Evaluation of resistance in sorghum genotypes to the causal agent of anthracnose

The high degree of variability of the fungus Colletotrichum sublineolum, causal agent of sorghum anthracnose, has hindered the development of resistant hybrids. The objective of this research was to compare the aggressiveness of different fungal isolates and evaluate the genetic resistance (vertical and horizontal resistance) of various sorghum lines and hybrids. Twelve isolates, collected from different regions, were inoculated on 87 lines and 63 hybrids in the field and disease severity was evaluated. The diallel crossing method provided information about the vertical and horizontal resistance of the host, as well as the aggressiveness/ virulence of the pathogen. This genetical method was very promising for the identification of horizontal resistance in the sorghum- Colletotrichum sublineolum pathosystem, and for the prediction of anthracnose resistance in hybrids in the absence of vertical resistance. Dilatory resistance was detected in 14.94% of the inbred lines, and in 19.04% of the hybrids. Significant differences in aggressiveness and virulence of the isolates were also observed.

[1]  S. Patel,et al.  Concept of general and specific combining ability in relation to diallel crossing system. , 2010 .

[2]  L. M. C. Davide,et al.  Pathogenic variability within race 65 of Colletotrichum lindemuthianum and its implications for common bean breeding , 2009 .

[3]  R. Gates,et al.  The Dynamic Multiline Population: An Alternative Approach to Durable Resistance? , 2008 .

[4]  Monika Singh,et al.  RAPD-based SCAR marker SCA 12 linked to recessive gene conferring resistance to anthracnose in sorghum [Sorghum bicolor (L.) Moench] , 2006, Theoretical and Applied Genetics.

[5]  C. Casela,et al.  Evaluation of genetic mixtures of sorghum lines for anthracnose resistance management , 2005 .

[6]  W. Rooney,et al.  Classification and inheritance of genetic resistance to anthracnose in sorghum , 2005 .

[7]  A. S. Ferreira,et al.  Race diversity and complexity in populations of the sorghum anthracnose fungus Colletotrichum graminicola. , 2004 .

[8]  Herbert P. Silva,et al.  Mixed inheritance model for resistance to anthracnose leaf blight in maize , 2004 .

[9]  J. Zadoks,et al.  The integrated concept of disease resistance: A new view including horizontal and vertical resistance in plants , 1977, Euphytica.

[10]  J. Leslie.  Sorghum and millets diseases , 2003 .

[11]  Magno Antônio Ramalho Patto,et al.  ESTRATÉGIAS DE ANÁLISE DA REAÇÃO DE CULTIVARES DE ALGODOEIRO A PATÓGENOS 1 , 2002 .

[12]  C. Casela,et al.  Reaction of sorghum genotypes to the anthracnose fungus Colletotrichum graminicola , 2001 .

[13]  J. B. D. Santos,et al.  Identification of resistant genotypes considering polygenic systems in host-pathogen interaction , 1999 .

[14]  J. Wilson,et al.  Increasing complexity of resistance in host populations through intermating to manage rust of pearl millet. , 1999, Phytopathology.

[15]  A. S. Ferreira,et al.  AVALIACAO DA ESTABILIDADE FENOTIPICA E PREVISIBILIDADE DA RESISTENCIA DE CULTIVARES DE SORGO A COLLETOTRICHUM GRAMINICOLA , 1999 .

[16]  R. Frederiksen,et al.  DNA-Based Markers for a Recessive Gene Conferring Anthracnose Resistance in Sorghum , 1998 .

[17]  Carlos R. Casela,et al.  RESISTENCIA DILATORIA DE GENOTIPOS DE SORGO A DIFERENTES RACAS DE COLLETOTRICHUM GRAMINICOLA , 1998 .

[18]  A. S. Ferreira,et al.  Evidence for dilatory resistance to anthracnose in sorghum. , 1993 .

[19]  K. Cardwell,et al.  Pathotypes of Colletotrichum graminicola and seed transmission of sorghum anthracnose. , 1989 .

[20]  H. Warren,et al.  Physiological races of Colletotrichum graminicola on sorghum , 1987 .

[21]  A. S. Ferreira,et al.  Proposta de um sistema de classificação de raças de Colletotrichum graminicola agente causal da antracnose em sorgo (Sorghum bicolor). , 1987 .

[22]  W. A. Russell,et al.  Stability Parameters for Comparing Varieties , 1966 .

[23]  B Griffing,et al.  Concept of general and specific combining ability in relation to diallel crossing systems , 1956 .