Genetic Recombination in Colletotrichum sublineolum |
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Authors: | E A Souza-Paccola L C L Fávaro C R Casela L D Paccola-Meirelles |
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Institution: | Authors' addresses: Departamento de Agronomia (CCA/UEL),;Departamento de Biologia (CCB/UEL),;EMBRAPA Milho e Sorgo (CNPMS) CCB/BIO, Caixa Postal 6001, CEP 860051-990 Londrina/PR, Brazil (correspondence to L. D. Paccola-Meirelles. E-mail: ) |
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Abstract: | Genetic recombination without typical parasexuality (parameiosis) was shown in the fungus Colletotrichum sublineolum, causal agent of anthracnose on sorghum. The cross among auxotrophic mutants and mutants resistant to benomyl and cycloheximide confirmed the occurrence of heterokaryosis in this species. Aneuploid and haploid recombinants were obtained from heterokaryons. Some segregants released sectors continually after several replication cycles, and were considered aneuploids in the process of haploidization. Heterokaryons derived from crosses among mutants that presented low pathogenicity produced more virulent recombinants. Parasexuality with parameiosis may represent a natural mechanism for genetic variability amplification explaining the rapid appearance of new C. sublineolum physiological races. |
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Keywords: | Heterokaryosis vegetative compatibility parasexual cycle parameiosis mutants |
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