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

Abstract

Angelonia integerrima Sprengel is a native species of the state of Mato Grosso do Sul and the Southern region (Paraná, Santa Catarina and Rio Grande do Sul) of Brazil, with features such as an unusual appearance and color of the flowers, indicating an ornamental use. To optimize the use of this species and to fill in gaps regarding its cytogenetic characterization, this study determined the chromosome number, meiotic index and pollen viability of plant individuals of four A. integerrima populations. All plant individuals of the four populations had 2n = 20 chromosomes. Still, the meiotic index of most analyzed plant individuals exceeded 90%, while pollen viability of all plant individuals was higher than 80%. These data suggest considerable cytological stability of the analyzed A. integerrima plant individuals, which may favor the selection of future genotypes for commercial purposes or their use in conservation and breeding programs of the species.

Morphological and cytogenetic characterization of new ornamental Passiflora hybrids (P. ‘Vivis’ and P. ‘Jhovi’)

“…Therefore, the F 1 hybrid progeny had high pollen viability, because >70% is considered a high value (Moreira and Gurgel 1940). High pollen viability was found in P. subrotunda, species of ornamental value (Souza et al 2018), and in other species (Tolomeotti et al 2018, Tedesco et al 2019, Krycki et al 2020, including tetraploid plants (Krycki et al 2016). Normal meiotic behavior has been reported in interspecific F 1 hybrids obtained from a cross between P. sublanceolata and P. foetida var.…”

Reproductive analyses of intraspecific Paspalum notatum Flügge hybrids.

“…About 1000 mature pollen grains per plant were counted in four flowers per plant (250 pollen grains per plant), following the protocol established and used (Dahmer et al 2008, Guerra et al 2013, Krycki et al 2016. The pollen viability estimate was calculated by the percentage of viable grains: number of grains considered viable divided by the total number of grains multiplied by 100 (Tedesco et al 2019).…”

DNA polymorphism of Desmanthus spp. accessions based on AFLP markers

“…The association of the bacteria with the nitrogen-fixing Rhizobiaceae family (Beyhaut et al, 2006;Freitas et al, 2011) allows intercropping of this legume with low nitrogen-fixing cultivars. Besides that, native plants are of great interest because are ecologically adapted (Silva et al, 2018;Tedesco et al, 2019;Almeida et al, 2019).…”