Degree Type
Thesis
Date of Award
2006
Degree Name
Master of Science
Department
Agronomy
First Advisor
Walter R. Fehr
Abstract
Seedling emergence of low-phytate (LP) soybean [Glycine max (L.) Merr.] lines has been reported to be lower than that of normal-phytate (NP) lines. One objective of this study was to evaluate if backcrossing the LP trait into a NP line would result in LP progeny with normal emergence. The LP line CX1834-1-6 (CX1834) was crossed to B01769B019 (B019), a NP line with reduced palmitate content, and three backcrosses were made to B019. A total of 36 BC3F4-derived LP lines from the population were evaluated at five locations in 2005 in comparison with CX1834, B019, and a NP cultivar IA3023. The mean phytate P and inorganic P content of all the backcross lines was not significantly different from CX1834. There were 18 backcross lines that had a mean field emergence that was significantly greater than CX1834 and not significantly different from B019. The results indicated that backcrossing seemed to be successful for developing LP lines with normal field emergence. A second objective of the study was to determine the effectiveness of warm germination, cold vigor, and accelerated aging tests for predicting field emergence of LP lines. Fifteen of the backcross lines were evaluated in the three tests that represented the range of field emergence that had been observed. The tests were useful for identifying lines with inferior field emergence, but were not reliable enough to replace field tests for identifying the best emerging lines.
DOI
https://doi.org/10.31274/rtd-180813-8810
Publisher
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu
Copyright Owner
Jordan Dustin Spear
Copyright Date
2006
Language
en
Proquest ID
AAI1439894
File Format
application/pdf
File Size
68 pages
Recommended Citation
Spear, Jordan Dustin, "Genetic improvement of seedling emergence of soybean lines with low phytate " (2006). Retrospective Theses and Dissertations. 862.
https://lib.dr.iastate.edu/rtd/862