Linkage relationships between regulatory and structural gene loci involved in zein synthesis in maize |
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Authors: | C. Soave N. Suman A. Viotti F. Salamini |
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Affiliation: | (1) Laboratorio per lo studio delle biosintesi vegetali nelle piante di interesse agrario, Milano, Italy;(2) Istituto sperimentale per la Cerealicoltura, Sezione di Bergamo, Bergamo, Italy |
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Abstract: | Summary The synthesis of at least 15 zein polypeptides is under the control of regulatory gene loci. One of these, Opaque-2 (chromosome 7, position 16) strongly reduces the zein accumulation without modifying the zein molecular components. The linkage relationship between the regulatory gene 02 and the 5 structural loci (Zp1, Zp2, Zp3, Zp6, Zp12) segregating with sample Mendelian ratios have been studied. Zp1, Zp2, Zp3 are closely linked to each other; moreover this gene cluster is located on chromosome 7 at 5.5 cM from the Opaque-2 locus. The structural loci Zp6 and Zp12 are not linked with each other, with the 02 locus or with Zp1, Zp2, Zp3. From our data it follows that the zein structural genes are located in at least three positions on the maize genome. The scattering in the genome of the genes controlled by the Opaque-2 locus suggests a transacting role for this regulatory element. |
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Keywords: | Zein synthesis Gene regulation Opaque-2 linkage relationships |
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