Lolium edwardii sp. nova (Gramineae) and its relationship with Schedonorus sect. Plantynia Dumort.

Scholz, H.; Stierstorfer, Ch.; Gaisberg, Markus Von

doi:10.1002/fedr.20001110722

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…The genus Lolium comprises nine species representing both outbreeding and inbreeding species (Terrell, 1968; Scholz et al, 2000), of which the most commonly used species are Lolium perenne L. (perennial ryegrass) and Lolium multiflorum L. (Italian ryegrass or annual ryegrass). These two species produce high yields, are widely adaptable, and have high nutritional value; they are the most important pasture-grass species for cool temperate grassland agriculture, with large areas of cultivation in the British Isles, Denmark, Northern Europe, New Zealand, Southeastern Australia, and other countries (Guthridge, 2001).…”

Section: Introductionmentioning

confidence: 99%

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Guan

Yuyama²,

Stewart³

et al. 2017

Front. Plant Sci.

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To assess the genetic diversity and population structure of Lolium species, we used 32 nuclear simple sequence repeat (SSR) markers and 7 cytoplasmic gene markers to analyze a total of 357 individuals from 162 accessions of 9 Lolium species. This survey revealed a high level of polymorphism, with an average number of alleles per locus of 23.59 and 5.29 and an average PIC-value of 0.83 and 0.54 for nuclear SSR markers and cytoplasmic gene markers, respectively. Analysis of molecular variance (AMOVA) revealed that 16.27 and 16.53% of the total variation was due to differences among species, with the remaining 56.35 and 83.47% due to differences within species and 27.39 and 0% due to differences within individuals in 32 nuclear SSR markers set and 6 chloroplast gene markers set, respectively. The 32 nuclear SSR markers detected three subpopulations among 357 individuals, whereas the 6 chloroplast gene markers revealed three subpopulations among 160 accessions in the STRUCTURE analysis. In the clustering analysis, the three inbred species clustered into a single group, whereas the outbreeding species were clearly divided, especially according to nuclear SSR markers. In addition, almost all Lolium multiflorum populations were clustered into group C4, which could be further divided into three subgroups, whereas Lolium perenne populations primarily clustered into two groups (C2 and C3), with a few lines that instead grouped with L. multiflorum (C4) or Lolium rigidum (C6). Together, these results will useful for the use of Lolium germplasm for improvement and increase the effectiveness of ryegrass breeding.

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Section: Introductionmentioning

confidence: 99%

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Guan

Yuyama²,

Stewart³

et al. 2017

Front. Plant Sci.

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“…Due to the close affinity, the two groups are collectively referred to as the Festuca-Lolium or Lolium-Festuca complex (Kopeck y et al 2009, Hand et al 2010. The Lolium genus contains 10 species (Terrell 1968, Scholz et al 2000, Scholz and Scholz 2005, which are native to Europe, Asia and Northern Africa, as well as being cultivated and naturalized throughout temperate regions of the world (Hubbard 1954). Lolium perenne (perennial ryegrass) and Lolium multiflorum (Italian ryegrass) are economically important for pastures and have also been used for turf and lawn purposes.…”

Section: Properties Of Ryegrassesmentioning

confidence: 99%

Prospects for applications of genomic tools in registration testing and seed certification of ryegrass varieties

2016

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The ryegrass (Lolium) species, perennial ryegrass (Lolium perenne L.) and Italian ryegrass (Lolium multiflorum Lam.), are the two most important pasture grass species for global temperate regions and are also useful for amenity purposes. Due to an outbreeding reproductive habit, high levels of genetic heterogeneity are present within cultivated varieties. A continual increase in delivery of new cultivars to the marketplace, along with limited capacity to discriminate on the basis of morphological characteristics in a grow-out test, has caused difficulties for distinctness, uniformity and stability (DUS) testing in the current plant variety protection (PVP) system. A range of genomic tools and resources have been generated for ryegrasses, which provide new opportunities and challenges to the current PVP system. In this review, the currently available genomic tools and resources are described, along with prospects for applications to the PVP system and testing for seed certification and purity accreditation.

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“…The genus Lolium is composed of nine species that are classified into an outcrossing group and an inbreeding group (Terrell 1968;Clayton and Renvoize 1986;Scholz et al 2000). Two major species in the outcrossing group, Italian ryegrass (Lolium multiflorum Lam.)…”

Section: Introductionmentioning

confidence: 99%

Exceptionally high fertility observed in three F₁ hybrids between Lolium multiflorum Lam. and L. temulentum L.

et al. 2012

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The pollen fertility and seed set of three F1 hybrid plants derived from a cross between a darnel ryegrass (Lolium temulentum L.) line (Ba3081) and a genotype of Italian ryegrass (L. multiflorum Lam.) were evaluated in field and greenhouse experiments under different temperatures. In the field where the daily mean temperature for 3 weeks prior to pollen dispersal was 16.5°C, the mean pollen fertility of the F1 plants was 42.8%, which was lower than the value observed in the parental species (96.0–98.1%). In two greenhouses with a daily mean temperature of 20.4 and 15.8°C, the mean pollen fertility of the F1 plants was 53.1% and 44.0%, respectively, which were higher than the values reported previously for the hybrids between L. temulentum × L. multiflorum (maximum of about 20%). The seed set of the F1 plants was 24% under open‐pollinated conditions in the field compared with 4.2–8.8% under self‐pollinated conditions in the two greenhouses. These results indicated that the F1 plants were self‐fertile and able to set F2 seed, with a significant reduction in pollen fertility occurring with a decrease in the daily mean temperature (2.15% decrease in fertility per unit decrease in temperature). The germination rate of the F2 seeds was approximately 57%, indicating the possibility of producing an F2 population for future genetic analysis. This is the first report of F1 plants from L. temulentum × L. multiflorum with fertile pollen and with the ability to produce progeny by self‐pollination. These findings suggest a possibility of developing recombinant inbred lines between L. temulentum and L. multiflorum.

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Lolium edwardii sp. nova (Gramineae) and its relationship with Schedonorus sect. Plantynia Dumort.

Cited by 14 publications

References 5 publications

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Prospects for applications of genomic tools in registration testing and seed certification of ryegrass varieties

Exceptionally high fertility observed in three F₁ hybrids between Lolium multiflorum Lam. and L. temulentum L.

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Lolium edwardii sp. nova (Gramineae) and its relationship with Schedonorus sect. Plantynia Dumort.

Cited by 14 publications

References 5 publications

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Genetic Diversity and Structure of Lolium Species Surveyed on Nuclear Simple Sequence Repeat and Cytoplasmic Markers

Prospects for applications of genomic tools in registration testing and seed certification of ryegrass varieties

Exceptionally high fertility observed in three F1 hybrids between Lolium multiflorum Lam. and L. temulentum L.

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Product

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Exceptionally high fertility observed in three F₁ hybrids between Lolium multiflorum Lam. and L. temulentum L.