Physiology and Molecular Biology of Stress ... - KHAM PHA MOI

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Table 4. Some examples of genetic transformation resulting in
enhanced salt tolerance
Gene Function Origin Transgenic Reference
plant
Atcys-3A cysteine synthesis Arabidopsis yeast Romero et al., 2001
AgNHK1 Na/H antiporter Atriplex gmelini rice Ohta et al., 2002
AtNHX1 Na/H antiporter Arabidopsis yeast Aharon et al., 2003
HKT1 K transporter wheat Florida wheat Laurie et al., 2002
AtHKT1 Na/K transporter Arabidopsis yeast Uozumi et al., 2000
HAL1 K/Na selectivity Yeast tomato Rus et al., 2001
RS domains splicing proteins Arabidopsis yeast Forment et al.,
2002
AhDREB1 DNA binding Atriplex tobacco Shen et al., 2003
protein
hortensis
BveIF1A translation initiation sugar beet Arabidopsis Rausell et al., 2003
DsALDP fructose-1,6- Dunaliella tobacco Zhang et al., 2003
diphosphate aldolase salina
10. BREEDING FOR SALINITY TOLERANCE AND IMPROVING
SALT TOLERANCE OF PLANTS
Although plant breeding for improved salt tolerance in crops can’t be the only approach
in resolving the problem of increasing salinity throughout the world, it should
be considered as part of a total package (together with the management of irrigation and
drainage, as well as application of proper agricultural practices) which aims to utilize the
salt-affected land in a sustainable way. Resistance to saline conditions can be increased
beyond the existing phenotypic range by selecting individual physiological
traits contributing to salt tolerance and combining them in breeding programs (Khatun
et al., 1995).
There are several ways of dealing with the problem of salinity, as indicated by
Flowers and Yeo (1995), such as: direct use of halophytes, (relatively cheap method of
domestication of salt-tolerant plants) incorporation of genetic information for salt