Genetic Variability of a Forage Bermudagrass Core Collection

Anderson, William F.; Maas, Andrea L.; Ozias‐Akins, Peggy

doi:10.2135/cropsci2008.06.0330

Cited by 28 publications

(38 citation statements)

References 39 publications

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“…Fifty entries with the widest range in rumen digestibility and fiber were selected for the current study (Table 1). The Table 1 Bermuda grass entries and their ranking for high (H), medium (M), or low (L) levels of IVDMD, NDF, ADF, ADL from previous screening, leaf/stem coarseness, and genetic clustering from breeder plots and the Bermuda grass core collection grown at Tifton, GA molecular genetic relationship between these entries was documented using amplified fragment-length polymorphisms (AFLP) [10]. IVDMD was ranked high (>62%), medium (55-62%), or low (<55%).…”

Section: Methodsmentioning

confidence: 99%

Effects of Forage Quality and Cell Wall Constituents of Bermuda Grass on Biochemical Conversion to Ethanol

Anderson¹,

Dien

Jung

et al. 2009

Bioenerg. Res.

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Bermuda grass is an attractive candidate as a feedstock for biofuel production because over four million hectares of Bermuda grass are already grown for forage in the Southern USA. Because both rumen digestion and biochemical conversion to ethanol depend upon enzymatic conversion of the cell wall polysaccharides into fermentable sugars, it is probable that grasses bred for increased forage quality would be more amenable for ethanol production. However, it is not known how variation in rumen digestibility and cell wall/fiber components correlates with efficiency of conversion to ethanol via fermentation. The objective of this research was to determine relationships between ethanol production evaluated by simultaneous saccharification and fermentation (SSF), 72-h in vitro ruminal dry matter digestibility (IVDMD), in vitro ruminal gas production after 24 and 96 h, and biomass composition for 50 genetically diverse Bermuda grass accessions. The Bermuda grass samples were subjected to standard 72-h IVDMD and forage fiber analyses. Also, in separate labs, gas production was measured in sealed volumecalibrated vials after 24 (NNG24) and 96 h (NNG96) of in vitro fermentation by ruminal fluid; ethanol and pentose sugar productions were measured from a bench-top SSF procedure; cell wall constituents were determined by the Uppsala Dietary Fiber Method; and total nitrogen, carbon, and ash concentrations were determined by using the LECO combustion method. Ethanol production was moderately correlated with IVDMD (r=0.55) and NNG96 (r=0.63) but highly correlated with NNG24 (r=0.93). Ethanol was negatively correlated with neutral detergent fiber (NDF; r=−0.53) and pentose sugars (r=−0.60), but not correlated with glucose content. Regression models indicated that NDF and cell wall pentose sugar concentrations had significant negative effects on ethanol production. Variation among entries for IVDMD was affected by variability of NDF, pentose sugar concentrations, and biomass nitrogen content. Variation in Klason lignin content had only minor negative impacts on ethanol production and IVDMD. Biochemical conversion efficiency of Bermuda grass by SSF can be best estimated by NNG24 but not by IVDMD.

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Section: Methodsmentioning

confidence: 99%

Effects of Forage Quality and Cell Wall Constituents of Bermuda Grass on Biochemical Conversion to Ethanol

Anderson¹,

Dien

Jung

et al. 2009

Bioenerg. Res.

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“…Previous population structure analyses of the international collection have also found that species did not form discrete clusters. This was reportedly due to mis-naming of accessions prior to Harlan et al's (1970) revision of the genus, contamination among nursery plots since establishment of the collection in the 1940's, and taxonomic confusion during species classification (Anderson et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…DNA extraction procedures and EST-SSR analyses have been reported previously (Jewell et al 2010;Kearns et al 2009;Zhou et al 2009). DNA from 59 international accessions representing global distribution was provided by the USDA-ARS in Tifton, GA (international collection; IC; Anderson et al 2009). These accessions were a subset of a core collection of 600 accessions maintained at the Crop Genetic and Breeding Research Unit (USDA-ARS Coastal Plain Experiment Station, Tifton, GA, USA).…”

Section: Plant Materials Est-ssr Genotyping and Core Collection Devementioning

confidence: 99%

Introduction and Adaptation of Cynodon L. C. Rich Species in Australia

Jewell

Anderson

Loch

et al. 2012

Breeding Strategies for Sustainable Forage and Turf Grass Improvement

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Cynodon L. C. Rich comprises warm season grass species that are valuable as turf and forage in warm climates across the globe. Traditionally, Cynodon breeding programs have aimed to produce varieties with improved turf and forage grass quality characteristics. More recent goals, such as improved abiotic stress tolerance, aim to address challenges associated with climate change. Germplasm collections representing a fraction of the global distribution of Cynodon comprise the plant resource for these breeding programs. We compared a core collection consisting of 116 Australian genotypes with an international core collection of 59 genotypes representing Cynodon's global distribution. Our aims were to determine whether unique genetic diversity exists amongst Australian Cynodon that may enhance international breeding resources. This research will facilitate the incorporation of Australian Cynodon genetic resources, which have expanded and naturalized under harsh Australian climates, into existing germplasm collections.

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“…Pers.) genotypes bred for high dry biomass yield produced twice as much as unimproved genotypes and recent yield trials indicated that switchgrass yields were 50% greater than those achieved in early 2000 [293]. Therefore, instant determination of net energy value is a valuable tool for plant breeders and growers to tailor genotypic development, hybrid selection, and crop management to produce the highest dry biomass yield [288].…”

Section: Genetics Breeding Transgenics and Carbon Sequestrationmentioning

confidence: 99%

“…Therefore, the cereal ideotype was phenotypically characterized by a short stem, small erect leaves, a low number of tillers, and a large and awned ear. As yield is a property of a population of plants and is poorly correlated with the performance of an individual plant in the population [118,183,245,251,293], the cereal crop ideotype was designed to be a weak competitor to reduce intra-crop interference and thereby maximize yield per unit area. Advancing appropriate genetic models for bioenergy crops is indispensable in the development of agroecosystem approaches to improve several traits related to dry biomass yield and bioenergy production, and to enhance global climate change adaptation and mitigation.…”

Section: Genetic Models and Ideotypes Of Bioenergy Cropsmentioning

confidence: 99%

Can Carbon in Bioenergy Crops Mitigate Global Climate Change?

Jaradat

2013

Climate Change and Plant Abiotic Stress Tolerance

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Different forms of carbon (C) cycle continuously through several pools in natural and managed ecosystems and spheres. Carbon's recent "commodification," as a negative environmental externality, has rendered it a "scarce" and "tradable" element. Although C supply in nature is not limited, energy is required to make it available as a plant nutrient, assimilate it in plant tissues, and sequester it as temporary or recalcitrant C in soils. Human demand for C-based energy and plantfixed C has accelerated, and altered its global cycle, raised its atmospheric content, contributed to climate change through global warming, and impacted several provisioning, regulating, and supporting ecosystem services. Agroecosystems are both sources and sinks of C. In a carbon dioxide-constrained world, plant-fixed and sequestered C in natural and managed ecosystems has a potential role in mitigating climate change, providing C-neutral and renewable bioenergy, and positively affecting ecosystem services. Due to the intricacies of the complex, interconnected biogeochemical cycles involving C, nitrogen, and water in which soils play an important role, bioenergy crops do not provide an easy solution to climate change mitigation, they may contribute to it. This chapter presents a critical review assessing the state of knowledge, and exploring opportunities and challenges of the role of C in bioenergy crops in mitigating global climate change, while sustainably providing other ecosystem services.

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Genetic Variability of a Forage Bermudagrass Core Collection

Cited by 28 publications

References 39 publications

Effects of Forage Quality and Cell Wall Constituents of Bermuda Grass on Biochemical Conversion to Ethanol

Effects of Forage Quality and Cell Wall Constituents of Bermuda Grass on Biochemical Conversion to Ethanol

Introduction and Adaptation of Cynodon L. C. Rich Species in Australia

Can Carbon in Bioenergy Crops Mitigate Global Climate Change?

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