Breeding for resistance to Fusarium head blight of wheat in the mid- to lower Yangtze River Valley of China PDF Download

Author: Yang Zhuping
Publisher: CIMMYT
ISBN: 9789686923223
Category :
Languages : en
Pages : 24

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Author: Z. H. He
Publisher: CIMMYT
ISBN: 970648079X
Category : Wheat
Languages : en
Pages : 99

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Book Description
Wheat and wheat breeding in China: an overview; The north China winter wheat zone; The huang huai facultative wheat zone; The middle and lower yangtze valley autumn-sown spring wheat zone; The southwestern autumn-sown spring wheat zone; The south China autumn-sown spring wheat zone; The northeastern spring-sown spring wheat zone; The northern spring-sown spring wheat zone; The northwestern spring wheat zone; The Qinghai-Tibet spring and winter wheat zone; The xinjiang winter and spring wheat zone.

Author: Peter Bulli
Publisher: Frontiers Media SA
ISBN: 283250373X
Category : Science
Languages : en
Pages : 259

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Author: Virginia Laura Verges
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
Publisher: CIMMYT
ISBN:
Category :
Languages : en
Pages : 59

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Book Description

Author: He Zhonghu
Publisher: CIMMYT
ISBN: 9789686923957
Category :
Languages : en
Pages : 96

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Author:
Publisher: CIMMYT
ISBN: 9706480692
Category : Wheat
Languages : en
Pages : 88

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Book Description

Author: Yaoguang Li
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Wheat Fusarium head blight (FHB) is a devastating disease of wheat worldwide, which can significantly reduce grain yield and quality. Although the application of fungicides can reduce FHB damage, growing FHB resistant wheat is the most effective and eco-friendly approach to reduce the losses. To develop locally adapted FHB-resistant hard winter wheat germplasm, we transferred three major QTLs: Fhb1, Qfhs.ifa-5A, and Qfhb.rwg-5A.2 into two hard winter wheat cultivars, 'Everest' and 'Overland', using marker-assisted backcrossing and multiplex restriction amplicon sequencing (MRASeq). Ten 'Overland' background lines and nine 'Everest' background lines with better FHB resistance, recurrent parent similar agronomic traits were selected. They can be used as FHB resistant bridge parents for hard winter wheat breeding. To identify native FHB resistant sources, a population of 201 U.S. breeding lines and cultivars were genotyped using 90K wheat SNP arrays and phenotyped for the percentage of symptomatic spikelets (PSS), Fusarium damaged kernels (FDK) and deoxynivalenol (DON), a toxin produced by the pathogen. Genome-wide association studies (GWAS) identified significant trait associations with single nucleotide polymorphisms (SNPs) on chromosomes 1A, 1D, 2B, 3A, 3B, 4A, 5B and 5D. These marker-trait associations (MTAs) were significant for at least two of the three traits or a single trait in at least two experiments. To accelerate the evaluation of the FDK, we developed an algorithm that can separate FDK from healthy kernels with an accuracy of 90% based on color differences using image processing and unsupervised machine learning methods. Discovery and creation of the new FHB resistant germplasms and development of the fast FDK phenotyping algorithm will accelerate the improvement of U.S. hard winter wheat cultivars for FHB resistance.

Author: Harvey Jesse Dubin
Publisher: CIMMYT
ISBN: 9789686923940
Category : Fusarium head scab
Languages : en
Pages : 140

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Author: Jin Cai
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Fusarium head blight (FHB) is one of the most devastative diseases in wheat. Growing resistant cultivars is one of the most effective strategies to minimize the disease damage. Huangcandou (HCD) is a Chinese wheat landrace showing a high level of resistance to FHB spread within a spike (type II). To identify quantitative traits loci (QTL) for resistance in HCD, a population of 190 recombinant inbred lines (RILs) were developed from a cross between HCD and Jagger, a susceptible hard winter wheat (HWW) released in Kansas. The population was evaluated for type II resistance at the greenhouses of Kansas State University. After initial marker screening, 261 polymorphic simple-sequence repeats (SSR) between parents were used for analysis of the RIL population. Among three QTL identified, two from HCD were mapped on the short arms of chromosomes 3B (3BS) and 3A (3AS). The QTL on the distal end of 3BS showed a major effect on type II resistance in all three experiments. This QTL coincides with a previously reported Fhb1, and explained 28.3% of phenotypic variation. The QTL on 3AS explained 9.7% of phenotypic variation for mean PSS over three experiments. The third QTL from chromosome 2D of Jagger explained 6.5% of phenotypic variation. Allelic substitution using the closest marker to each QTL revealed that substitution of Jagger alleles of two QTL on 3AS and 3BS with those from HCD significantly reduced the PSS. HCD containing both QTL on 3AS and 3BS with a large effect on type II resistance can be an alternative source of FHB resistance for improving FHB type II resistance in wheat. Besides, meta-analyses were used to estimate 95% confidence intervals (CIs) of 24 mapped QTL in five previously mapped populations derived from Chinese landraces: Wangshuibai (WSB), Haiyanzhong (HYZ), Huangfangzhu (HFZ), Baishanyuehuang (BSYH) and Huangcandou (HCD). Nineteen QTL for FHB type II resistance were projected to 10 QTL clusters. Five QTL on chromosomes 1A, 5A, 7A, and 3BS (2) were identified as confirmed QTL that have stable and consistent effects on FHB resistance and markers in these meta-QTL regions should be useful for marker-assisted breeding.