Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:229-231 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Culm Breakage on Seed Set in Seven Paspalum Species and an Intraspecific Hybrid1

Hugh W. Bennett and Byron L. Burson2

The specific effect of culm breakage upon seed set was measured in (a) seven Paspalum species; (b) the intraspecific hybrid between the sexual and apomictic P. dilatatum biotypes; and (c) segregates from this hybrid through the F0 generation. Sixteen inflorescences of each were individually bagged at various stages of anthesis. Half of these were broken when bagged and half kept upright. Further breakage was prevented by supporting all culms until harvest. All the florets produced on each inflorescence were used to determine seed set. Significant differences in seed set when bagged at various stages of anthesis (before bloom 8.6%, one-half bloom 20.9%, and complete bloom 26.8%) were found for all plants except the segregating generations from the intraspecific hybrid. Culm breakage caused a highly significant reduction in seed set in P. guenoarum (30.0-10.8%), nicorae (26.1-10.7%), P. notatum (23.9-4.3%), sexual dilatatum (49.6.20.0%) and a significant reduction in urvillei (30.3-18.1%) and apomictic P. dilatatum (14.8-8.2%). There was no significant reduction due to culm breakage in the short-stemmed and small-panicled P. pumilum. This study indicates the value of practices to reduce culm breakage in seed production or in a breeding program with Paspalum species.

Key Words: Bagging procedure • Segregates • Seed production

1 Cooperative investigations of the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the Mississippi Agricultural Experiment Station, State College 39762. Approved for publication as Journal Article No. 1958, Mississippi Agricultural Experiment Station.

2 Research Agronomist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture; and Assistant Professor of Agronomy, Mississippi State University.

Received for publication August 12, 1970.




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Copyright © 1971 by the Crop Science Society of America.