Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 21:271-276 (1981)
© 1981 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Irwin, J. A. G.
Right arrow Articles by Bingham, E. T.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Irwin, J. A. G.
Right arrow Articles by Bingham, E. T.
Agricola
Right arrow Articles by Irwin, J. A. G.
Right arrow Articles by Bingham, E. T.

Inheritance of Resistance to Phytophthora megasperma in Diploid Alfalfa1

J. A. G. Irwin, D. P. Maxwell and E. T. Bingham2

Few genetic studies have been made to determine the inheritance of disease resistance in diploid alfalfa (Medicago saliva L.). The objectives of this study were to determine the inheritance of resistance to Phytophthora root rot in Wisconsin cultivated diploid alfalfa (CADL) and in diploid Medicago coerulea Less. (PI 299046).

S1 populations and F1 populations from crosses of resistant and susceptible plants of CADL were generated, and their segregations for disease reaction indicated that resistance was conditioned by two dominant complementary genes, designated Pm1 and Pm2. The observed segregations in S2 F2 testcross families of CADL provided additional evidence to support this model. Segregations for resistance to Phytophthora root rot in S1, F1 and F2 families from intercrosses of two resistant Medicago coerulea plants and two susceptible CADL plants indicated that resistance in M. coerulea was complex, and that epistatic relationships might be of importance.

These studies indicate the potential usefulness of diploid alfalfa as new sources of resistance to Phytophthora root rot.

Key Words: Phytophthora megasperma Drechs. f. sp. medicaginis • Medicago sativa L. • Medicago coerulea Less. • Complementary dominant genes •

1 Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin-Madison, Hatch Project 5132, and EPA Grant No. 806277010. The senior author was also supported by the Queensland (Australia) Public Service Board and an Australian Meat and Livestock Corporation post-graduate scholarship. The authors express their appreciation to Dr. R. R. Smith and Dr. D. C. Arny for their critical review of the manuscript.

2 Graduate research assistant and professor, Dep. of Plant Pathology, and professor, Dep. of Agronomy, Univ. of Wisconsin-Madison, Madison, WI 5S706.

Received for publication March 10, 1980.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1981 by the Crop Science Society of America.