| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
USDA-ARS, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
* Corresponding author (krlamkey{at}iastate.edu).
Iowa Stiff Stalk Synthetic (BSSS) and Iowa Corn Borer Synthetic #1 (BSCB1) are undergoing reciprocal recurrent selection as part of Iowa's Federal-State maize (Zea mays L.) breeding program. This study focused on molecular genetic variation in BSSS(R) and BSCBI(R) cycle 0 (CO) and cycle 12 (C12) populations, as well as the inbred progenitor lines (P) used to synthesize BSSS and BSCB1. The objectives were to quantify amounts of genetic variation within populations, to estimate what proportion remained after selection, and to compare genetic diversities between BSSS and BSCB1 populations. Genotypic data for 82 restriction fragment length polymorphism (RFLP) loci were collected from 100 randomly sampled individuals from each CO and C12 population, 16 BSSS(R) progenitors, and 12 BSCBI(R) progenitors. Progenitor lines were highly homozygous as expected. No single progenitor made excessive genetic contributions to CO or C12. The BSSS and BSCB1 progenitor populations were initially genetically similar (Nei's genetic distance = 0.07). After 12 cycles of selection, they substantially diverged (Nei's distance = 0.66). Gene diversity (expected heterozygosity under random mating) across progenitor populations was very broad (mean gene diversity = 0.6) and remained at that level to C12. Within both populations, the polymorphism level decreased from about 99 to 75%, and gene diversity decreased from about 0.6 to 0.3 between P and C12. The mean number of alleles per locus dropped from about four to less than three. Assuming an effective population size as the mean number of selected S1 lines over 12 cycles, the observed loss of variation was consistent with theoretical expectations resulting from genetic drift of neutral alleles.
This article has been cited by other articles:
|
|
 |
|
  A. R. Hallauer History, Contribution, and Future of Quantitative Genetics in Plant Breeding: Lessons From Maize Crop Sci., December 18, 2007; 47(Supplement_3): S-4 - S-19. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. L. Hinze, S. Kresovich, J. D. Nason, and K. R. Lamkey Population Genetic Diversity in a Maize Reciprocal Recurrent Selection Program Crop Sci., October 27, 2005; 45(6): 2435 - 2442. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. C. Ho, S. Kresovich, and K. R. Lamkey Extent and Distribution of Genetic Variation in U.S. Maize: Historically Important Lines and Their Open-Pollinated Dent and Flint Progenitors Crop Sci., August 26, 2005; 45(5): 1891 - 1900. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. V. Butruille, H. D. Silva, S. M. Kaeppler, and J. G. Coors Response to Selection and Genetic Drift in Three Populations Derived from the Golden Glow Maize Population Crop Sci., September 1, 2004; 44(5): 1527 - 1534. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. A. Menz, R. R. Klein, N. C. Unruh, W. L. Rooney, P. E. Klein, and J. E. Mullet Genetic Diversity of Public Inbreds of Sorghum Determined by Mapped AFLP and SSR Markers Crop Sci., July 1, 2004; 44(4): 1236 - 1244. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Guo, M. A. Rupe, C. Zinselmeier, J. Habben, B. A. Bowen, and O. S. Smith Allelic Variation of Gene Expression in Maize Hybrids PLANT CELL, July 1, 2004; 16(7): 1707 - 1716. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Hagdorn, K. R. Lamkey, M. Frisch, P. E. O. Guimaraes, and A. E. Melchinger Molecular Genetic Diversity among Progenitors and Derived Elite Lines of BSSS and BSCB1 Maize Populations Crop Sci., March 1, 2003; 43(2): 474 - 482. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. A. Labate, K. R. Lamkey, S. E. Mitchell, S. Kresovich, H. Sullivan, and J. S. C. Smith Molecular and Historical Aspects of Corn Belt Dent Diversity Crop Sci., January 1, 2003; 43(1): 80 - 91. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Popi, J. Rajnpreht, L.W. Kannenberg, and K.P. Pauls Random Amplified Polymorphic DNA-Based Evaluation of Diversity in the Hierarchical, Open-Ended Population Enrichment Maize Breeding System Crop Sci., May 1, 2000; 40(3): 619 - 625. [Abstract] [Full Text]
|
|
|
|
|
|
P. S. Guzman and K. R. Lamkey Effective Population Size and Genetic Variability in the BS11 Maize Population Crop Sci., March 1, 2000; 40(2): 338 - 346. [Abstract] [Full Text]
|
|
| 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 | |||
