|May Iii, Oscar|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/15/1998
Publication Date: N/A
Technical Abstract: Monsanto leads in efforts to incorporate value added traits into cotton cultivars. As part of Monsanto's discovery program, Deltapine 50 (DP 50) plants with increased fiber strength were recently discovered after particle bombardment transformation. The inserted sequences included a GUS marker gene and a proprietary plasmid containing a fiber specific promoter. Non-mendelian segregation for fiber strength and GUS were noted in some small R3 and R4 populations isolated from the original R0 plant. Thus, the objective of this study was to examine some large populations to determine the heritability and expression of fiber strength under field conditions. Fiber strength of most GUS-positive plants was increased from 5-10 g/tex over DP 50. Non-mendelian segregation for GUS and fiber strength were noted in some progeny rows, BC1F1s, and F2s. Although no commercial product is imminent from this research, we are continuing breeding efforts to isolate a germplasm with stable expression of increased strength.