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Fig. 2.1 Generation of RILs by successive selfings: two parental lines are crossed to produce an
F1. The F1 is then selfed to obtain an F2. The selfing process continues until a certain level of
homozygosity is reached. The end product consists of a set of RILs, each of wich is a fixed
recombinant of the parental lines. HIFs individuals are derived from RILs in wich a small portion
of the genome is still heterozygous (shown in red rectangle). Selfing such a RIL, it is possible to
obtain individuals fixed for parental
s 1 or parental
s 2 allele. Only one chromosome pair is shown
'
'
for each individual
(Wang et al. 2012 ). It is known that plants, which tolerate salinity are able to
maintain a flux of Na + between shoots and roots in order to keep the ratio Na + /K + as
low as possible. The authors identified several major QTLs for salt tolerance and
one of them, named qSNC11, will be suitable for use in marker-assisted selection
when developing new salinity-tolerant cultivars.
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