Breeding Cotton for Tolerance to Verticillium Wilt PDF Download

Author: John R. Cotton
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 18

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Author: Michael Edward Devey
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 240

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Author: Gasper Martinez
Publisher:
ISBN:
Category :
Languages : en
Pages : 198

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Book Description
Upland cotton (Gossypium hirsutum L.) is the most important fiber crop, and the US is the third largest cotton producer after India and China and the largest cotton exporter in the world. Verticillium wilt (VW, caused by Verticillium dahliae Kleb.) is a destructive fungal soil-borne disease in Upland cotton production. High levels of VW resistance exist in Pima cotton (G. barbadense L.) and can be transferred into Upland cotton through interspecific introgression breeding. In a greenhouse study, VW resistance was evaluated in a multi-parent advanced generation inter-cross (MAGIC) introgressed line (IL) population of 712 lines, generated from a Random mated Barbadense Upland Population (RMBUP-C4) derived from five cycles of random mating of crosses between three Upland cotton cultivars and 18 chromosome substitution lines (CSLs) each carrying a pair of Pima cotton chromosome or arm. The objectives of this study were to evaluate VW resistance of the MAGIC IL population in the greenhouse to identify ILs with VW resistance based on a total of four replicated greenhouse tests. In 2016-2017, a total of 712 MAGIC ILs derived from RMBUP-C4 were evaluated for VW resistance in two replicated tests (Test 1 and 2) each with two replications, followed by two additional replicated tests (Test 3 and 4) for 200 selected ILs from the entire MAGIC population based on the VW resistant performance in the greenhouse. Approximately 10 plants for each line in each replication were grown and screened for VW resistance using a double or triple root inoculation method based on three parameters, i.e., the disease severity rating, percentage of defoliated leaves and percentage of infected plants, with a total of 40,000 plants evaluated. Based on a correlation analysis indicating that the three traits were significantly and positively correlated with one another in each test, the disease severity rating was the best parameter to assess VW resistance due to its relatively low coefficient of variation and its difference in magnitude to differentiate resistant genotypes from susceptible ones. Of the 712 genotypes, 11 showed higher levels of resistance to VW with lower mean disease severity ratings (0.96- 1.33), percent defoliated leaves (7.97-36.31) and percent infected plants (25-100%) across the four tests and these lines are NMIL348, NMIL518, NMIL405, NMIL290, NMIL164, NMIL307, NMIL375, NMIL477, NMIL389, NMIL390, NMIL425, NMIL206, NMIL291, and NMIL398. These VW resistant ILs can be used as parental lines to improve VW resistance in cotton breeding programs.

Author: G. F. Pegg
Publisher: CABI
ISBN: 9781845933227
Category : Science
Languages : en
Pages : 564

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The genus Verticillium Nees represents one of the world's major fungal pathogens, affecting crop plants mostly in the cool and warm temperate regions, it also occurs in sub-tropical and tropical areas. There are some six species which cause severe wilting in trees, herbaceous plants and plantation crops. Other species are responsible for non-wilt diseases of banana and mushroom, another species infects insects.The monograph provides a comprehensive reference source on Verticillium, enabling research workers to see what has already been achieved and to identify the many new areas of research in which original contributions could be made to further the understanding and control of this important pathogen and the disease it causes.

Author: Harry Rascoe Fulton
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 24

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Author: A. Ciancio
Publisher: Springer Science & Business Media
ISBN: 1402060637
Category : Technology & Engineering
Languages : en
Pages : 364

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The second volume of the IMPD series describes aspects related to the most important phytoparasitic nematodes, considering the integration of biological control methods with other management practices and technologies, including the use of predatory nematodes and microbial rhizosphere antagonists. A focus is given on regional issues. A review on nematode management in cotton is integrated by a chapter on management of nematodes on wheat. New technologies are also revised.

Author: Asena Akköse
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 106

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Cotton with its valuable natural fiber is an economically important field plant. Resistance against stress conditions and diseases are desired traits in cotton production. Verticillium wilt is one of the major factors resulting in huge cotton yield losses. Control of Verticillium disease has not been successful because of low genetic diversity and a complex disease mechanism. Moreover resistance against Verticillium wilt is a quantitative trait that is regulated by more than one gene and under environmental effects. Due to this complex inheritance, conventional breeding methods have not resulted in efficient resistance. Therefore, it is necessary to develop cotton lines resistant to Verticillium wilt using molecular breeding techniques. In this study we aimed to identify the quantitative trait loci which are responsible for Verticillium wilt resistance. For this purpose, we carried out a Verticillium wilt disease test in a natural population composed of 118 individuals. We inoculated the population with Verticillium dahliae in five replicates. After one month, the symptoms were examined and phenotypic variation was detected and scored. We then used 100 SSR markers for genotyping of the population. Population structure was determined with STRUCTURE 2.2.3. According to results, we determined two clusters. There were 44 and 34 individuals in the first and second clusters, respectively. A total of 40 individuals remained intermixed. Association analysis between phenotypic and allelic data was carried out with TASSEL 2.1. In this way we identified 30 SSR markers associated with Verticillium wilt resistance at a significance level of p

Author: Allen Scott Adair
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 124

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Author: University of Arizona. Agricultural Experiment Station
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 56

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Author: Terry Micheal Turner
Publisher:
ISBN:
Category : Cotton
Languages : en
Pages : 50

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