Breeding perennial grasses for forage usage: An experimental assessment of trait changes in diploid perennial ryegrass (Lolium perenne L.) cultivars released in the last four decades

Sampoux, Jean‐Paul; Baudouin, Pierre; Bayle, B.; Beguier, Vincent; Bourdon, Pascal; Chosson, Jean-François; Deneufbourg, F.; Galbrun, C.; Ghesquière, Marc; Noël, D.; Pietraszek, W.; Tharel, B.; Viguié, Anne

doi:10.1016/j.fcr.2011.05.007

Cited by 80 publications

(88 citation statements)

References 46 publications

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“…In a similar study undertaken by Sampoux et al (2011) over 40 years, gains in DM yield achieved in diploid perennial ryegrass varieties released on European National lists were assessed and it was shown that significant gains in all three primary production traits DM yield, persistency and quality can be achieved simultaneously. This study was comparing gains in 21 registered varieties bred for National lists compared to seven natural populations collected in natural meadows.…”

Section: Discussionmentioning

confidence: 99%

“…While overall DM yield gain is significant across varieties registered on RLs over the past 40 years, gains in DM production in pasture deficit periods such as spring and autumn may well be viewed of higher economic value by farmers for commercial use especially as pasture performance comes under increased pressure due to limitations in land availability and environmental constraints in the future (Parsons et al 2011), Sampoux et al (2011 identified over 40 years, gains in DM yield of perennial ryegrass varieties released on European National lists were primarily in the summer and autumn but no gain was achieved in spring DM yield production where pasture supplementation requirements are at their highest. Gain in DM yield may very well need to be assessed on such pasture growth deficit periods in the year to ensure farmers are reaping maximum economic benefit from newly bred recommended varieties.…”

Section: Discussionmentioning

confidence: 99%

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Genetic gain in perennial ryegrass (Lolium perenne) varieties 1973 to 2013

et al. 2016

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Perennial ryegrass (Lolium perenne) forms the basis of grassland production in temperate pastures and is globally one of the most important forage grasses. Consequently, there has been large plant breeding industry investment over the past 40 years in producing new varieties and independent testing systems designed to identify and list those with the most improved performances. This study was conducted at the Plant Testing Station, Crossnacreevy, Northern Ireland and compared the DM yield and sward density of new varieties submitted from 1973 to 2013 and grass digestibility from 1980 to 2013, under conservation and simulated grazing managements. A variety 9 years matrix was compiled for each parameter and comparable means between varieties never in side by side performance trials were produced. Dry matter yields showed an overall significant (p \ 0.001) average annual increase of 0.52 % under conservation and 0.35 % under simulated grazing, with similar gain levels within maturity groups or ploidies. These rates were not constant over time, and periods of no gain occurred in various variety groupings. Sward density of the examined varieties did not change significantly. Herbage digestibility showed no improvement over the timeframe but had the largest differences between concurrent varieties, indicating that improvements were possible in the future. The study indicated that plant breeding gains were primarily DM yield focused with sward density remaining stagnant over the 40 years, while the lack of grass digestibility improvement appeared to only require more time to overcome. Evidence of benefits and risks of variety testing influences on plant breeding objectives was discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Genetic gain in perennial ryegrass (Lolium perenne) varieties 1973 to 2013

et al. 2016

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“…Nevertheless, yield improvement should be possible by extending the harvesting season (early or late) as has been observed in perennial ryegrass (Lolium perenne) [24], or by extending the harvest interval, if nutritive value could be improved concurrently. The pooling of diverse germplasms had the associated effect of maximizing heterozygosity [23].…”

Section: Biomass Yieldmentioning

confidence: 99%

Applied Genetics and Genomics in Alfalfa Breeding

2012

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Alfalfa (Medicago sativa L.), a perennial and outcrossing species, is a widely planted forage legume for hay, pasture and silage throughout the world. Currently, alfalfa breeding relies on recurrent phenotypic selection, but alternatives incorporating molecular marker assisted breeding could enhance genetic gain per unit time and per unit cost, and accelerate alfalfa improvement. Many major quantitative trait loci (QTL) related to agronomic traits have been identified by family-based QTL mapping, but in relatively large genomic regions. Candidate genes elucidated from model species have helped to identify some potential causal loci in alfalfa mapping and breeding population for specific traits. Recently, high throughput sequencing technologies, coupled with advanced bioinformatics tools, have been used to identify large numbers of single nucleotide polymorphisms (SNP) in alfalfa, which are being developed into markers. These markers will facilitate fine mapping of quantitative traits and genome wide association mapping of agronomic traits and further advanced breeding strategies for alfalfa, such as marker-assisted selection and genomic selection. Based on ideas from the literature, we suggest several ways to improve selection in alfalfa including (1) diversity selection and paternity testing, (2) introgression of QTL and (3) genomic selection.

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“…In contrast to the thousands of years of breeding effort in annual grasses, such as wheat, barley, and rice, perennial grass breeding is not even a century old [50]. Nevertheless, important improvements in yield potential, persistency and disease resistance, as well as feeding value-through increased water-soluble carbohydrate content, for example-have been achieved [51,52]. The allogamous nature of this species, due to its highly effective gametophytic self-incompatibility system [53], has, until now, restricted breeding to the population level, resulting in marked genetic diversity and heterozygosity within cultivars [54].…”

Section: Perennial Ryegrass Breedingmentioning

confidence: 99%

“…Commonly cited causes for this relatively slow progress, calculated as an increase in dry matter yield of just 3.2% per decade [51], are (1) the longer breeding cycle of perennial forage crops; (2) the absence of a harvest index trait to facilitate partitioning of dry matter into the marketed product; (3) a lack of commercial exploitation of heterosis; (4) a focus on breeding for other traits than yield, such as resistance to crown rust (Puccinia coronata), reduced aftermath heading and early spring growth [56]. In effect, the modest yield increases in perennial ryegrass are most likely due to constraints stemming from life history traits and the techniques available to forage breeders rather than physiological limitations or lack of genetic variation [51]. If genetic gains are to be improved, it is, therefore, imperative to expand the arsenal of breeding tools, as well as to find ways of working with, or around, the characteristic life cycle of perennial ryegrass.…”

Section: Perennial Ryegrass Breedingmentioning

confidence: 99%

Haploid and Doubled Haploid Techniques in Perennial Ryegrass (Lolium perenne L.) to Advance Research and Breeding

2016

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Abstract:The importance of haploid and doubled haploid (DH) techniques for basic and applied research, as well as to improve the speed of genetic gain when applied in breeding programs, cannot be overstated. They have become routine tools in several major crop species, such as maize (Zea mays L.), wheat (Triticum aestivum L.), and barley (Hordeum vulgare L.). DH techniques in perennial ryegrass (Lolium perenne L.), an important forage species, have advanced to a sufficiently successful and promising stage to merit an exploration of what their further developments may bring. The exploitation of both in vitro and in vivo haploid and DH methods to (1) purge deleterious alleles from germplasm intended for breeding; (2) develop mapping populations for genetic and genomic studies; (3) simplify haplotype mapping; (4) fix transgenes and mutations for functional gene validation and molecular breeding; and (5) hybrid cultivar development are discussed. Even with the comparatively modest budgets of those active in forage crop improvement, haploid and DH techniques can be developed into powerful tools to achieve the acceleration of the speed of genetic gain needed to meet future agricultural demands.

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Breeding perennial grasses for forage usage: An experimental assessment of trait changes in diploid perennial ryegrass (Lolium perenne L.) cultivars released in the last four decades

Cited by 80 publications

References 46 publications

Genetic gain in perennial ryegrass (Lolium perenne) varieties 1973 to 2013

Genetic gain in perennial ryegrass (Lolium perenne) varieties 1973 to 2013

Applied Genetics and Genomics in Alfalfa Breeding

Haploid and Doubled Haploid Techniques in Perennial Ryegrass (Lolium perenne L.) to Advance Research and Breeding

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