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Mitochondrial DNA from Maize Hybrids with Normal and Texas Cytoplasms1

Dilip M. Shah, C. S. Levings

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Abstract

Mitochondrial DNA (mtDNA) was isolated from two hybrids of maize (Zea mays L.), NC232 ✕ T204N (normal cytoplasm) and NC232 ✕ T204 cms T (Texas cytoplasm). No difference was found in the buoyant densities of mtDNA isolated from the two hybrids. The mtDNA had a buoyant density of 1.706 g/cm3 in CsCl and a molar % guanine plus cytosine of 46.9. Therefore, the cytoplasmic dissimilarities with respect to sterility and disease response between the normal and the Texas cytoplasm cannot be accounted for by detectable alterations in the base composition of mtDNA.

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What this paper is about

Mitochondrial DNA (mtDNA) was isolated from two hybrids of maize (Zea mays L.), NC232 ✕ T204N (normal cytoplasm) and NC232 ✕ T204 cms T (Texas cytoplasm). No difference was found in the buoyant densities of mtDNA isolated from the two hybrids. The mtDNA had a buoyant density of 1.706 g/cm3 in CsCl and a molar % guanine plus cytosine of 46.9. Therefore, the cytoplasmic dissimilarities with respect to sterility and disease response between the normal and the Texas cytoplasm cannot be accounted for by detectable alterations in the base composition of mtDNA.

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OpenAlex reports 13 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

Mitochondrial DNA (mtDNA) was isolated from two hybrids of maize (Zea mays L.), NC232 ✕ T204N (normal cytoplasm) and NC232 ✕ T204 cms T (Texas cytoplasm). No difference was found in the buoyant densities of mtDNA isolated from the two hybrids. The mtDNA had a buoyant density of 1.706 g/cm3 in CsCl and a molar % guanine plus cytosine of 46.9. Therefore, the cytoplasmic dissimilarities with respect to sterility and disease response between the normal and the Texas cytoplasm cannot be accounted for by detectable alterations in the base composition of mtDNA.

Key concepts: Mitochondrial DNA, Biology, Cytoplasmic male sterility, Cytoplasm, Cytosine, Hybrid, Extranuclear inheritance, DNA

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