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Somaclonal variation in seed germination of dallisgrass biotypes

Published online by Cambridge University Press:  12 February 2007

W.D. Pitman ,
S.S. Croughan ,
J.L. Nash  and
B.C. Venuto
W.D. Pitman*
Affiliation:
Louisiana State University Agricultural Center, Rosepine Research Station, P.O. Box 26, Rosepine, LA 70659, USA
S.S. Croughan
Affiliation:
Louisiana State University Agricultural Center, Rice Research Station, Crowley, LA 70657, USA
J.L. Nash
Affiliation:
Louisiana State University Agricultural Center, Rice Research Station, Crowley, LA 70657, USA
B.C. Venuto
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Grazinglands Research Laboratory, 7207 West Cheyenne Street, El Reno, OK 73036, USA
*
*Corresponding author: E-mail: wpitman@agcenter.lsu.edu
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Abstract

Dallisgrass (Paspalum dilatatum Poir.) is an important pasture grass on moist fertile sites in warm climates, however, it is limited in use by periodic low seed quality and resulting erratic availability and establishment difficulties. Due to apomictic reproduction, common pentaploid dallisgrass has not been responsive to traditional plant improvement approaches. Recent research has shown potential for some improvement in forage production and plant persistence with apomictic hexaploid varieties of dallisgrass. Tissue-culture regeneration has been reported to produce somaclonal variation in seed germination of common pentaploid dallisgrass and has recently resulted in availability of potentially useful regenerants of hexaploid dallisgrass. Seed of selected plants from both field and greenhouse environments was evaluated in replicated germination trials to determine whether hexaploid tissue-culture regenerants responded similarly to regenerants from common dallisgrass and to determine whether regenerants expressing potential agronomic usefulness as indicated by preliminary observations differed in germination. The eight germination trials included 299 regenerants with 57 of these being duplicate entries among trials. Germination did not differ among sources of regenerants. Within sources germination differed among regenerants with a few individuals exceeding germination percentage of parent lines in one evaluation of greenhouse-produced seed. Individual regenerants with agronomic potential and high percentage seed germination were identified. The results demonstrate that tissue-culture regeneration can be used to produce improved germination in agronomically useful genotypes of apomictic dallisgrass and suggest that such potential may exist for other recalcitrant plant species.

Keywords

forage grassgerminationPaspalum dilatatumsomaclonal variation
Type
Research Article
Information
Plant Genetic Resources , Volume 3 , Issue 3 , December 2005 , pp. 414 - 420
Copyright
Copyright © NIAB 2005

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