Chromosome number and plant morphology in some ecotypes of Poa pratensis L.

Speckmann, G. J.; Dijk, G. E. Van

doi:10.1007/bf00036757

Cited by 31 publications

(12 citation statements)

References 8 publications

(3 reference statements)

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“…However, it is likely that these values vary between individuals with each cultivar. These results support previous observations that Kentucky bluegrass has large variations in DNA content (Huff and Bara, 1993; Barcaccia et al, 1997) and in chromosome number (Speckmann and Vandijk, 1972). Interestingly, 91% of the genotypes tested fall in the range of 7 to 13 pg DNA/2C.…”

Section: Resultssupporting

confidence: 92%

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Determination of the Level of Variation in Polyploidy among Kentucky Bluegrass Cultivars by Means of Flow Cytometry

et al. 2004

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search into the genetics of Kentucky bluegrass can be difficult because of a complex genome that can affect Kentucky bluegrass (Poa pratensis L.) is an important cool-season many different variables. For instance, genome size has grass species in the turfgrass and forage industries. Understanding the genetics of Kentucky bluegrass is useful in developing improved adaptive significance and influences phenotype by the cultivars and hybrids. However, studying the genetics of Kentucky expression of its genic content and by the physical effects bluegrass can often be difficult because of the high variation in ploidy of its mass and/or volume (Bennett and Leitch, 1995). In level that results from its facultative apomictic reproductive nature.angiosperms, DNA amount has been shown to correlate Flow cytometry provides an easy and accurate method for assessing with a wide range of important characters such as minithis variation by quantifying DNA content. The purpose of our study mum generation time and ecological behavior. Large was to determine the level of variation in ploidy in Kentucky bluegrass variations in ploidy level exist within and between cultiby analyzing its DNA content using flow cytometry. In addition, DNA vars because of the facultative apomictic nature of recontent was compared with genetic similarity derived from DNA production in Kentucky bluegrass. Therefore, it is not marker data, and was also correlated with chromosome number. possible to assign a specific ploidy level to Kentucky Twenty-two cultivars of Kentucky bluegrass were selected for the study by considering the range of variability in morphological traits bluegrass cultivars. The production of reduced and unand genetic distance derived from DNA marker data. We found that reduced eggs accounts for the differences in chromothe DNA content of Kentucky bluegrass genotypes from the 22 cultisome number. Research has demonstrated that the chrovars ranged from 5.39 to 17.69 pg of DNA/2C and that a majority of mosome number in Kentucky bluegrass can vary from the genotypes had a DNA content value in the range of 7 to 13 pg. 28 to 140, which corresponds to euploid chromosome A significant correlation between DNA content and chromosome numbers with x ϭ 7 (Lö ve and Lö ve, 1975; Barcaccia number was detected. Euploid chromosome numbers (x ϭ 7) with a et al., 1997). range from the pentaploid (2n ϭ 5x ϭ 35) to the quindecaploid (2n ϭ The ability to quickly estimate DNA amount would 15x ϭ 105) were found along with aneuploid numbers. The results facilitate Kentucky bluegrass research by allowing the of this research could aid both breeders and researchers in studying inclusion or exclusion of DNA amount as a variable in the genetics of the species and in improving Kentucky bluegrass cultivars via intra-and interspecific hybridizations.

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Section: Resultssupporting

confidence: 92%

“…However, some level of variation in chromosome number exists within each ploidy level, suggesting that some genotypes in our study may be aneuploids. The observed variation has been reported previously (Speckmann and Vandijk, 1972) and may be attributable to mitotic and meiotic aberrations (Porceddu et al, 2002).…”

Section: Resultssupporting

confidence: 83%

Determination of the Level of Variation in Polyploidy among Kentucky Bluegrass Cultivars by Means of Flow Cytometry

et al. 2004

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“…They continue to exist during the following generations and produce seeds. SPECKMANN and VAN DIJK (1972) studied Poa pratensis collected in various places in the Netherlands and found that the vast majority of plants were aneusomatic, the mean variation in chromosome numbers within the plants was 4. 7 and the maximum deviation was 9.…”

Section: )mentioning

confidence: 99%

Aneusomatyin vivoandin vitroin higher plants

D’Amato

1995

Caryologia

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“…P. pratensis L. (also known as Kentucky bluegrass and in the following denoted as P. pratensis) is an important cool season forage and turf grass that reproduces both sexually, by outcrossing and selfing, and apomictically. The contrasting modes of reproduction facilitate the high polyploidy levels and unusual chromosome numbers (x = 7, 2n = 28-147) observed in P. pratensis (Speckmann and van Dijk, 1972). P. pratensis shows persistence and resilience to cold and seasonal drought (Kanneganti and Kaffka, 1995) and good performance under frequent and close defoliation (Bryan et al, 2000;Durr et al, 2005).…”

Section: Introductionmentioning

confidence: 97%