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New evidence
of QTLs attributed to salinity tolerance in rice
Hossein
Sabouri1* and Atefeh Sabouri2
1Department
of Plant Production, Gonbad High Education Center, Gorgan
University of Agriculture Science and Natural Resource,
Iran.
2Department
of Agronomy and Plant Breeding, Faculty of Agriculture
Sciences, University of Guilan, P.O. Box 41635-1314, Rasht,
Iran.
*Corresponding
author. E-mail:
saboriho@yahoo.com
and
hos.sabouri@gmail.com. Postal code: 4971799151. Tel:
(+98)9111438917. Fax: (+98)1722224060.
Accepted 5 September, 2008 |
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An F2:3 population derived from the cross between
Tarommahalli (indica) and Khazar (indica) was
used to mapping salt tolerance in rice. The linkage map
constructed by 74 simple sequence repeat (SSR) molecular
markers covered a total of about 1231.50 cM rice genome.
Plant stand, chlorophyll content, root and shoot length,
fresh weight of root and shoot, dry weight of root and
shoot, Na+ uptake, K+ uptake, Na+/K+
ratio related to uptake ions and green leaf area were
mapped. Four QTLs for root length under salt stress were
detected on chromosomes 1, 4, 7 and 9. Also, two QTLs (on
chromosome 9) for dry weight root and three QTLs for ion
exchanges (on chromosome 3 and 10) were identified.
Tarommahalli alleles in these loci increased salt tolerance.
Of these QTLs, the five major QTLs with the very large
effect, qRL-7 for root length, qDWRO-9a and qDWRO-9b for dry
weight root, qBI-1a and qBI-1b for biomass explained 16.21,
27.43, 25.50, 22.24 and 26.83% of the total phenotypic
variance, respectively. All these results reinforced the
idea that, new QTLs of this study play an important role in
the growth of rice at seedling in Iranian local population
under salinity condition.
Key words: Composite interval mapping,
ion
exchange, molecular markers, salt tolerance, simple sequence
repeat. |
