Research Article Diallel crosses for resistance to Macrophomina phaseolina and Thanatephorus cucumeris on cowpea.
Year: 2017
Type: article
Abstract: This study aimed at identifying and selecting through partial diallel analysis, segregating populations of cowpea resistant to Macrophomina phaseolina and Thanatephorus cucumeris, based on the evaluation of general (GCA) and specific combining ability (SCA), involved in the genetic control of resistance.For this reason, 19 grouped cowpea genotypes, considering the resistance to these pathogens, were crossed in partial diallel scheme 14 x 5, during 2013 and 2014.The 70 F 2 populations and the 19 parents were evaluated in a greenhouse as the reaction to pathogens, separately.The diallel analysis was performed according to the model of partial diallel proposed by Geraldi and Miranda Filho (1988).The additive effects predominated in the genetic control of the traits severity of charcoal rot (SEV) and area under the disease progress curve (AUDPC) to Genetics and Molecular Research 16 (3): gmr16039804 web blight, enabling the achievement of genetic gain with selection of resistant strains.Analyzing the effects of GCA, the parents BR 14-Mulato, BRS Tumucumaque and BRS Guariba, have a higher concentration of favorable alleles, highlighting, according to the values of SCA, the combinations BR 14-Mulato x MNC02-675F-4-10, BRS Tumucumaque x IT98K-1092-1, BRS Tumucumaque x MNC02-675F-4-10, BRS Tumucumaque x MNC02-675F-9-2, BRS Guariba x IT98K-1092-1, BRS Guariba x MNC02-675F-4-9, and BRS Guariba x MNC02-675F-4-10, as the most promising and indicated to obtain lines resistant to M. phaseolina and T. cucumeris in cowpea, simultaneously.
Source: Genetics and Molecular Research
DOI: 10.4238/gmr16039804
Authors: L R L Lima, K J Damasceno-Silva, M A Noronha, D A Schurt, M M Rocha
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2759341451