Hybridization and heterosis in the Plicatula group of Paspalum

Novo, Patricia Elda; Acuña, Carlos Alberto; Quarín, Camilo Luis; Urbani, Mario Hugo; Marcón, Florencia; Espinoza, Francisco

doi:10.1007/s10681-017-1983-4

Cited by 16 publications

(34 citation statements)

References 24 publications

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“…Since then, large segregating progenies have been generated by crossing these artificially induced sexual tetraploid genotypes as female parents and apomictic ecotypes as pollen donors. This procedure has been repeatedly used over the last years attempting to improve P. notatum [ 72 , 73 , 74 , 75 ] and, more recently, P. simplex [ 131 ] and species of the Plicatula group [ 70 ]. The experience with P. notatum indicates that only a reduced fraction of the progeny (around 10%) inherits the full capacity to express apomixis [ 72 , 73 , 74 ] and variable degrees of apospory expressivity are observed within hybrids [ 73 , 74 , 75 ].…”

Section: Advances In Methods For Improving Apomictic Pasmentioning

confidence: 99%

“…Currently, a large number of well-characterized sexual tetraploid individuals, generated by chromosome doubling treatments (sometimes followed by experimental crosses) are available for the three species [ 33 , 50 , 51 , 53 , 67 , 68 ]. Moreover, several sexual genotypes of P. simplex and P. plicatulum were also used as female parents in interspecific crosses with different members of the Anachyris subgenus and the Plicatula group, respectively, widening the genetic studies to other species of the genus [ 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Section: The Genetic Control Of Apomixis In Paspalummentioning

confidence: 99%

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How to Become an Apomixis Model: The Multifaceted Case of Paspalum

Ortiz

Pupilli

Acuña

et al. 2020

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In the past decades, the grasses of the Paspalum genus have emerged as a versatile model allowing evolutionary, genetic, molecular, and developmental studies on apomixis as well as successful breeding applications. The rise of such an archetypal system progressed through integrative phases, which were essential to draw conclusions based on solid standards. Here, we review the steps adopted in Paspalum to establish the current body of knowledge on apomixis and provide model breeding programs for other agronomically important apomictic crops. In particular, we discuss the need for previous detailed cytoembryological and cytogenetic germplasm characterization; the establishment of sexual and apomictic materials of identical ploidy level; the development of segregating populations useful for inheritance analysis, positional mapping, and epigenetic control studies; the development of omics data resources; the identification of key molecular pathways via comparative gene expression studies; the accurate molecular characterization of genomic loci governing apomixis; the in-depth functional analysis of selected candidate genes in apomictic and model species; the successful building of a sexual/apomictic combined breeding scheme.

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Section: Advances In Methods For Improving Apomictic Pasmentioning

confidence: 99%

Section: The Genetic Control Of Apomixis In Paspalummentioning

confidence: 99%

How to Become an Apomixis Model: The Multifaceted Case of Paspalum

Ortiz

Pupilli

Acuña

et al. 2020

Genes

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“…The collection of a sexual diploid ecotype of P. plicatulum and its chromosome duplication resulted in the generation of a sexual tetraploid plant, allowing the release of the diversity present in apomictic genotypes (Sartor, Quarin, & Espinoza, ). P. plicatulum and P. guenoarum have been used in interspecific hybridizations (Aguilera et al, ; Novo et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Agronomic performance studies have shown that hybrids obtained have genetic potential for high DMY, cold tolerance (Motta, Dall’Agnol, Pereira, Machado, & Simioni, ) and beef cattle preference for grazing (Novo et al, ). However, there are limited data for DMY and nutritive value of these hybrids when subjected to different N fertilizer rates or in mixture with legumes.…”

Section: Introductionmentioning

confidence: 99%

Nutritive value and herbage mass in hybrids of Paspalum plicatulum × Paspalum guenoarum fertilized with nitrogen or in mixture with temperate legumes

et al. 2020

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Animal production in tropical and subtropical areas of the world is largely dependent on native or cultivated pastures, which requires higher production, quality and adaptation of forage plants (Jank, Valle, & Resende, 2011). Agronomic practices such as nutrient management and species selection or the combination of these two factors are some of the options for increasing dry matter yield (DMY) and forage nutritive value in pastures. Proper soil fertility management is required for efficient grass forage production. Nitrogen (N) has an effect on crop growth, development and physiological processes (Seepaul, Macoon, Reddy, & Evans, 2016), and supply of N fertilizer tends to improve yields and nutritive value in warm-season grasses (Obour,

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“…Embryo sac observation is the most popular method among plant breeders (Weiler et al, 2017; Zilli et al, 2018), since it is inexpensive and reliable. Flow cytometric seed analysis is also effectively used for some species (Novo et al, 2017). Field progeny tests are based on observing the homogeneity within the progeny (Burton, 1992).…”

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confidence: 99%

Breeding Tetraploid Paspalum simplex: Hybridization, Early Identification of Apomicts, and Impact of Apomixis on Hybrid Performance

et al. 2019

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Apomictic grasses predominate among tropical forages, and specific breeding techniques are needed for their genetic improvement. The objectives of this study were (i) to generate hybrids by crossing tetraploid sexual and apomictic Paspalum simplex Morong genotypes, (ii) to develop a technique based on molecular markers for early identification of apomictic hybrids, and (iii) to determine the relationship between mode of reproduction and performance of hybrids. Crosses were made between two induced sexual and seven apomictic tetraploid plants. Identification of apomictic hybrids during seedling stage was performed using a marker linked to apomixis, and by flow cytometric seed analysis. Hybrids were evaluated under field conditions for plant diameter and height, initial growth, and seasonal regrowth during two consecutive growing seasons. Sexual tetraploid plants used as female parents behaved as allogamous, since 95% of the progeny had male‐specific markers. The ratio between apomictic and sexual hybrids differed from 1:8.7 to 1:0.6 among crosses, with a mean of 1:2.4. There was a 96% coincidence between the use of the apomixis‐linked marker and flow cytometric seed analysis. A technique based on the use of early DNA isolation and the amplification of a molecular marker linked to apomixis was developed. We found no overall difference between apomictic and sexual hybrids for the evaluated traits, except for fall regrowth in the first year, for which apomictic hybrids were superior. Generation of large tetraploid hybrid progenies is possible in P. simplex. Segregation for mode of reproduction depends on parents involved. Agronomic performance is not related to reproductive mode among tetraploid hybrids.

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Hybridization and heterosis in the Plicatula group of Paspalum

Cited by 16 publications

References 24 publications

How to Become an Apomixis Model: The Multifaceted Case of Paspalum

How to Become an Apomixis Model: The Multifaceted Case of Paspalum

Nutritive value and herbage mass in hybrids of Paspalum plicatulum × Paspalum guenoarum fertilized with nitrogen or in mixture with temperate legumes

Breeding Tetraploid Paspalum simplex: Hybridization, Early Identification of Apomicts, and Impact of Apomixis on Hybrid Performance

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