Interspecific Tetraploid Hybrids between Two Forage Grass Species: Sexual <i>Paspalum plicatulum</i> and Apomictic <i>P. guenoarum</i>

Aguilera, Patricia Mabel; Sartor, Maria Esperanza; Galdeano, Florencia; Espinoza, Francisco; Quarín, Camilo Luis

doi:10.2135/cropsci2010.10.0610

Cited by 33 publications

(53 citation statements)

References 21 publications

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“…The genus Paspalum includes the largest number of native species and also those with the highest quality of animal feed (Nabinger et al, 2009;Aguilera et al, 2011). However, research that assists in selection strategies for the breeding of these species in Brazil is scarce.…”

Section: Introductionmentioning

confidence: 99%

Genetic gain in apomictic species of the genus Paspalum

et al. 2017

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1The objective of this work was to provide means to obtain genetic gain in apomictic species of the genus Paspalum by identifying traits that simultaneously show high correlation and heritability. Thus, to determine the amount of phenotypic variation due to genetic and environmental effects and the degree of association between leaf dry matter production and other traits of forage interest that are easy to select and measure will bring agility and economy in the selection of forage species. The experiment was conducted in the years 2009/10 and 2010/11 in the municipalities of Eldorado do Sul and Augusto Pestana, RS, Brazil, in a randomized complete block design with three replicates. The increase in the direct selection pressure on total and leaf dry matter of apomictic accesses of the genus Paspalum is enhanced by a greater contribution of genetic effects than environmental effects on the composition of the phenotypic variance. Efficient genetic gain in leaf production is achieved by indirect selection of total dry matter, which is a trait of high heritability and easy to select and measure.

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Section: Introductionmentioning

confidence: 99%

Genetic gain in apomictic species of the genus Paspalum

et al. 2017

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“…There is a large list of previous reports indicating that segregation for reproductive mode occurs among individuals of an F 1 progeny when a sexual plant is crossed with an apomictic one in several species of Paspalum (e.g., Martínez et al, 2001;Stein et al, 2004;Aguilera et al, 2011;Novo et al, 2013). Consequently, segregation for the reproductive mode was also expected among the P. plicatulum × P. oteroi hybrids.…”

Section: Discussionmentioning

confidence: 97%

“…This obstacle may be overcome by doubling the number of chromosomes of diploid plants to produce sexual tetraploids (Forbes and Burton, 1961;Sartor et al, 2009). Sexual induced-tetraploid germplasm of P. plicatulum is currently available (Sartor et al, 2009) and easily hybridizes with other species of the Plicatula group as pollen donors (Aguilera et al, 2011;Novo et al, 2013). This study aimed to hybridize sexual tetraploid P. plicatulum with apomictic tetraploid P. oteroi to establish their cytogenetic relationship and to determine the reproductive behavior and fertility of the hybrids in order to explore the possibility of gene exchange in breeding programs of these species.…”

Section: Introductionmentioning

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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“…Estas espécies são tetraplóides (2n = 4x = 40) e apomíticas e as cultivares lançadas foram selecionadas a partir de genótipos naturais coletados principalmente na América do Sul, sem passar por qualquer processo de melhoramento genético (AGUILERA et al, 2011).…”

Section: Introductionunclassified

“…Posteriormente, o cruzamento entre a cultivar apomítica Rojas de Paspalum guenoarum e a planta sexual tetraploide 4c-4x de P. plicatulum, realizado por Aguilera et al (2011) proporcionou a obtenção de 23 híbridos interespecíficos que, tiveram seu modo de reprodução determinado e mais tarde foram testados a campo com o objetivo de verificar seu potencial genético para produção de forragem (PEREIRA et al, 2015).…”

Section: Introductionunclassified

Forage value of superior interspecific hybrids of Paspalum

Motta

Dall'Agnol

Pereira

et al. 2017

Revista Ciência Agronômica

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RESUMO -O objetivo deste estudo foi avaliar a expressão de caracteres agronômicos e a tolerância ao frio de híbridos apomíticos de Paspalum plicatulum x P. guenoarum, bem como estimar suas correlações fenotípicas, em duas regiões edafoclimáticas distintas. O estudo foi conduzido em diferentes locais e anos de avaliação, em delineamento de blocos ao acaso, com três repetições. Foram avaliados quatro híbridos interespecíficos de Paspalum, dois genótipos de P. guenoarum e a cv. Aruana (Panicum maximum), utilizada como testemunha. Os híbridos H12, H13, H20 e H22 apresentaram superioridade para os caracteres agronômicos avaliados e tolerância ao frio, em relação às cvs. Rojas e Aruana e ao ecótipo Azulão, e são indicados para novas etapas de avaliação, como estimativas da produção de sementes e estudos de DHE e VCU, visando o lançamento como novas cultivares. As estimativas de correlações fenotípicas são importantes ferramentas para a seleção de progênies, com destaque para o caráter MSF que apresentou alta correlação positiva com os caracteres MST, DPP, rebrote e altura, indicando ser desnecessária a realização de separação morfológica, economizando tempo e mão de obra em um programa de melhoramento de forrageiras.Palavras-chave: Apomixia. Hibridação. Paspalum guenoarum. Paspalum plicatulum. Produção de forragem.ABSTRACT -The aim of this study was to evaluate the expression of agronomic characteristics and tolerance to cold in apomictic Paspalum plicatulum x P. guenoarum hybrids, and estimate their phenotypic correlations in two different regions of soil and climate. The study was conducted at different locations and evaluated in different years, in a randomised block design with three replications. Four interspecific hybrids of Paspalum and two genotypes of P. guenoarum were evaluated, with the Aruana cultivar (Panicum maximum) used as a control. The H12, H13, H20 and H22 hybrids proved to be superior in tolerance for cold and the agronomic traits evaluated relative to the Rojas and Aruana cultivars and the Azulão ecotype, and are suitable for new stages of assessment, such as estimates of seed production and studies of DHS and VCU, with a view to their release as new cultivars. Estimates of phenotypic correlations are important tools in progeny selection, especially the characteristic of LDM, which showed a high positive correlation with the characteristics TDM, PDP, regrowth and height, demonstrating that carrying out morphological separation is unnecessary, saving time and labour in a forage breeding program.

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Interspecific Tetraploid Hybrids between Two Forage Grass Species: Sexual Paspalum plicatulum and Apomictic P. guenoarum

Abstract: Abbreviations: FCSS, fl ow cytometry seed screen; GR, cultivar Rojas of P. guenoarum; 4PT, sexual induced-tetraploid P. plicatulum; PMC, pollen mother cell; RAPD, random amplifi ed polymorphic DNA.

Cited by 33 publications

References 21 publications

Genetic gain in apomictic species of the genus Paspalum

Genetic gain in apomictic species of the genus Paspalum

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

Forage value of superior interspecific hybrids of Paspalum

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