Interspecific hybridisation between Pseudocercosporella herpotrichoides and P. anguioides achieved through protoplast fusion

Hocart, Mark J.; McNaughton, Janice E.

doi:10.1016/s0953-7562(09)80336-5

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…The diploid state of the parasexual cycle would be almost transient; parameiosis [18] would occur spontaneously resulting in either recombinants or heterozygous diploid intermediates. Appearance of novel isozyme banding patterns in interspecific progeny following protoplast fusion has also been seen in the genera Aspergillus [7] and Pseudocercosporella [5].…”

Section: Discussionmentioning

confidence: 96%

Genetic nature, stability, and improved virulence of hybrids from protoplast fusion in Beauveria

1996

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Genetic improvement of two different strains of the entomopathogenic fungus Beauveria bassiana for more effective control of Ostrinia nubilalis and Leptinotarsa decemlineata was obtained by crosses with the insecticidal toxin-producing strain Beauveria sulfurescens. Protoplast fusion between diauxotrophic mutants resulted in the recovery of some stable prototrophic fusion products. The low levels of virulence of the wild type strain B. bassiana 28 isolated originally from L. decemlineata were enhanced both on L. decemlineata and O. nubilalis for one of the hybrids obtained (FP 8) from the cross B. bassiana 28 X B. sulfurescens 2. Fusion product 25 obtained from the cross between B. sulfurescens and the highly pathogenic strain B. bassiana 147 showed a three-day reduction in the LTs0 towards O. nubilalis. Southern blot hybridization with nine probe-enzyme combinations were conducted on genomic DNAs from the original wild strains, parental mutant strains, and fusion products. Additive banding patterns or unique banding pattern of either parental strain was observed in five hybrids, indicating their status as recombinant and/ or partially diploYd. Combination of RFLP markers indicative of both parental genomes was never observed with fusion product FP 25. The stability of the virulence following passage through insect-host and stability of molecular structure for the fusion products FP 8 and FP 25 suggest that asexual genetic recombination by protoplast fusion may provide an attractive method for the genetic improvement of biocontrol efficiency in entomopathogenic fungi.

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Section: Discussionmentioning

confidence: 96%