Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:349-350 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Graft Compatibility and Its Influence on Self- and Cross-fertility in Selected Species of Melilotus1

O. A. Ojomo and H. J. Gorz2

A high degree of graft compatibility was observed between plants of Melilotus infesta Guss. and four closely related species, M. italica (L.) Lam., M. messanensis (L.) All., M. segetalis (Brot.) Ser., and M. sulcata Desf. Similar self-fertility values were observed with and without grafting. No hybrid seeds were obtained from approximately 400 pollinations made on grafted plants. Thus, crossfertility also did not improve after grafting. Interspecific incompatibility in Melilotus appears to be due primarily to genetic barriers, but environmental factors also are apparently involved.

Key Words: sweetclover • Interspecific hybridization

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Nebraska Agricultural Experiment Station, Lincoln, Nebraska 68503. Supported in part by the U. S. Agency for International Development. Published with the approval of the Director as Paper No. 2440, Journal Series, Nebraska Agricultural Experiment Station. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree.

2 Senior Research Officer, Research Division, Ministry of Agriculture and Natural Resources, Ibadan, Western State, Nigeria, (formerly graduate student, Department of Agronomy, University of Nebraska), and Research Geneticist, Crops Research Division, ARS, USDA, Lincoln, Nebr.

Received for publication November 22, 1968.




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