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Jie Fu, Qiaoyan Xiang, Xianbao Zeng, Mei Yang, Ying Wang, and Yanling Liu

cultivars by molecular methods is necessary. In recent years, the rapid development of molecular marker technologies and DNA fingerprinting analysis has provided new techniques to assess the genetic diversity of plants and animals such as random amplified

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Jacob Mashilo, Hussein Shimelis, Alfred Odindo, and Beyene Amelework

for desired traits, which relies on the available genetic diversity ( Smith et al., 1991 ). Phenotypic markers have been used to characterize and evaluate bottle gourd genetic resources, which employed various descriptor lists of morphoagronomic traits

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P. Escribano, M.A. Viruel, and J.I. Hormaza

/tolerance to fruit flies of the genera Ceratitis MacLeay and Anastrepha Schiner. Increasing concerns on reduced levels of genetic diversity in crop species ( Esquinas-Alcazar, 2005 ; Tanksley and McCouch, 1997 ) have led to the need to preserve as much

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Mozhgan Zangeneh and Hassan Salehi

. tazetta is primarily found in Spain and northern Africa, as well as in a narrow band within China and Japan. The development of effective conservation and management strategies requires a thorough understanding of the genetic diversity and relationships

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Shuiming Zhang, Zhongshan Gao, Changjie Xu, Kunsong Chen, Guoyun Wang, Jintu Zheng, and Ting Lu

appearance, flavor, and mouth feel ( Joyce, 2007 ; Karp, 2007 , 2008 ). Chinese bayberry is a fruit with a long cultivation history of over 2000 years, but with only a three-decade-long research history. Its genetic diversity is far from being well

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Laura Rodriguez-Uribe, Luz Hernandez, James P. Kilcrease, Stephanie Walker, and Mary A. O’Connell

carotenoid pathways. Genetic diversity in landraces of Capsicum in Mexico ( Aguilar-Melendez et al., 2009 ; Gonzalez-Jara et al., 2011 ; Pacheco-Olvera et al., 2012 ) and in Capsicum in home gardens in Guatemala ( Guzman et al., 2005 ) has been

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David Jesús Gil-Ariza, Iraida Amaya, José Manuel López-Aranda, José Federico Sánchez-Sevilla, Miguel Ángel Botella, and Victoriano Valpuesta

the analysis of population structure in polyploids. Only very recently was information on genetic diversity in F. virginiana and F. chiloensis populations provided ( Carrasco et al., 2007 ; Hokanson et al., 2006 ). This is most likely the result

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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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Diego Fajardo, Don R. La Bonte, and Robert L. Jarret

The USDA gene bank currently maintains 668 accessions of cultivated sweetpotato and 219 accessions of related Ipomoea species. Information on the genetic diversity of the collection does not exist due to funding constraints. The development of a core collection would provide a subset of accessions that represent the genetic diversity of the main collection with a minimum of repetitiveness. The small size of the core collection would facilitate the evaluation of the accessions for economically important traits. The objective of this research is to develop a core collection of Papua New Guinea sweetpotato germplasm using the Amplified Fragment Length Polymorphisms (AFLPs) marker system. This approach to quantifying genetic diversity would later serve as a model for the development of a USDA sweetpotato germplasm core collection. The germplasm choosen for this study was collected from this crop's secondary center of genetic diversity based on its potential as a source of new traits. All genotypes were fingerprinted using four primer combinations that generated 224 markers. The molecular data was then analyzed using NTSYSpc 2.0 program to determine the relatedness of the genotypes. The molecular analysis showed a homogeneous genetic constitution. The extent of diversity among accessions was correlated with the geographic origin of the plant material.

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Diego Fajardo, Don R. La Bonte, and Robert L. Jarret

The USDA gene bank currently maintains 668 accessions of cultivated sweetpotato and 219 accessions of related Ipomoea species. Information on the genetic diversity of the collection does not exist due to funding constraints. The development of a core collection would provide a subset of accessions that represent the genetic diversity of the main collection with a minimum of repetitiveness. The small size of the core collection would facilitate the evaluation of the accessions for economically important traits. The objective of this research is to develop a core collection of Papua New Guinea sweetpotato germplasm using the Amplified Fragment Length Polymorphisms (AFLPs) marker system. This approach to quantifying genetic diversity would later serve as a model for the development of a USDA sweetpotato germplasm core collection. The germplasm choosen for this study was collected from this crop's secondary center of genetic diversity based on its potential as a source of new traits. All genotypes were fingerprinted using four primer combinations that generated 224 markers. The molecular data was then analyzed using NTSYSpc 2.0 program to determine the relatedness of the genotypes. The molecular analysis showed a homogeneous genetic constitution. The extent of diversity among accessions was correlated with the geographic origin of the plant material.