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Dive into the research topics where Haipeng Xu is active.

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Featured researches published by Haipeng Xu.


Theoretical and Applied Genetics | 2000

Methods of constructing core collections by stepwise clustering with three sampling strategies based on the genotypic values of crops.

Jian Hu; Jun Zhu; Haipeng Xu

Abstract A genetic model with genotype×environment (GE) interactions for controlling systematical errors in the field can be used for predicting genotypic values by an adjusted unbiased prediction (AUP) method. Mahalanobis distance, calculated based on the genotypic values, is then applied to measure the genetic distance among accessions. The unweighted pair-group average, Ward’s and the complete linkage methods of hierarchical clustering combined with three sampling strategies are proposed to construct core collections in a procedure of stepwise clustering. A homogeneous test and t-tests are suggested for use in testing variances and means, respectively. The coincidence rate (CR%) for range and the variable rate (VR%) for the coefficient of variation are designed to evaluate the property of core collections. A worked example of constructing core collections in cotton with 21 traits was conducted. Random sampling can represent the genetic diversity structure of the initial collection. Preferred sampling can keep the accessions with special or valuable characteristics in the initial collection. Deviation sampling can retain the larger genetic variability of the initial collection. For better representation of the core collection, cluster methods should be combined with different sampling strategies. The core collections based on genotypic values retained larger genetic variability and had superior representatives than those based on phenotypic values.


Theoretical and Applied Genetics | 2007

A strategy on constructing core collections by least distance stepwise sampling

Jin-lei Wang; Jin Hu; Haipeng Xu; Suzhan Zhang

A strategy was proposed for constructing core collections by least distance stepwise sampling (LDSS) based on genotypic values. In each procedure of cluster, the sampling is performed in the subgroup with the least distance in the dendrogram during constructing a core collection. Mean difference percentage (MD), variance difference percentage (VD), coincidence rate of range (CR) and variable rate of coefficient of variation (VR) were used to evaluate the representativeness of core collections constructed by this strategy. A cotton germplasm collection of 1,547 accessions with 18 quantitative traits was used to construct core collections. Genotypic values of all quantitative traits of the cotton collection were unbiasedly predicted based on mixed linear model approach. By three sampling percentages (10, 20 and 30%), four genetic distances (city block distance, Euclidean distance, standardized Euclidean distance and Mahalanobis distance) combining four hierarchical cluster methods (nearest distance method, furthest distance method, unweighted pair-group average method and Ward’s method) were adopted to evaluate the property of this strategy. Simulations were conducted in order to draw consistent, stable and reproducible results. The principal components analysis was performed to validate this strategy. The results showed that core collections constructed by LDSS strategy had a good representativeness of the initial collection. As compared to the control strategy (stepwise clusters with random sampling strategy), LDSS strategy could construct more representative core collections. For LDSS strategy, cluster methods did not need to be considered because all hierarchical cluster methods could give same results completely. The results also suggested that standardized Euclidean distance was an appropriate genetic distance for constructing core collections in this strategy.


Crop & Pasture Science | 2009

Identification of endosperm and maternal plant QTLs for protein and lysine contents of rice across different environments

C. H. Shi; Y. Shi; Xiang-Yang Lou; Haipeng Xu; Xiaoxiang Zheng; J. G. Wu

Using a newly developed mapping model with endosperm and maternal main effects and QTL × environment interaction effects on quantitative quality traits of seed in cereal crops, the investigation of quantitative trait loci (QTLs) located on triploid endosperm and diploid maternal plant genomes for protein content and lysine content of rice grain under different environments was carried out with two backcross (BC1F1 and BC2F1) populations from a set of 241 recombinant inbred lines derived from an elite hybrid cross of Shanyou 63. The results showed a total of 18 QTLs to be associated with these two quality traits of rice, which were subsequently mapped on chromosomes 2, 3, 5, 6, 7, 10, 11 and 12. Three of these QTLs were also found having QTL × environment interaction effects. Therefore, the genetic main effects from QTLs located on chromosomes in endosperm and maternal plant genomes and their QTL × environment interaction effects in different environments were all important for protein and lysine contents in rice. The influence of environmental factors on the expression of some QTLs located in different genetic systems could not be ignored for both nutrient quality traits.


Macromolecules | 2008

Hybrids of Triphenylamine-Functionalized Polyacetylenes and Multiwalled Carbon Nanotubes: High Solubility, Strong Donor−Acceptor Interaction, and Excellent Photoconductivity

Hui Zhao; Wang Zhang Yuan; Li Tang; Jing Zhi Sun; Haipeng Xu; Anjun Qin; Yu Mao; Jia Ke Jin; Ben Zhong Tang


Theoretical and Applied Genetics | 2008

The QTL analysis on maternal and endosperm genome and their environmental interactions for characters of cooking quality in rice (Oryza sativa L.).

Xiaoxiang Zheng; J. G. Wu; Xiang-Yang Lou; Haipeng Xu; C. H. Shi


Macromolecules | 2005

Induced Chain Alignment, Efficient Energy Transfer, and Enhanced Light Emission in Functional Polyacetylene−Perovskite Hybrids

Jianli Hua; Zhen Li; Jacky Wing Yip Lam; Haipeng Xu; Jing Zhi Sun; Yuping Dong; Yongqiang Dong; Anjun Qin; Wang Zhang Yuan; Hongzheng Chen; and Mang Wang; Ben Zhong Tang


Journal of Physical Chemistry B | 2006

Functional perovskite hybrid of polyacetylene ammonium and lead bromide: Synthesis, light emission, and fluorescence imagining.

Haipeng Xu; Jing Zhi Sun; Anjun Qin; Jianli Hua; Zhen Li; Yongqiang Dong; Hai Xu; Wang Zhang Yuan; Yuguang Ma; Mang Wang; Ben Zhong Tang


Science China-chemistry | 2009

Detection of the critical micelle concentration of cationic and anionic surfactants based on aggregation-induced emission property of hexaphenylsilole derivatives

Li Tang; Jiake Jin; Shuang Zhang; Yu Mao; Jing Zhi Sun; Wang Zhang Yuan; Hui Zhao; Haipeng Xu; Anjun Qin; Ben Zhong Tang


Journal of Luminescence | 2009

Aggregation-induced emission of an aminated silole : A fluorescence probe for monitoring layer-by-layer self-assembling processes of polyelectrolytes

Jiake Jin; Jing Zhi Sun; Yongqiang Dong; Haipeng Xu; Wang Zhang Yuan; Ben Zhong Tang


Macromolecules | 2008

Synthesis of sulfur-containing polyacetylenes and fabrication of their hybrids with ZnO nanoparticles

Haipeng Xu; Jia Ke Jin; Yu Mao; Jing Zhi Sun; Feng Yang; Wang Zhang Yuan; Yongqiang Dong; Mang Wang; Ben Zhong Tang

Collaboration


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Ben Zhong Tang

Hong Kong University of Science and Technology

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Wang Zhang Yuan

Shanghai Jiao Tong University

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Yu Mao

Zhejiang University

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Anjun Qin

South China University of Technology

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Yongqiang Dong

Hong Kong University of Science and Technology

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Jacky Wing Yip Lam

Hong Kong University of Science and Technology

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Jianli Hua

East China University of Science and Technology

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