Production of Eucommia-rubber from Eucommia ulmoides Oliv. (Hardy Rubber Tree)

ABSTRACT. Sequence-related amplified polymorphism (SRAP), amplified fragment length polymorphism (AFLP), and inter-simple sequence repeat (ISSR) markers were used to estimate the genetic diversity and relationships among Eucommia ulmoides cultivars in China. A total of 240, 192, and 150 DNA fragments were detected by 10 SRAP primer combinations, 10 AFLP primer combinations, and 10 ISSR primers, among which 89.2, 65.1, and 88.0% of the fragments were polymorphic, respectively. Cluster analysis revealed that Qinzhong No. 3, Xiaoyeci, Qinzhong No. 1, and Qinzhong No. 2 formed independent clusters. The other 15 cultivars exhibited two clusters. The results of this study will help in the selection of parents for both genome mapping and crossbreeding purposes.

Section: Introductionmentioning

confidence: 99%

Genetic diversity and relationships among Chinese Eucommia ulmoides cultivars revealed by sequence-related amplified polymorphism, amplified fragment length polymorphism, and inter-simple sequence repeat markers

Wang

et al. 2014

“…These constituents have high pharmacological activities and health care functions, such as lowering blood pressure (Kwan et al, 2004) and sugar (Lee et al, 2005), antioxidant (Hsieh and Yen, 2000), and anti-mutation (Nakamura et al, 1997). Eucommia rubber, obtained from the seeds, bark, and leaves, is a hard rubber with thermoplasticity, and it has properties that are similar to those of plastic (Nakazawa et al, 2009). The E. ulmoides male flower is abundant in bioactive constituents, and it is suitable to be developed as a health-care flower tea (Dong et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Relationship between progeny growth performance and molecular marker-based genetic distances in Eucommia ulmoides parental genotypes

Wei

et al. 2014

ABSTRACT. Progeny performances, variations and combining abilities for growth traits were evaluated in a factorial mating design of Eucommia ulmoides. Three marker systems, sequence-related amplified polymorphism, amplified fragment length polymorphism, and intersimple sequence repeat, were used to determine genetic distances between parents. Correlations of genetic distances with progeny performances, within-family coefficients of variation and specificcombining abilities were established for height and basal diameter traits. Significant positive correlations were found between progeny performances of growth traits and genetic distances of parents based on sequence-related amplified polymorphism markers or a combination of all 3 marker systems. This revealed that crosses between genetically distant parents produced progenies with excellent growth performances. The lack of correlations between parental genetic distances and withinfamily coefficients of variation or specific-combining abilities suggested that these characteristics were unpredictable. The results of this study Progeny performance and genetic distances in E. ulmoides represent a potential criterion to predict progeny performances and choose parents in the breeding program.

“…Eucommia ulmoides Oliver (2n = 34), the only species of the genus Eucommia in the family Eucommiaceae, produces trans-polyisoprene, which is distinguished as eucommia rubber (EU-rubber) (Hu, 1979). EU-rubber is obtained from the whole tree except for the xylem, and is a hard rubber with thermoplasticity and properties similar to those of plastic (Nakazawa et al, 2009). In China, Japan, and Russia, E. ulmoides is cultivated for EU-rubber, which is used as an insulator in the manufacture of wire rope, submarine cables, and dental supplies.…”

Section: Introductionmentioning

confidence: 99%

Quantitative trait locus analysis of leaf morphological characters, yield-related traits, and secondary metabolite contents in Eucommia ulmoides

Li¹,

Wei²,

Li³

et al. 2015

ABSTRACT. Eucommia ulmoides is cultivated for the production of eucommia rubber and Chinese herbal drugs. Molecular breeding methods, such as marker-assisted selection (MAS), have the potential to improve the efficiency of E. ulmoides breeding. Quantitative trait locus (QTL) analysis was applied to identify marker-trait associations for E. ulmoides using an F 1 mapping population of 152 individuals derived from a cross between the wild genotype Xiaoye and the cultivar Qinzhong No. 1. A total of 78 QTLs were identified for 12 leaf traits involving morphology, yield, and secondary metabolites. Phenotypic variance explained by individual QTLs ranged from 10.4 to 53.3%. Fifteen QTL clusters, each harboring loci controlling at least two leaf traits, were detected across nine linkage groups. Co-location of these QTLs may be due to pleiotropy or linkage. Three main QTL regions for secondary metabolites were consistently identified each year. QTL information from this study furthers our understanding of the genetic architecture of these economically important traits and of MAS in E. ulmoides breeding.