have recently been identified [20]. These accessions exhibited higher dry matter production and greater persistence in winter conditions than Pensacola [2], and morphological traits that allow them to be differentiated from Pensacola [21].…”

Comparing control options for time‐series RNA sequencing experiments in nonmodel organisms: An example from grasses

“…Seeds of Paspalum notatum (Accession no. 241878, tetraploid population) (Fachinetto, Dall'Agnol, Schifino‐Wittmann, Simioni, & Avila, ) and P. juergensii (Accession no. 508779, diploid) (Williams, Williamson, & Real, ) were acquired from the United States Department of Agriculture (USDA) National Plant Germplasm System (https://www.ars-grin.gov/npgs/).…”

Cytogenetic characterization of Angelonia integerrima Sprengel, a native species with ornamental potential

“…In addition, it is emphasized that several authors, such as Krycki et al (2016), Costa et al (2018), Fachinetto et al (2018), Tolomeotti et al (2018) and Silva et al (2018), have carried out studies involving native species of economic importance, such as the present study.…”