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Inheritance of Resistance to Macrophomina phaseolina (Tassi) Goid. and Fusarium moniliforme Sheldom in Sorghum
Author(s) -
BramelCox P. J.,
Stein I. S.,
Rodgers D. M.,
Claflin L. E.
Publication year - 1988
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1988.0011183x002800010009x
Subject(s) - macrophomina phaseolina , sorghum , biology , stalk , inoculation , fusarium , hybrid , horticulture , panicle , diallel cross , sorghum bicolor , agronomy , botany
Lodging of grain sorghum [ Sorghum bicolor ] a serious problem under certain environmental conditions such as water stress or heat stress. Lodging at the base of the stalk or the base of the panicle has been attributed to a complex of stalk rotting organisms, which includes Macrophomina phaseolina (Tassi) Goid and Fusarium moniliforme Sheldon. The field study reported here evaluated the use of a toothpick inoculation technique to artificially infect plants with these two organisms and determined inheritance of resistance. The experimental material consisted of the 45 F 1 's from a 10‐parent diallel with no reciprocals, the 10 parents, and five hybrid checks grown in 2 yr under two water regimes. The inoculated and noninoculated plants in a plot were rated for stalk disintegration on a scale of 1 (resistant) to 6 (susceptible). Hybrids differed nificantly and consistently across environments for the two inoculation treatments but not for the noninoculated. General combining ability was significant in both dryland environments for both inoculation treatments; specific combining ability was significant for F. moniliforme in both years but only in 1984 for M. phaseolina . The expression of resistance seems to depend upon the environment, especially for F. moniliforme .