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Published in Crop Sci 22:414-421 (1982)
© 1982 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Organelle Genome Diversity in Sorghum: Male-Sterile Cytoplasms1

D. R. Pring, M. F. Conde and K. F. Schertz2

Seventeen sorghum [Sorghum, bicolor (L.) Moench] cytoplasms, 16 of which were male-sterile, were compared by restriction endonuclease fragment analysis of mitochondrial (mt) and chloroplast (ct) DNA in a survey of cytoplasmic variation in Sorghum spp. The widely used malesterile (milo) cytoplasm exhibited mt and ctDNAs which differed from normal, fertile (kafir) cytoplasm. Seven groups of male-sterile cytoplasms were differentiated by mtDNA restriction fragment differences, while only three were differentiated by ctDNA; thus a greater degree of variability of the mitochondrial genome is suggested. Strict maternal inheritance of mt and ctDNAs was demonstrated. Both organelle DNAs appear to share similar evolutionary relationships based on restriction fragment patterns. The potential utility of organelle DNA variation in the identification and differentiation of male sterility sources in sorghum is discussed.

Key Words: Sorghum bicolor(L) Moench • Mitochondrial DNA • Chloroplast DNA • Restriction endonuclease fragment analysis

1 Contribution of USDA, SEA-AR, Inst. of Food and Agric. Sci., Univ. of Florida, and Texas Agric. Exp. Stn. Florida Agric. Exp. Stn. Journal Series No. 2484

2 Research plant pathologist, USDA, ARS, former research associate, Dep. of Plant Pathology, Univ. of Florida, Gainesville, FL 32611 (present address, Agricultural Division, The Upjohn Co., Kalamazoo, M1 49001); and research geneticist, Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843

Received for publication May 4, 1981.




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