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The Journal of Heredity 1979:70(1):5-8
© 1979 The American Genetic Association 70:5-8

research-article

Genetic evidence for the origin of diploid megagametophytes in Citrus

ASIM ESEN, ROBERT K. SOOST, and GUISEPPE GERACI

The authors are affiliated, respectively, with the Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061; the Department of Plant Sciences, University of California, Riverside, CA 92521; and Centro Miglioramento Genetico Degli Agrumi, Palermo, Italy

Abstract

Tetraploid progeny from three 2x x 4x crosses were screened for a phenolic substrate that produces browning in young shoot homogenates of Citrus upon oxidation by polyphenol oxidase and is controlled by the br locus. The progeny of the one cross showed no segregation; all contained the phenolic substrate. However, two crosses produced segregating progeny; the ratio of those containing the substrate to those lacking it was close to 11: 1. The data were subjected to half-tetrad analysis in order to gain insight into the mechanism responsible for the production of diploid megagametophytes. On the basis of half-tetrad analysis data, it was concluded that the omission of the second meiotic division or endoduplication in the functional megaspore led to the production of diploid megagametophytes.


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A. Vardi, I. Levin, and N. Carmi
Induction of Seedlessness in Citrus: From Classical Techniques to Emerging Biotechnological Approaches
J. Amer. Soc. Hort. Sci., January 1, 2008; 133(1): 117 - 126.
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