Evidence for mating between islates of Colletotrichum gloeosporioides with different host specificities

Cisar, C. R.; Spiegel, Frederick W.; TeBeest, D. O.; Trout, Christina V.

doi:10.1007/bf00351486

Cited by 34 publications

(27 citation statements)

References 21 publications

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“…Previous host specificity studies involved inter-and intraspecific hybridizations of fungal pathogens (15,36). However, despite the potential importance of ecological factors driving genetic divergence, they are poorly understood in fungi (18,22,32,33), and most of the existing data have been obtained from highly artificial experiments (18).…”

Section: Discussionmentioning

confidence: 99%

Ecological Genetic Divergence of the Fungal PathogenDidymella rabieion Sympatric Wild and DomesticatedCicerspp. (Chickpea)

Frenkel

Peever

Chilvers

et al. 2010

Appl Environ Microbiol

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For millennia, chickpea (Cicer arietinum) has been grown in the Levant sympatrically with wild Cicer species. Chickpea is traditionally spring-sown, while its wild relatives germinate in the autumn and develop in the winter. It has been hypothesized that the human-directed shift of domesticated chickpea to summer production was an attempt to escape the devastating Ascochyta disease caused by Didymella rabiei. We estimated genetic divergence between D. rabiei isolates sampled from wild Cicer judaicum and domesticated C. arietinum and the potential role of temperature adaptation in this divergence. Neutral genetic markers showed strong differentiation between pathogen samples from the two hosts. Isolates from domesticated chickpea demonstrated increased adaptation to higher temperatures when grown in vitro compared with isolates from the wild host. The distribution of temperature responses among progeny from crosses of isolates from C. judaicum with isolates from C. arietinum was continuous, suggesting polygenic control of this trait. In vivo inoculations of host plants indicated that pathogenic fitness of the native isolates was higher than that of their hybrid progeny. The results indicate that there is a potential for adaptation to higher temperatures; however, the chances for formation of hybrids which are capable of parasitizing both hosts over a broad temperature range are low. We hypothesize that this pathogenic fitness cost is due to breakdown of coadapted gene complexes controlling pathogenic fitness on each host and may be responsible for maintenance of genetic differentiation between the pathogen demes.

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Section: Discussionmentioning

confidence: 99%

Ecological Genetic Divergence of the Fungal PathogenDidymella rabieion Sympatric Wild and DomesticatedCicerspp. (Chickpea)

Frenkel

Peever

Chilvers

et al. 2010

Appl Environ Microbiol

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“…However, Cisar et al (1994) demonstrated that, under laboratory conditions, apparently genetically diverse isolates of C. gloeosporioides from different hosts may be sexually compatible. Thus, even though Colletotrichum is a cosmopolitan genus with an extensive host range, our understanding of the potential for sexual reproduction and gene flow in populations lags significantly behind that of many other ascomycetes.…”

Section: Colletotrichum Speciesmentioning

confidence: 96%

Population Structure of Ascomycetes and Deuteromycetes

Correll¹,

Gordon²

1999

Structure and Dynamics of Fungal Populations

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“…Furthermore, a heterothallic isolate from pecan, able to infect apple, was found to mate with isolates of C. gloeosporioides f. sp. aeschynomene, a mycoherbicide of northern jointvetch weed (Cisar et al, 1994).…”

Section: -235 March/april 2010mentioning

confidence: 99%

Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment

López¹,

Lucas

2010

Sci. agric. (Piracicaba, Braz.)

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The cashew (Anacardium occidentale L.) crop is an important source of income for the population of the Brazilian Northeast, and anthracnose disease caused by Colletotrichum gloeosporioides leads to significant production loss. However, there is little information on either the host resistance or the variation in the aggressiveness of the pathogen under controlled environment. The reaction of commercial (CCP-06, CCP-09, CCP-76 and CCP-1001) and one non-commercial (CAP-14) dwarf cashew clones was assessed against 36 isolates of this fungus controlled environmental conditions. All the isolates, including those from hosts other than cashew, were able to cause lesions on leaves and stems of most clones, albeit to different degrees. Clone CCP-06 was the most susceptible, while clone CCP-1001 showed a level of resistance to a number of the isolates, including isolate 905, while isolates 910 and 912 were aggressive to all clones. Injury increased the susceptibility of the clones to all isolates, indicating that resistance also might be associated with structural barriers that hinder penetration. Ripened cashew apples (8-week-old), of commercial clones were susceptible to isolates 905 and 910. Immature pseudo-fruits (2-week-old), with exception of clone CCP-76 which was susceptible to both isolates showed resistance against these isolates, suggesting the presence of structural and chemical barriers. Developed nuts (8-week-old), however, were more resistant than immature nuts (2-weekold) to both isolates, probably due to their thicker exocarp cuticle and reduced number of stomatal pores. Key words: Anacardium occidentale, anthracnose, resistance, aggressiveness Reação de clones de cajueiro-anão a isolados de Colletotrichum gloeosporioides em ambiente controladoRESUMO: A cultura de caju (Anacardium occidentale L.) é uma fonte de renda importante para a população do Nordeste brasileiro, sendo a antracnose causada por Colletotrichum gloeosporioides a doença que mais conduz a perdas de sua produção. Entretanto, há pouca informação para a resistência desse hospedeiro ou para a variação na agressividade do patógeno em ambiente controlado. A reação de clones comerciais (CCP-06, CCP-09, CCP-76 e CCP-1001) e um não comercial (CAP-14) de cajueiros anão-precoce, contra 36 isolados desse fungo, foi avaliada sob condições controladas. Todos os isolados, incluindo os provenientes de diferentes hospedeiros, foram capazes de causar lesões sobre folhas e hastes da maioria dos clones, ainda que em graus diferenciados. O clone CCP-06 foi o mais suscetível, enquanto o clone CCP-1001 foi resistente a mais isolados, incluindo o 905, enquanto os isolados 910 e 912 foram agressivos a todos os clones testados. A injúria mecânica das folhas aumentou a suscetibilidade dos clones a todos os isolados, indicando que a resistência pode também estar associada a barreiras estruturais que impedem a penetração. Os pseudofrutos amadurecidos (8 semanas) dos clones comerciais avaliados, foram suscetíveis a ambos os isolados testados (905 e 910), mas...

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Evidence for mating between islates of Colletotrichum gloeosporioides with different host specificities

Cited by 34 publications

References 21 publications

Ecological Genetic Divergence of the Fungal PathogenDidymella rabieion Sympatric Wild and DomesticatedCicerspp. (Chickpea)

Ecological Genetic Divergence of the Fungal PathogenDidymella rabieion Sympatric Wild and DomesticatedCicerspp. (Chickpea)

Population Structure of Ascomycetes and Deuteromycetes

Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment

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