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Correlation of Mitochondrial DNA Restriction Endonuclease Patterns with Sterility Expression in Six Male-Sterile Sorghum Cytoplasms¹

Six cytoplasmic male-sterile sorghum, Sorghum bicolor (L.) Moench, lines (KS34 through KS39), which have cytoplasms from sources other than the milo group, were tested for fertility expression in F₁ hybrids produced with nine lines, and their organelle DNAs were examined by restriction endonuclease fragment analysis. Three of the KS lines had cytoplasms indistinguishable from milo male-sterile cytoplasm; the remaining three lines differed from milo both in fertility response and their mitochondrlal DNA restriction patterns. Chloroplast DNA restriction patterns of all six KS lines were indistinguishable from that characteristic of milo chloroplast DNA. The results indicate a relationship between mitochondrial DNA and genetic behavior of the male-sterile cytoplasms. These cytoplasms may be useful in broadening the cytoplasmic base of hybrid sorghum production.

Key Words: Chloroplast DNA • Cytoplasmic male sterility • Fertility restoration • Sorghum bicolor (L.) Moench.

² Formeresearch associate, Dep. of Plant Pathology, Univ. of Florida, Gainesville, FL 32611, currently Agricultural Division, The Upjohn Co., Kalamazoo, MI 49001; research plant pathologist, USDA, ARS and Dep. of Plant Pathology, Univ. of Florida, Gainesville, FL 32611; research geneticist, USDA, ARS and Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843; and research geneticist, USDA, ARS and Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication May 4, 1981.