Genetics of Glomerella. I. Studies on the Behavior of Certain Strains

Lucas, G. B.; Chilton, S. J. P.; Edgerton, C. W.

doi:10.2307/2437611

Cited by 18 publications

(9 citation statements)

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“…Sexual behavior among the Glomerella strains from bean was similar in some ways to a series of descriptions of a G. cingulata population isolated from morning glory, published in the first half of the 20 th century [17]–[28]. These extensive studies resulted in a theory of sexual compatibility in Glomerella known as unbalanced heterothallism, where loss of fertility occurs as a result of frequent mutations in the many required steps for full self-fertility, and compatibility is a result of genetic complementation [27].…”

Section: Discussionsupporting

confidence: 66%

Characterization of Glomerella Strains Recovered from Anthracnose Lesions on Common Bean Plants in Brazil

et al. 2014

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Anthracnose caused by Colletotrichum lindemuthianum is an important disease of common bean, resulting in major economic losses worldwide. Genetic diversity of the C. lindemuthianum population contributes to its ability to adapt rapidly to new sources of host resistance. The origin of this diversity is unknown, but sexual recombination, via the Glomerella teleomorph, is one possibility. This study tested the hypothesis that Glomerella strains that are frequently recovered from bean anthracnose lesions represent the teleomorph of C. lindemuthianum. A large collection of Glomerella isolates could be separated into two groups based on phylogenetic analysis, morphology, and pathogenicity to beans. Both groups were unrelated to C. lindemuthianum. One group clustered with the C. gloeosporioides species complex and produced mild symptoms on bean tissues. The other group, which belonged to a clade that included the cucurbit anthracnose pathogen C. magna, caused no symptoms. Individual ascospores recovered from Glomerella perithecia gave rise to either fertile (perithecial) or infertile (conidial) colonies. Some pairings of perithecial and conidial strains resulted in induced homothallism in the conidial partner, while others led to apparent heterothallic matings. Pairings involving two perithecial, or two conidial, colonies produced neither outcome. Conidia efficiently formed conidial anastomosis tubes (CATs), but ascospores never formed CATs. The Glomerella strains formed appressoria and hyphae on the plant surface, but did not penetrate or form infection structures within the tissues. Their behavior was similar whether the beans were susceptible or resistant to anthracnose. These same Glomerella strains produced thick intracellular hyphae, and eventually acervuli, if host cell death was induced. When Glomerella was co-inoculated with C. lindemuthianum, it readily invaded anthracnose lesions. Thus, the hypothesis was not supported: Glomerella strains from anthracnose lesions do not represent the teleomorphic phase of C. lindemuthianum, and instead appear to be bean epiphytes that opportunistically invade and sporulate in the lesions.

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Section: Discussionsupporting

confidence: 66%

Characterization of Glomerella Strains Recovered from Anthracnose Lesions on Common Bean Plants in Brazil

et al. 2014

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“…For the genus Colletotrichum and its teleomorph Glomerella, the genetic basis of sexual compatibility is uncertain, despite the pioneering experiments of Edgerton, Wheeler and colleagues between 1914 and 1959 that served to elucidate the genetics of sexual development in G. cingulata (e.g. Driver and Wheeler, 1955;Edgerton, 1914;Edgerton et al, 1945;Lucas et al, 1944;Wheeler et al, 1948Wheeler et al, , 1959. What is well known, however, is that the regulation of mating in Colletotrichum is often unpredictable and appears to be rather different from that in other filamentous ascomycetes.…”

Section: Discussionmentioning

confidence: 99%

The evolution of transposon repeat-induced point mutation in the genome of Colletotrichum cereale: Reconciling sex, recombination and homoplasy in an ‘‘asexual” pathogen

Crouch

Glasheen

Giunta

et al. 2008

Fungal Genetics and Biology

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“…Monoascosporic cultures from asci of different perithecia indicated that some perithecia were hybrid (heterozygous), yielding 1:1 ratios for the plus-light and minus-dark phenotypes, and other perithecia were selfs (homozygous), yielding only plus-light or minusdark cultures. LUCAS et al (1944) reported comparable results for wild cultures from five different host-species. STRUBLE and KEITT (1950) reported monogenic inheritance for nicotinic acid deficiency in asci from a number of perithecia in a,ridge between two wild strains.…”

mentioning

confidence: 73%

Relative Heterothallism and Production of Hybrid Perithecia by Auxotrophic Mutants of Glomerella cingulata from Apple

Beraha

Garber

1985

Journal of Phytopathology

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Glomerella cmgulata is a homothallic species but produces a ridge of fertile perithecia at a frontier between certain wild‐type strains on agar. To account for the presence or absence of perithecia earlier workers suggested that alleles at A and B loci control the formation of perithecia at mycelial frontiers in + and – strains. We propose that G. cingulata actually demonstrates “relative heterothallism”. Of 7 induced nutritionally deficient mutants (auxotrophs) in 2 wild‐type strains from apple, only one methionine (met‐1) and one arginine (arg) mutant in only one wild‐type strain gave a heavy ridge of perithecia at their junctures. Neither the met‐l nor arg mutations have been identified as those in the A or B locus. The perithecia were either homozygous (selfs) for met‐1 or arg, or heterozygous (hybrids). Paired met‐1 and arg segregants from hybrid perirhecia as well as diauxotrophic strains from met‐l or arg mutants also gave hybrids of selfs. Specific nutritional deficiencies in certain wild‐type strains which can direct sexuality are not yet known. Genetic studies are now feasible in G. cingulata to define enzymatic factors responsible for pathogenicity.

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Genetics of Glomerella. I. Studies on the Behavior of Certain Strains

Cited by 18 publications

References 0 publications

Characterization of Glomerella Strains Recovered from Anthracnose Lesions on Common Bean Plants in Brazil

Characterization of Glomerella Strains Recovered from Anthracnose Lesions on Common Bean Plants in Brazil

The evolution of transposon repeat-induced point mutation in the genome of Colletotrichum cereale: Reconciling sex, recombination and homoplasy in an ‘‘asexual” pathogen

Relative Heterothallism and Production of Hybrid Perithecia by Auxotrophic Mutants of Glomerella cingulata from Apple

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