About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 37 No. 4, p. 1351-1360
     
    Received: Apr 8, 1996


    * Corresponding author(s): bkindige@tag.gov
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2135/cropsci1997.0011183X003700040053x

The Reproductive Versatility of Eastern Gamagrass

  1. B. Kindiger  and
  2. C. L. Dewald
  1. USDA-ARS, Southern Plains Range Res. Stn., 2000 18th St., Woodward, OK 73801

Abstract

Abstract

Eastern gamagrass [Tripsacum dactyloides (L.) L.], a native, warmseason species, is a nutritious and palatable forage for grazing livestock. The grass has potential for rangeland and pasture improvement. This field study was conducted over 10 yr and one location to determine the reproductive characteristics of the various cytotypes of Tripsacum and identify methods for breeding agronomically superior cultivars. Intra- and interspecific crosses were made and evaluated between several Tripsacum cytotypes. Cytological and polymerase chain reaction-random amplified polymorphic DNA (PCR-RAPD) techniques were used to identify methods of reproduction and types of individuals generated. Results of the study identified two methods for facilitating horizontal gene flow among sexual and apomictic cytotypes. Materials with triploid and hexaploid constitutions were essential in the movement of sexual germplasm into apomictic tetraploids and of tetraploid germplasm into sexual diploids, respectively. Triploids and hexaploids were useful materials to introgress and transfer desirable alleles across species, cytotypes, and reproductive barriers. In addition, the generation of triploid and hexaploid genotypes will continue to exert major influences on Tripsacum evolution and speciation. This study identified additional methods and systems for improving Tripsacum germplasm by utilizing its distant relative maize (Zea mays L.) in a breeding or genetic evaluation program.

All programs and services of the U.S. Department of Agriculture are offered on a nondiscriminatory basis without regard to race, color national origin, religion, sex, age, martial status, or handicap.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .