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CROP BREEDING, GENETICS & CYTOLOGY

Analysis of Resistance to Ergot in Sorghum and Potential Alternate Hosts

^a Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506
^b Dep. of Plant Pathology, Kansas State Univ., Manhattan, KS 66506

* Corresponding author (mtuinstra{at}bear.agron.ksu.edu)

Ergot (caused by Claviceps africana Frederickson, Mantle & de Milliano) of sorghum [Sorghum bicolor (L.) Moench] recently has become a global disease problem and is a major threat to hybrid seed production. Host-plant resistance is one option for control; however, the genetic and physiological bases for ergot resistance are poorly understood. The objective of this study was to evaluate resistance to C. africana in 18 genetically diverse sorghum lines, including cultivated landraces and wild accessions, as well as in potential alternate hosts, including grassy weeds and range grasses commonly found in sorghum-producing areas in the central Great Plains of the USA. These entries were evaluated for ergot resistance in the greenhouse following spray inoculation with conidial suspensions during flowering. The results of this analysis indicated that only Sorghum ssp. were susceptible to ergot; however, within the sorghum germplasm pool, several wild accessions were identified with resistance to ergot. Two of these resistant entries, IS14131 and IS14257, were characterized further in male-sterile (A3 cytoplasm) genetic backgrounds to evaluate the physiological basis for their resistance. Parent lines, male-sterile hybrids, and susceptible checks were evaluated for ergot resistance following spray inoculation with ergot in experiments in a winter nursery at Guayanilla, Puerto Rico, and in a greenhouse at Manhattan, KS, during the winter and spring of 2000. The expression of ergot resistance in IS14131 and IS14257 and in corresponding male-sterile hybrids suggests that these sorghums may harbor genes for resistance to ergot.

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				J. D. Reed, M. R. Tuinstra, N. W. McLaren, K. D. Kofoid, N. W. Ochanda, and L. E. Claflin Analysis of Combining Ability for Ergot Resistance in Grain Sorghum Crop Sci., November 1, 2002; 42(6): 1818 - 1823. [Abstract] [Full Text] [PDF]