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Amanda J. Hershberger, Tracie M. Jenkins, and Carol Robacker

indigenous to the southeastern United States: S. marilandica and the federally endangered Spigelia gentianoides ( Gould, 1997 ). To aid recovery of S. gentianoides , research on the genetic variability of the natural populations of this species has been

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Enrique I. Sánchez-González, Adriana Gutiérrez-Díez, and Netzahualcóyotl Mayek-Pérez

genotypes. Therefore, the objective of this study was to assess the outcrossing rate and genetic variability in progenies of Mexican race avocado genotypes by SSR and ISSR markers, which will enable the establishment of new strategies for the conservation

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Yeun-Kyung Chang, Richard E. Veilleux, and Muhammad Javed Iqbal

hybrids for market demands. Despite the economic importance of Phalaenopsis , the genetic potential of Phalaenopsis has not been fully exploited. An assessment of genetic variability is important for the use of genetic resources and for determining

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Mirko Siragusa, Fabio De Pasquale, Loredana Abbate, Letizia Martorana, and Nicasio Tusa

at genetic improvement. Currently in Sicily, there are several lemon landraces with interesting agronomic traits, but little information is available about their genetic variability. Until now, Sicilian lemon characterization has been done only

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Rolland Agaba, Phinehas Tukamuhabwa, Patrick Rubaihayo, Silver Tumwegamire, Andrew Ssenyonjo, Robert O.M. Mwanga, Jean Ndirigwe, and Wolfgang J. Grüneberg

bioavailability of products processed from yam beans merit further research. More information on Fe in yam bean is required to determine if this trait merits breeding effort. Literature Cited Abinasa, M. Ayana, A. Bultosa, G. 2011 Genetic variability, heritability

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Abe Shegro Gerrano, Patrick Olusanmi Adebola, Willem Sternberg Jansen van Rensburg, and Sonja Louise Venter

, however, requires information on the genetic variability that exists among available germplasm. Information on the genetic heritability and genetic advance of the targeted traits is also important for efficient selection. This study was therefore carried

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Emmanouil N. Tzitzikas, Antonio J. Monforte, Abdelhak Fatihi, Zacharias Kypriotakis, Tefkros A. Iacovides, Ioannis M. Ioannides, and Panagiotis Kalaitzis

secondary centers of diversity. Apart from the significant amount of genetic variability observed among melon germplasm, occidental modern melon cultivars have a relatively narrow genetic base because they belong to a limited number of varietas (mainly

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Arthur Q. Villordon and Don R. LaBonte

Our research examined whether plants originating from adventitious sprouts from fleshy sweetpotato roots are genetically more variable than plants that arise from pre-existing meristematic regions, i.e., nodes. Our study compared one plant each of `Jewel', `Sumor', and L87-95 clonally propagated for seven generations both nodally and through adventitious sprouts. PCR-based analysis of 60 samples (10 nodal and 10 adventitiously derived plants/genotype) showed 20% polymorphism among adventitious materials vs. 6% among nodally derived plants. An “analysis of molecular variance” showed that differences between propagation methods accounted for 30% of the total marker variability. Our results support previous findings that, relative to non-meristematic materials, meristematic regions strictly control cell division and DNA synthesis that exclude DNA duplication and other irregularities.

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Maria Susana Lopes, Duarte Mendonça, Kristina M. Sefc, Fabíola Sabino Gil, and Artur da Câmara Machado

A collection of 130 olive samples, originating from diverse areas in Europe and corresponding to 67 different cultivars denominations, was genotyped at 14 microsatellite loci. In total, 135 alleles with a mean number of 9.6 alleles per locus were detected. All but 30 accessions showed unique genotypes. Several cases of synonymy listed in the FAO database of olive germplasm could not be confirmed, as different allelic profiles were obtained from putatively synonymous cultivars. The existence of homonyms or mislabeled samples in olive germplasm collections was evidenced by allele differences of up to 60% between samples of the same denomination. An allele-sharing phenogram of the analyzed genotypes revealed several cultivars with high levels of intra-varietal polymorphism, as well as cultivar families consisting of closely related cultivars with similar denominations. Our work shows that the current designations of olive cultivars fall short of describing the genetic variability among economically important plant material. A thorough investigation of the existing variability will prove of major importance for both management and economic production of olive trees.

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Long Ma, Kevin E. Kenworthy, Huangjun Lu, and Ronald Cherry

heritability estimates of common carpetgrass Crop Sci. 48 2017 2025 Greene, N. Kenworthy, K. Quesenberry, K. Unruh, J. Sartain, J. 2008b Diversity and relatedness of common carpetgrass germplasm Crop Sci. 48 2298 2304 Hallauer, A.R. 1970 Genetic variability for