|
Plant Physiol, January 2001, Vol. 125, pp. 406-422
Quantitative Trait Loci for Component Physiological Traits
Determining Salt Tolerance in Rice1
Mikiko L.
Koyama,2
Aurora
Levesley,3
Robert M.D.
Koebner,
Timothy J.
Flowers,* and
Anthony R.
Yeo
Plant Stress Unit, School of Biological Sciences,
University of Sussex, Brighton BN1 9QG, United Kingdom (M.L.K.,
A.L., T.J.F., A.R.Y.); and John Innes Centre, Colney Lane, Norwich NR4
7UH, United Kingdom (R.M.D.K.)
Rice (Oryza sativa) is sensitive to salinity, which
affects one-fifth of irrigated land worldwide. Reducing sodium and
chloride uptake into rice while maintaining potassium uptake are
characteristics that would aid growth under saline conditions. We
describe genetic determinants of the net quantity of ions transported
to the shoot, clearly distinguishing between quantitative trait loci
(QTL) for the quantity of ions in a shoot and for those that affect the concentration of an ion in the shoot. The latter coincide with QTL for
vegetative growth (vigor) and their interpretation is therefore
ambiguous. We distinguished those QTL that are independent of vigor and
thus directly indicate quantitative variation in the underlying
mechanisms of ion uptake. These QTL independently govern sodium uptake,
potassium uptake, and sodium:potassium selectivity. The QTL for sodium
and potassium uptake are on different linkage groups (chromosomes).
This is consistent with the independent inheritance of sodium and
potassium uptake in the mapping population and with the mechanistically
different uptake pathways for sodium and potassium in rice under saline
conditions (apoplastic leakage and membrane transport, respectively).
We report the chromosomal location of ion transport and selectivity
traits that are compatible with agronomic needs and we indicate markers
to assist selection in a breeding program. Based upon knowledge of the
underlying mechanisms of ion uptake in rice, we argue that QTL for
sodium transport are likely to act through the control of root
development, whereas QTL for potassium uptake are likely to act through
the structure or regulation of membrane-sited transport components.
1
This work was supported in the United Kingdom by
the Biotechnology and Biological Sciences Research Council (BBSRC) and
by the Department For International Development. The BBSRC covered the
costs of QTL analysis.
2
Present address: Cereals Research Department,
John Innes Centre, Norwich Research Park, Colney Lane, Norwich, Norfolk
NR4 7UH, UK.
3
Present address: School of Biology, University
of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.
*
Corresponding author; e-mail t.j.flowers{at}sussex.ac.uk; fax
01273-678-433.
© 2001 American Society of Plant Physiologists
This article has been cited by other articles:
|
|
|
|
 
J.R Witcombe, P.A Hollington, C.J Howarth, S Reader, and K.A Steele
Breeding for abiotic stresses for sustainable agriculture
Phil Trans R Soc B,
February 27, 2008;
363(1492):
703 - 716.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
J. Martinez-Atienza, X. Jiang, B. Garciadeblas, I. Mendoza, J.-K. Zhu, J. M. Pardo, and F. J. Quintero
Conservation of the Salt Overly Sensitive Pathway in Rice
Plant Physiology,
February 1, 2007;
143(2):
1001 - 1012.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
F. Brini, M. Hanin, I. Mezghani, G. A. Berkowitz, and K. Masmoudi
Overexpression of wheat Na+/H+ antiporter TNHX1 and H+-pyrophosphatase TVP1 improve salt- and drought-stress tolerance in Arabidopsis thaliana plants
J. Exp. Bot.,
January 17, 2007;
(2007)
erl251v1.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
H. Harada and R. A. Leigh
Genetic mapping of natural variation in potassium concentrations in shoots of Arabidopsis thaliana
J. Exp. Bot.,
March 1, 2006;
57(4):
953 - 960.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
R. Munns, R. A. James, and A. Lauchli
Approaches to increasing the salt tolerance of wheat and other cereals
J. Exp. Bot.,
March 1, 2006;
57(5):
1025 - 1043.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
J. Cuartero, M. C. Bolarin, M. J. Asins, and V. Moreno
Increasing salt tolerance in the tomato
J. Exp. Bot.,
March 1, 2006;
57(5):
1045 - 1058.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
V. Quesada, S. Garcia-Martinez, P. Piqueras, M. R. Ponce, and J. L. Micol
Genetic Architecture of NaCl Tolerance in Arabidopsis
Plant Physiology,
October 1, 2002;
130(2):
951 - 963.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
