Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 23:73-75 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Trichomes in Segregating Generations of Sorghum Matings. I. Inheritance of Presence and Density1

P. T. Gibson and R. K. Maiti2

The presence of trichomes on the leaves of sorghum [Sorghum bicolor (L.) Moench] is associated with reduced susceptibility to shootfly (Atherigona soccata Rond.) attack. Segregation ratios in successive generations of five single-cross matings between trichomed and trichomeless parents indicated that the presence of leaf-blade trichomes is recessive and controlled by a single locus. Inheritance of the trichome trait in three matings among four trichomed parents involved the same locus. The symbol tr is proposed for the gene controlling trichome presence.

Trichome density on the abaxial leaf lamina varied among trichomed lines derived from single-cross matings. Standard unit heritability for F4 on F3. estimated only in the cross IS 1054 x B CK60, was 0.75 on a plot basis.

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

1 Journal Article No. 205 of the Int. Crops Res. "Inst. for the Semi-Arid Tropics, ICRISATP atancheru P.O., Andhra Pradesh 502324, India, and Journal Paper No. J-10422 of the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA 50011, Project No. 2447. Part of the dissertation submitted by the senior author to Iowa State Univ. in partial fulfillment of the requirements for the Ph.D. degree.

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

Received for publication February 22, 1982.


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