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      Establishing an Efficient Way to Utilize the Drought Resistance Germplasm Population in Wheat

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          Drought resistance breeding provides a hopeful way to improve yield and quality of wheat in arid and semiarid regions. Constructing core collection is an efficient way to evaluate and utilize drought-resistant germplasm resources in wheat. In the present research, 1,683 wheat varieties were divided into five germplasm groups (high resistant, HR; resistant, R; moderate resistant, MR; susceptible, S; and high susceptible, HS). The least distance stepwise sampling (LDSS) method was adopted to select core accessions. Six commonly used genetic distances (Euclidean distance, Euclid; Standardized Euclidean distance, Seuclid; Mahalanobis distance, Mahal; Manhattan distance, Manhat; Cosine distance, Cosine; and Correlation distance, Correlation) were used to assess genetic distances among accessions. Unweighted pair-group average (UPGMA) method was used to perform hierarchical cluster analysis. Coincidence rate of range (CR) and variable rate of coefficient of variation (VR) were adopted to evaluate the representativeness of the core collection. A method for selecting the ideal constructing strategy was suggested in the present research. A wheat core collection for the drought resistance breeding programs was constructed by the strategy selected in the present research. The principal component analysis showed that the genetic diversity was well preserved in that core collection.

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          Most cited references 32

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

           J Hu,  J. Zhu,  H. Xu (2000)
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            Phenotyping transgenic wheat for drought resistance.

            Realistic experimental protocols to screen for drought adaptation in controlled conditions are crucial if high throughput phenotyping is to be used for the identification of high performance lines, and is especially important in the evaluation of transgenes where stringent biosecurity measures restrict the frequency of open field trials. Transgenic DREB1A-wheat events were selected under greenhouse conditions by evaluating survival and recovery under severe drought (SURV) as well as for water use efficiency (WUE). Greenhouse experiments confirmed the advantages of transgenic events in recovery after severe water stress. Under field conditions, the group of transgenic lines did not generally outperform the controls in terms of grain yield under water deficit. However, the events selected for WUE were identified as lines that combine an acceptable yield-even higher yield (WUE-11) under well irrigated conditions-and stable performance across the different environments generated by the experimental treatments.
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              Proteins linked to drought tolerance revealed by DIGE analysis of drought resistant and susceptible barley varieties.

              Drought is a major threat to world agriculture. In order to identify proteins associated with plant drought tolerance, barley varieties bred in the UK (Golden Promise) and Iraq (Basrah) were compared. The variety Basrah showed physiological adaptations to drought when compared to Golden Promise, for example relative water content of roots and shoots after 1 week of drought was much higher for Basrah than for Golden Promise. DIGE analysis was carried out on proteins from roots and leaves under control and drought conditions. Twenty-four leaf and 45 root proteins were identified by MALDI-TOF MS. The relative expression patterns of the identified proteins fell into a number of distinct classes. The variety Basrah is characterised by constitutive expression or higher drought-induced expression levels of proteins regulating ROS production and protein folding. Photosynthetic enzymes, by contrast, were downregulated in Basrah. Enzyme assays showed a good correlation between DIGE-derived protein abundance estimates and enzyme activity in extracts. Overall, this study shows that the enhanced drought tolerance of variety Basrah is driven by an enhanced regulation of ROS under drought. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

                Author and article information

                The Scientific World Journal
                Hindawi Publishing Corporation
                7 May 2013
                : 2013
                1Seed Science Center, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
                2Shandong Crop Germplasm Center, Shandong Academy of Agricultural Sciences, Jinan 250100, China
                Author notes

                Academic Editors: J. Huang and Z. Wang

                Copyright © 2013 Jiancheng Wang et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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