Two Genetically Distinct Populations of <i>Colletotrichum gloeosporioides</i> Penz. Causing Anthracnose Disease of Yam (<i>Dioscorea</i> spp.)

Abang, Mathew M.; Fagbola, O.; Smalla, Kornelia; Winter, Stephan

doi:10.1111/j.1439-0434.2005.00942.x

Cited by 34 publications

(60 citation statements)

References 33 publications

(51 reference statements)

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“…Information on pathogen diversity and the geographic distribution of the pathogen population is therefore a prerequisite for accurate assessment of durable resistant germplasm in breeding programs (Abang, 2003). suggested that knowledge of pathotype diversity is important when choosing the appropriate isolates to screen for resistance in plant breeding programs.…”

Section: Pathogenic Variability Of Colleto-trichum Speciesmentioning

confidence: 99%

“…Abang (2003) stated that genetic population structure refers to the amount and distribution of genetic variation within and between populations. For example, how rapidly a pathogen can evolve could be indicated by the amount of genetic variation maintained within a population and then which may eventually be used to predict how long a control measure is probable to be effective (McDonald and Linde, 2002).…”

Section: Population Structure and Molecular Marker Techniquesmentioning

confidence: 99%

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Chilli anthracnose disease caused by Colletotrichum species

Than

Prihastuti

Phoulivong

et al. 2008

J. Zhejiang Univ. Sci. B

191

121

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Anthracnose disease is one of the major economic constraints to chilli production worldwide, especially in tropical and subtropical regions. Accurate taxonomic information is necessary for effective disease control management. In the Colletotrichum patho-system, different Colletotrichum species can be associated with anthracnose of the same host. Little information is known concerning the interactions of the species associated with the chilli anthracnose although several Colletotrichum species have been reported as causal agents of chilli anthracnose disease worldwide. The ambiguous taxonomic status of Colletotrichum species has resulted in inaccurate identification which may cause practical problems in plant breeding and disease management. Although the management and control of anthracnose disease are still being extensively researched, commercial cultivars of Capsicum annuum that are resistant to the pathogens that cause chilli anthracnose have not yet been developed. This paper reviews the causal agents of chilli anthracnose, the disease cycle, conventional methods in identification of the pathogen and molecular approaches that have been used for the identification of Colletotrichum species. Pathogenetic variation and population structure of the causal agents of chilli anthracnose along with the current taxonomic status of Colletotrichum species are discussed. Future developments leading to the disease management strategies are suggested.

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Section: Pathogenic Variability Of Colleto-trichum Speciesmentioning

confidence: 99%

Section: Population Structure and Molecular Marker Techniquesmentioning

confidence: 99%

Chilli anthracnose disease caused by Colletotrichum species

Than

Prihastuti

Phoulivong

et al. 2008

J. Zhejiang Univ. Sci. B

191

121

View full text Add to dashboard Cite

show abstract

“…Yield losses of up to 90% have been reported under conditions favourable for disease development, while the disease is believed to be responsible for the disappearance of some popular cultivars of D. alata in the Caribbean (Winch et al 1984;McDonald et al 1998). Recent studies on C. gloeosporioides isolates associated with yam in the French West Indies (Frézal et al 2003;Frézal 2005) and in Nigeria (Abang et al 2004(Abang et al , 2005 revealed high genetic and pathogenic variations in between-field and withinfield isolates. Breeding for improved anthracnose resistance in farmers' preferred yam cultivars is the most reliable approach to disease management.…”

Section: Introductionmentioning

confidence: 97%

An intraspecific genetic map of water yam (Dioscorea alata L.) based on AFLP markers and QTL analysis for anthracnose resistance

et al. 2011

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Water yam (Dioscorea alata L.) is the most widely cultivated food yams. Despite its importance, its production is limited by anthracnose disease caused by Colletotrichum gloeosporioides (Penz.). The use of resistant yam varieties is the most reliable approach of management of this disease. The speed and precision of breeding can be improved by the development of genetic linkage maps which would provide the basis for locating and hence manipulating quantitative traits such as anthracnose resistance in breeding programmes. An F1 diploid population was developed by crossing 'Boutou' a female clone (with field resistance to anthracnose) with 'Pyramide' (susceptible). A linkage map was generated with 523 polymorphic markers from 26 AFLP primer combinations. The resulting map covered a total length of 1538 cM and included 20 linkage groups. It is the most saturated of all genetic linkage maps of yam to date. QTL analysis of anthracnose resistance was performed based on response to two isolates of C. gloeosporioides. Resistance to anthracnose appeared to be inherited quantitatively. Using a LOD significance threshold of 2.6 we identified a total of nine QTLs for anthracnose resistance. The phenotypic variance explained by each QTL ranged from 7.0 to 32.9% whereas the total amount of phenotypic variation for anthracnose resistance explained by all significant QTLs varied from 26.4 to 73.7% depending on the isolate and the variable considered. These QTLs displayed isolatespecific resistance as well as broad spectrum resistance. The availability of molecular markers linked to the QTLs of anthracnose resistance will facilitate marker-assisted selection in breeding programmes.

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“…A combination of molecular diagnostic techniques and conventional morphological characterization is a suitable and reliable approach for studying Colletotrichum species/isolates complexes [80,81]. But it is very much difficult to diagnose the dormant infections of the C. falcatum fungus in seed canes under field conditions as red colour develops on stem and leaves at a later stage [82].…”

Section: Diagnostic Measuresmentioning

confidence: 99%