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Evaluación de la Antibiosis, Antixenosis, y Tolerancia de Melanaphis sacchari/sorghi¹ en Híbridos de Sorgo

Perales-Rosas, Daniel, Hernández-Pérez, Ricardo, López-Martínez, Víctor, Andrade-Rodríguez, María, Alia-Tejacal, Irán, Juárez-López, Porfirio, Perdomo-Roldán, Francisco, Guillén-Sánchez, Dagoberto
TheSouthwestern entomologist 2019 v.44 no.3 pp. 763-770
Melanaphis sacchari, Sorghum bicolor, antibiosis, antixenosis, breeding programs, chlorophyll, cultivars, dominant genes, genotype, hybrids, insect resistance, insects, leaf area, seed industry, Mexico
To date, there is limited information on sources of resistance to Melanaphis sacchari/sorghi, in Sorghum bicolor (L.) Moench hybrids. These cultivars are sold by different seed companies in Mexico, basing their recommendations fundamentally on the potential yield of each genotype. So, there are no specific breeding programs that use sources marked from progenitors with dominant genes that confer resistance or tolerance to the insect. The objective of this study was to evaluate resistance mechanisms such as antixenosis, antibiosis, and tolerance in six commercial sorghum hybrids against M. sacchari at Morelos. Preliminary results indicated the aphid had less preference (antixenosis) for Ambar, P15, and Milenia hybrids. The antibiosis shown through the Lower Intrinsic Rate of Population Increment (rm), occurred in genotypes Ambar and 85 P 20, and there is evidence of tolerance based on the variables leaf area (AF), dry weight (PS), and chlorophyll index (Cl), with Ambar, Cobalt, and 85 P 20. These results should be considered an important advance in future management strategies and programs for the control of M. sacchari/sorghi in sorghum.