Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 4, 2000
Publication Date: N/A
Technical Abstract: RI populations offer several advantages for QTL mapping over F2 or backcross populations. Since a genotype is represented by an inbred line, rather than by an individual, a more accurate assessment of the genetic component of variance can be made by evaluating in different environments. Sometimes it is difficult to develop a large number of RI lines using single seed descent (SSD). Thus, it is useful to find other convenient ways to develop a large RI population. We have applied bulk-selfing then single plant selection in later generation to develop RI lines from 96 F2 individuals of upland cotton cross MARCABUCAG8US-1-88 X HS 46. Before using these, we need to know the QTL mapping properties of RI lines derived by this technique. In this study we compared the properties of QTL mapping among bulk-selfing RIL population, DH population and SSD RIL population through Monte Carlo simulations. The simulation results indicated that these RI lines derived by the bulk selfing technique could be used on QTL mapping. This technique provides several advantages during the process of the developing of RI lines for different crops. 1) Large genetic variation may be maintained by keeping a number of lines in each F2-derived family. 2) This method may reduce genetic drift compared to the single seed descent method. 3) This is an easy and economically affordable way to keep a large family size. 4) With this method one may also develop several RIL populations simultaneously from one cross if each family has a number of lines.