Meiosis of triploid Lolium. II. Discrepancies between the analyses of chromosome configurations at metaphase I in inverse autoallotriploid combinations

Thomas, Hugh

doi:10.1038/hdy.1995.160

Cited by 11 publications

(15 citation statements)

References 13 publications

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“…Lolium temulentum has 50% more DNA than L. multiflorum (Hutchinson et al, 1983). Thomas (1995) studied the inverse triploid hybrids of L. temulentum (T) L. multiflorum (M). The combinations studied were: one large genomeǹtwo small genomes (TMM) and two large genomesǹone small genome (TTM).…”

Section: Resultsmentioning

confidence: 99%

Introgression mapping in the grasses. II. Meiotic analysis of the Lolium perenne/Festuca pratensis triploid hybrid

et al. 1999

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Lolium perenne/Lolium perenne/Festuca pratensis triploid hybrids are a potentially important source of material for determining the genetic control of agronomically and scientifically important characters and determining how genetic maps relate to physical maps. The evolutionary relationship between L. perenne (Lp) and F. pratensis (Fp) is, however, unclear. In order to determine the genomic relationships between Lp and Fp, genomic in situ hybridization (GISH) and the Chapman and Kimber mathematical model (1992) were used to analyse metaphase I in meiocytes of an LpLpFp triploid hybrid. Both analyses clearly demonstrated that recombination occurs preferentially between the homologous Lp genomes in the LpLpFp triploid, indicating that the genomes of the two species have diverged. Direct analysis of homologous vs. homoeologous chromosome association, as measured by GISH, was in broad agreement with the mathematical analysis. It is therefore concluded that the Chapman and Kimber model (1992) is a valid means of assessing chromosome pairing in these triploid hybrids. The significance of the data for elucidating the closeness of the relationship of L. perenne and F. pratensis is discussed.

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Section: Resultsmentioning

confidence: 99%

Introgression mapping in the grasses. II. Meiotic analysis of the Lolium perenne/Festuca pratensis triploid hybrid

et al. 1999

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“…Evidence for this finding comes from studies of crosses between annuals and perennials of the genus Lolium spp. (Thomas, 1995). Similarly, a single chromosome addition from the perennial plant Thinopyrum elongatum is sufficient to confer a perennial growth habit to annual wheat (Lammer et al, 2004).…”

Section: Roots Of Perennialitymentioning

confidence: 99%

Perennial Roots to Immortality ,

Munné‐Bosch

2014

Plant Physiology

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Maximum lifespan greatly varies among species, and it is not strictly determined; it can change with species evolution. Clonal growth is a major factor governing maximum lifespan. In the plant kingdom, the maximum lifespans described for clonal and nonclonal plants vary by an order of magnitude, with 43,600 and 5,062 years for Lomatia tasmanica and Pinus longaeva, respectively. Nonclonal perennial plants (those plants exclusively using sexual reproduction) also present a huge diversity in maximum lifespans (from a few to thousands of years) and even more interestingly, contrasting differences in aging patterns. Some plants show a clear physiological deterioration with aging, whereas others do not. Indeed, some plants can even improve their physiological performance as they age (a phenomenon called negative senescence). This diversity in aging patterns responds to species-specific life history traits and mechanisms evolved by each species to adapt to its habitat. Particularities of roots in perennial plants, such as meristem indeterminacy, modular growth, stress resistance, and patterns of senescence, are crucial in establishing perenniality and understanding adaptation of perennial plants to their habitats. Here, the key role of roots for perennial plant longevity will be discussed, taking into account current knowledge and highlighting additional aspects that still require investigation.

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“…F. donax (LmLmFd) and L. multiflorum ! L. temulentum (Morgan, 1990;Thomas, 1995). Cao et al (2000) found one quadrivalent in a triploid F1 L. perenne !…”

Section: Molecular Cytogeneticsmentioning

confidence: 99%

“…L. perenne (LmLmLp) indicated that some chromosomes may have a greater potential to pair preferentially than others. By analyzing meiosis in triploid L. multiflorum plants, Thomas (1995) determined chromosome 2 to have fewer partner exchanges than other chromosomes. Armstead et al (2001) explained different recombination frequencies of two different chromosomes of F. pratensis substituted into diploid L. perenne by differences in chromosome affinity, different innate recombination frequencies, by the sampling effect, or environmental and/or genetic factors.…”

Section: Molecular Cytogeneticsmentioning

confidence: 99%

Cytogenetics of Festulolium (<i>Festuca </i>×<i> Lolium</i> hybrids)

Kopecký

Lukaszewski

Doležel

2008

Cytogenet Genome Res

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Grasses are the most important and widely cultivated crops. Among them, ryegrasses (Lolium spp.) and fescues (Festuca spp.) provide high quality fodder for livestock, are used for turf and amenity purposes, and play a fundamental role in environment protection. Species from the two genera display complementary agronomic characteristics and are often grown in mixtures. Breeding efforts to combine desired features in single entities culminated with the production of Festuca × Lolium hybrids. The so called Festuloliums enjoy a considerable commercial success with numerous cultivars registered all over the world. They are also very intriguing from a strictly cytogenetic point of view as the parental chromosomes recombine freely in hybrids. Until a decade ago this phenomenon was only known in general quantitative terms. The introduction of molecular cytogenetic tools such as FISH and GISH permitted detailed studies of intergeneric chromosome recombination and karyotyping of Festulolium cultivars. These tools were also invaluable in revealing the origin of polyploid fescues, and facilitated the development of chromosome substitution and introgression lines and physical mapping of traits of interest. Further progress in this area will require the development of a larger set of cytogenetic markers and high-resolution cytogenetic maps. It is expected that the Lolium – Festuca complex will continue providing opportunities for breeding superior grass cultivars and the complex will remain an attractive platform for fundamental research of the early steps of hybrid speciation and interaction of parental genomes, as well as the processes of chromosome pairing, elimination and recombination.

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Meiosis of triploid Lolium. II. Discrepancies between the analyses of chromosome configurations at metaphase I in inverse autoallotriploid combinations

Cited by 11 publications

References 13 publications

Introgression mapping in the grasses. II. Meiotic analysis of the Lolium perenne/Festuca pratensis triploid hybrid

Introgression mapping in the grasses. II. Meiotic analysis of the Lolium perenne/Festuca pratensis triploid hybrid

Perennial Roots to Immortality ,

Cytogenetics of Festulolium (<i>Festuca </i>×<i> Lolium</i> hybrids)

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