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        Detection of favorable alleles for yield and yield components by association mapping in upland cotton

        Chengguang Dong,Juan Wang,Quanjia Chen,Yu Yu,Baocheng Li 한국유전학회 2018 Genes & Genomics Vol.40 No.7

        Association mapping based on linkage disequilibrium provides a promising tool for dissecting the genetic basis underlying complex traits. To reveal the genetic variations of yield and yield components traits in upland cotton, 403 upland cotton accessions were collected and analyzed by 560 genome-wide simple sequence repeats (SSRs). A diverse panel consisting of 403 upland cotton accessions was grown in six different environments, and the yield and yield component traits were measured, and 560 SSR markers covering the whole genome were mapped. Association studies were performed to uncover the genotypic and phenotypic variations using a mixed linear model. Favorable alleles and typical accessions for yield traits were identified. A total of 201 markers were polymorphic, revealing 394 alleles. The average gene diversity and polymorphism information content were 0.556 and 0.483, respectively. Based on a population structure analysis, 403 accessions were divided into two subgroups. A mixed linear model analysis of the association mapping detected 43 marker loci according to the best linear unbiased prediction and in at least three of the six environments(− lgP > 1.30, P < 0.05). Among the 43 associated markers, five were associated with more than two traits simultaneously and nine were coincident with those identified previously. Based on phenotypic effects, favorable alleles and typical accessions that contained the elite allele loci related to yield traits were identified and are widely used in practical breeding. This study detected favorable quantitative trait loci’s alleles and typical accessions for yield traits, these are excellent genetic resources for future high-yield breeding by marker-assisted selection in upland cotton in China.

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        Bioassay-guided isolation and identification of anti-platelet-active compounds from the root of Ashitaba (Angelica keiskei Koidz.).

        Son, Dong Ju,Park, Ye Oak,Yu, Chengguang,Lee, Sung Eun,Park, Young Hyun Taylor & Francis Health Sciences 2014 NATURAL PRODUCT RESEARCH Vol.28 No.24

        <P>Platelet aggregation is fundamental to a wide range of physiological and pathological processes, including the induction of thrombosis and arteriosclerosis. Anti-platelet activity of a crude methanol extract and solvent fractions of Ashitaba roots (Angelica keiskei Koidz.) was evaluated using a turbidimetric method using washed rabbit platelets. We identified the anti-platelet activities of two chalcones, 4-hydroxyderricin and xanthoangelol, isolated from the ethyl acetate-soluble fraction of Ashitaba roots by using a bioassay-guided isolation method. 4-Hydroxyderricin and xanthoangelol effectively inhibited platelet aggregation induced by collagen (IC50 of 41.9 and 35.9?μM, respectively), platelet-activating factor (IC50 of 46.1 and 42.3?μM, respectively) and phorbol 12-myristate 13-acetate (IC50 of 16.5 and 45.9?μM, respectively). These compounds did not inhibit thrombin-induced platelet aggregation (IC50 of>80?μM). The results suggest that the chalcones 4-hydroxyderricin and xanthoangelol may be potent anti-thrombotic components of A. keiskei Koidz.</P>

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