Manejo de Paspalum dilatatum Poir. biótipo Virasoro. 1. Produção, composição química e persistência

Baréa, Karinne; Scheffer-Basso, Simone Meredith; Dall'Agnol, Miguel; Oliveira, Bárbara Natália de

doi:10.1590/s1516-35982007000500002

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Several polyploid biotypes, including sexual tetraploids, apomictic pentaploids and hexaploids have been described (Casa et al 2002). Valued for its vigour, dallisgrass produces yields of up to 15 tons of dry matter per hectare (Cook et al 2005) with crude protein concentrations of up to 18.6 % (Baréa et al 2007). It can withstand heavy grazing and is somewhat tolerant to frost and water stress (Hutton and Nelson 1968; Robinson et al 1988).…”

Section: Introductionmentioning

confidence: 99%

Reduced lignin content and altered lignin composition in the warm season forage grass Paspalum dilatatum by down-regulation of a Cinnamoyl CoA Reductase Gene

et al. 2014

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C4 grasses are favoured as forage crops in warm, humid climates. The use of C4 grasses in pastures is expected to increase because the tropical belt is widening due to global climate change. While the forage quality of Paspalum dilatatum (dallisgrass) is higher than that of other C4 forage grass species, digestibility of warm-season grasses is, in general, poor compared with most temperate grasses. The presence of thick-walled parenchyma bundle-sheath cells around the vascular bundles found in the C4 forage grasses are associated with the deposition of lignin polymers in cell walls. High lignin content correlates negatively with digestibility, which is further reduced by a high ratio of syringyl (S) to guaiacyl (G) lignin subunits. Cinnamoyl-CoA reductase (CCR) catalyses the conversion of cinnamoyl CoA to cinnemaldehyde in the monolignol biosynthetic pathway and is considered to be the first step in the lignin-specific branch of the phenylpropanoid pathway. We have isolated three putative CCR1 cDNAs from P. dilatatum and demonstrated that their spatio-temporal expression pattern correlates with the developmental profile of lignin deposition. Further, transgenic P. dilatatum plants were produced in which a sense-suppression gene cassette, delivered free of vector backbone and integrated separately to the selectable marker, reduced CCR1 transcript levels. This resulted in the reduction of lignin, largely attributable to a decrease in G lignin.Electronic supplementary materialThe online version of this article (doi:10.1007/s11248-014-9784-1) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Reduced lignin content and altered lignin composition in the warm season forage grass Paspalum dilatatum by down-regulation of a Cinnamoyl CoA Reductase Gene

et al. 2014

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“…Forage concentrations of ADF in the present study were comparable with values reported elsewhere in the literature, averaging 34.2 and 39.6% in 2007 and 2008, re-spectively, across stocking treatments and 28-d periods. Baréa et al (2007) reported ADF concentrations in dallisgrass of 44.9, 45.8, and 40.6% during spring, summer, and fall, respectively, when forage was clipped at 30-d intervals, and 46.8, 46.1, and 42.4% during spring, summer, and fall, respectively, when clipped at 45-d intervals. Acosta et al (1996) reported concentrations of ADF in dallisgrass of 38.8, 39.7, 35.8, and 31.3% during spring, summer, fall, and winter, respectively.…”

Section: Resultsmentioning

confidence: 98%

Productivity, utilization, and nutritive quality of dallisgrass (Paspalum dilatatum) as influenced by stocking density and rest period under continuous or rotational stocking

Bungenstab

Pereira²,

Lin³

et al. 2011

Journal of Animal Science

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Dallisgrass (Paspalum dilatatum) is well adapted to the Black Belt physiographic region of the southeastern United States, and information on its productivity and nutritive quality as influenced by grazing management is needed. In a 2-yr grazing experiment, replicate 0.40-ha paddocks in established dallisgrass pasture were continuously stocked, or replicate 0.40-ha paddocks were subdivided into two 0.20-ha (RS2), three 0.13-ha (RS3), or four 0.10-ha (RS4) cells and rotationally stocked with yearling beef steers. Individual cells within the RS2, RS3, and RS4 treatments were stocked for 7 d followed by 7, 14, or 21 d of rest, respectively. In 2007, 3 Angus × Simmental crossbred steers (initial BW, 354 ± 6 kg) were assigned randomly to each paddock on July 16; in 2008, 3 Angus × Simmental crossbred steers (initial BW, 310 ± 6 kg) were assigned randomly to each paddock on July 14. In 2007, there was no effect (P = 0.25) of stocking treatment on ADG. Steers grazing RS4, RS2, and continuously stocked paddocks had 106 (P = 0.01), 86 (P = 0.03), and 83 (P = 0.03) kg greater total BW gain per ha, respectively, than steers grazing RS3 paddocks. In 2008, there were no differences among treatments in ADG (P = 0.43) or total BW gain per ha (P = 0.90). Correlation and regression analyses revealed positive associations between steer performance and forage concentration of CP, areal mass (kg/ha) of forage DM, and areal mass of forage CP. Results indicate that productivity and quality of dallisgrass for stocker cattle production were comparable between continuous and rotational-stocking methods.

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“…More recent studies have evaluated extensive collections of these species, particularly P. urvillei (Ferreira et al, 2020;Sawasato et al, 2008) and P. flavescens (Sandro et al, 2019), showing that genetic variability and breeding potential of these species is far greater than initially perceived. Most agronomic characterizations of sexual tetraploids have focused on P. flavescens (Venuto et al, 2003) and P. plurinerve (Baréa et al, 2007;da Costa et al, 2003) probably because they have been considered the most promising and morphologically similar to the well-known and extensively evaluated apomicts. These two biotypes also differ significantly in cycle length (unpublished data) and seed dormancy (Glison et al, 2015).…”

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confidence: 99%

Could the Dilatata group of Paspalum be bred as sexual species? A preliminary assessment

Monteverde

Olveyra

Speranza

2021

Grass and Forage Science

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Apomixis provides a method for cloning plants through seed and it has been viewed as a promising mechanism to enable the exploitation of hybrid vigour and hybrid genotype propagation in seed propagated crops (Hanna & Bashaw, 1987), both for selfing and outcrossing species (Savidan, 2010). For this reason, apomictic reproduction was seen as potentially leading to large increases in agricultural production (Vielle Calzada et al., 1996). In spite of that, in crops that naturally reproduce by apomixis, breeding schemes that are specifically addressed to exploit heterosis have only relatively recently been explicitly proposed, based on those applied to sexual crops like maize (Miles, 2007). The absence of sexual germplasm, particularly at the same ploidy level of the apomictic crop, was in many cases the main cause of this delay. Sexual populations which provide a source of female parents have been synthesized in many cases from artificially obtained polyploid sexual individuals, which allowed to release a wealth of genetic variability from the naturally occurring apomictic germplasm (Miles, 2007;Zilli et al., 2018). The genetic nature of this variability is still being analysed, but at least in some cases, the additive genetic contribution of the sexual plants themselves may be one of the major components (Figueiredo et al., 2019). These strategies show great promise for the onset of continuous breeding programmes for apomictic crops. However, they

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Manejo de Paspalum dilatatum Poir. biótipo Virasoro. 1. Produção, composição química e persistência

Cited by 8 publications

References 11 publications

Reduced lignin content and altered lignin composition in the warm season forage grass Paspalum dilatatum by down-regulation of a Cinnamoyl CoA Reductase Gene

Reduced lignin content and altered lignin composition in the warm season forage grass Paspalum dilatatum by down-regulation of a Cinnamoyl CoA Reductase Gene

Productivity, utilization, and nutritive quality of dallisgrass (Paspalum dilatatum) as influenced by stocking density and rest period under continuous or rotational stocking

Could the Dilatata group of Paspalum be bred as sexual species? A preliminary assessment

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