Residual sexuality and its seasonal variation in natural apomictic Paspalum notatum accessions

Rebozzio, Romina Natalia; Sartor, Maria Esperanza; Quarín, Camilo Luis; Espinoza, Francisco

doi:10.1007/s10535-011-0062-2

Cited by 31 publications

(48 citation statements)

References 22 publications

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“…, Rebozzio et al. , Rios et al. ) may also be exploited to increase genetic diversity, especially if seed is harvested at the beginning or at the end of the flowering season when facultative apomicts exhibits greater potential for sexual reproduction (Rebozzio et al.…”

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confidence: 99%

Breeding apomictic bahiagrass (Paspalum notatum Flügge) with improved turf traits

et al. 2017

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The development of a turf‐type bahiagrass could have a remarkable impact on the billion‐dollar turf industry in the south‐eastern United States. The goals of this study were to (i) select bahiagrass genotypes with improved turf attributes and (ii) determine the reproductive mode and seed fertility of selected genotypes. The population included mutants, wild types, hybrids and standard cultivars evaluated at two locations for two years. Morphological variation was observed and clonal repeatability (H2) ranged from 0.27 to 0.90. Flowering was extremely reduced in some mutants, which also exhibited dark green colour, finer texture and reduced canopy height. Cytoembryological observations revealed that diploids reproduced sexually and tetraploids by obligate or facultative apomixis. Genotypes with superior seed fertility were identified, while others were comparable to the standard cultivars. While mutant plants exhibited great morphological variation, the random mutations did not affect their reproductive mode, validating the use of mutagenesis in apomictic species. The high H2 indicated that selection for improved turf attributes could be successfully performed with the advantage of clonal seed propagation.

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confidence: 99%

Breeding apomictic bahiagrass (Paspalum notatum Flügge) with improved turf traits

et al. 2017

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“…In other species of the genus, it was already observed a drastic decline of the real expression of sexuality when it was assessed at different stages of development, from megagametogenesis through mature ovules, mature seeds, and the subsequent progeny. It seems that there is some biological disadvantages of sexual embryo sacs or sexually formed seeds in relation to apomictic development (Rebozzio et al, 2011;Hojsgaard et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Interspecific hybrids between Paspalum plicatulum and P. oteroi: a key tool for forage breeding

Novo¹,

Valls

Galdeano

et al. 2016

Sci. agric. (Piracicaba, Braz.)

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Grama-tio-pedro (Paspalum oteroi Swallen) is a rare stoloniferous grass of the Plicatula group of Paspalum, well adapted to continuous grazing in areas subject to seasonal flooding in the Pantanal region, in central western Brazil. The species is a facultative apomictic (asexual reproduction by seed) tetraploid, sporadically cultivated on Pantanal farms, propagated either by cuttings or seed. Due to its potential for extensive cultivation and forage quality, Grama-tiopedro appears as a candidate for genetic improvement within the Plicatula group through plant breeding. We used a colchicine-induced sexual autotetraploid genotype of P. plicatulum Michx.to obtain interspecific hybrids using the apomictic species, P. oteroi, as pollen donor. The very similar meiotic chromosome behavior observed in both parents, with main quadrivalent and bivalent associations, suggested that P. oteroi is a natural autotetraploid. The hybrids showed less irregular meiotic behavior with fewer quadrivalents and more bivalents than either parent. Fertility among interspecific hybrids varied from complete sterility in some of them to seed productions in others that were approximately twice as much as for either parent. The great variability of seed set performance may well be a drastic genetic consequence of joining two homologous chromosome sets of P. plicatulum together with two homologous sets of P. oteroi that, in turn, have some homeology between them. Most hybrids reproduce by sexual means, thus, they could be used as female parents in backcrosses and in crosses with other species of the Plicatula group for interspecific gene transferring in breeding programs.

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“…These results are in agreement with previous reports that showed a dramatic decrease of achieved sexual reproduction in the progeny when compared to the degree of residual sexuality estimated at embryological stages of a facultative apomictic Paspalum species. For example, the degree of sexual reproduction for three facultative apomictic accessions of P. notatum had been estimated to vary from approximately 15 to 95%, according to cytoembryological studies (Rebozzio et al, 2011). However, 95 to 100% of the individuals of their progenies had the corresponding maternal genotype, that is, the same fingerprint pattern as estimated by AFLP markers.…”

Section: Characteristics and Discussionmentioning

confidence: 99%

“…Progenies of Boyero UNNE, Q4117, and Q4205 were obtained from seed produced under open pollination. The AFLP analyses were conducted according to the same protocol followed by Rebozzio et al (2011).…”

Section: Methodsmentioning

confidence: 99%

Registration of ‘Boyero UNNE’ Bahiagrass

Urbani

Acuña

Doval

et al. 2016

J of Plant Registrations

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‘Boyero UNNE’ (Reg. No. CV‐5, PI 676021) bahiagrass (Paspalum notatum Flüggé) was registered with the National Register of Plant Cultivars and the National Register of Property for Plant Cultivars, Ministry of Agriculture, Livestock Exploitations, and Fisheries of Argentina, Resolution no. 276 in August 2012 (Reg. No. 3213) and released by the National University of the Northeast (UNNE), Faculty of Agricultural Sciences (FCA), Corrientes, Argentina. Boyero UNNE is a tetraploid, highly apomictic F1 hybrid developed between an experimentally obtained female parent, reproducing sexually, and an apomictic, wild bahiagrass genotype. It is the first registered cultivar of a tetraploid apomictic P. notatum developed by breeding through a sexual × apomictic hybridization scheme, exploiting apomixis and plant selection in the F1 progeny. The new cultivar has a more upright growing habit than tetraploid bahiagrass cultivars currently in use or wild tetraploid biotypes. It can produce approximately 19% more forage dry matter than its apomictic male parent, largely exceeding (20–51%) the wild bahiagrass type currently found in natural pasturelands of northeastern Argentina, and it produced 4 to 26% more than the cultivar Argentine at three locations in Florida, USA.

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Residual sexuality and its seasonal variation in natural apomictic Paspalum notatum accessions

Cited by 31 publications

References 22 publications

Breeding apomictic bahiagrass (Paspalum notatum Flügge) with improved turf traits

Breeding apomictic bahiagrass (Paspalum notatum Flügge) with improved turf traits

Interspecific hybrids between Paspalum plicatulum and P. oteroi: a key tool for forage breeding

Registration of ‘Boyero UNNE’ Bahiagrass

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