The best strategy to pyramid or introduce multiple genes and recover a maximum recurrent parent background effect in the shortest time will be to take up the transfer of genes simultaneously, generate a large backcross population and select the target genes through foreground selection and flanking marker analysis to reduce the persistent linkage drag (Rajpurohit et al.2011 Ye,20100).2011 Ye,2010
The problem of persistent linkage drag when selecting for Xa21 may due to the fact that Xa21 was derived from IRBB21, which inherited the chromosomal region containing Xa21 from the wild species Oryza longistaminata through several cycles of backcrossing with indica rice (Song et al. 1995).
Of the five single gene selections, SSIIa, Sub1, xa5, Xa21 and TPS, only selection for Xa21 showed large, persistent linkage drag.
Persistent linkage drags when selecting for BB genes have been reported in several backcross breeding programs, such as during the transfer of Xa4 + xa5 + Xa21 from indica 'IRBB57' into japonica 'Mangeumbyeo' (Suh et al. 2013), and pyramiding of the BB resistance genes Xa21 and xa13 and a semi-dwarfing gene (sd-1) from PR106-P2 inTypeype 3 Basmati (Rajpurohit et al. 2011).
Our findings suggest that persistent linkages between sister chromosomes are created at replication origins in the absence of prokaryotic condensin, especially during fast DNA replication.
"The Whitney has been a very energetic linkage to Columbia.
They can't see a direct linkage to Saddam Hussein.
Only those who demonstrate direct linkage to a slave?
One linkage, to chromosome Ilql3, has been established previously5.
Belter, H.J.: Data interpretation and linkage to large scale anomalies.
Chen, J.J. et al. A novel linkage to generalized vitiligo on 4q13 q21 identified in a genomewide linkage analysis of Chinese families.
