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Published in Crop Sci 23:76-79 (1983)
© 1983 Crop Science Society of America
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Trichomes in Segregating Generations of Sorghum Matings. II. Association with Shootfly Resistance1

R. K. Maiti and P. T. Gibson2

The shootfly (Atherigona soccata Rond.) is a major seedling pest of sorghum in Asia and Africa. To determine whether the presence of nonglandular trichomes on the leaf lamina was associated with resistance to shootfly, trichomed, segregating, and trichomeless F2— derived lines in the F3 and F4 from four trlchomed x trichomeless sorghum matings and their parents were studied at ICRISAT Center, Patancheru, India. Trichomed lines had significantly lower percentages of plants with shootfly eggs 18 days after emergence and of deadhearts (killed central shoot) at both 18 and 23 or more days after emergence. The ratio of the difference between the means of trichomed and trlchomdess lines for the percentage of deadhearts to the corresponding difference between the parents ranged from 0.16 to 0.92 and exceeded 0.32 in seven of nine comparisons. Thus, trichomes were clearly a major factor, but not the only factor, involved in resistance. Means of the parents and trichomed, segregating, and trichomeless offspring were regressed on four possible genetic models. The results indicated that at least two additional loci that interact with each other were involved in resistance. Trichome density was examined as a possible factor in resistance, but correlation of deadheart percentage with the density of trichomes was low and nonsignificant.

Key Words: Sorghum bicolor (L.) Moench • Atherigona soccata Rond. • Trichome density • Ovipositlon nonpreference

1 Journal Article No. 194 of the Int. Crops Res. Inst. for the Semi-Arid Tropics, ICRISAT Patancheru P.O., Andhra Pradesh, 502 324, India, and Journal Paper No., J-10425 of the Iowa Agric. and Home Econ. Exp. Stn., Ames, Iowa, Project No. 2447. Part of this investigation is included in the dissertation submitted by P.T. Gibson to Iowa State Univ. in partial fulfillment of the requirements for the Ph.D. degree

2 Sorghum physiologist, ICRISAT, and former research scholar, ICRISAT, (currently assistant professor, Dep. of Plant and Soil Science, Southern Illinois Univ., Carbondale, IL 62901), respectively.

Received for publication February 22, 1982.




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