Reference "QTLs for Na+ and K+ uptake of the shoots and roots controlling rice salt tolerance"

Reference ID

8178

Title

QTLs for Na+ and K+ uptake of the shoots and roots controlling rice salt tolerance

Source

Theoretical and applied genetics, 2004, vol. 108, pp. 253-260

Authors (9)

Lin-H-X	Zhu-M-Z
Yano-M	Gao-J-P
Liang-Z-W	Su-W-A
Hu-X-H	Ren-Z-H
Chao-D-Y

Abstract

An F2 and an equivalent F3 population derived from a cross between a high salt-
tolerance indica variety, Nona Bokra, and a susceptible elite japonica variety,
Koshihikari, were produced. We performed QTL mapping for physiological traits
related to rice salt-tolerance. Three QTLs for survival days of seedlings (SDSs)
under salt stress were detected on chromosomes 1, 6 and 7, respectively, and
explained 13.9% to 18.0% of the total phenotypic variance. Based on the
correlations between SDSs and other physiological traits, it was considered that
damage of leaves was attributed to accumulation of Na+ in the shoot by transport
of Na+ from the root to the shoot in external high concentration. We found eight
QTLs including three for three traits of the shoots, and five for four traits of
the roots at five chromosomal regions, controlled complex physiological traits
related to rice salt-tolerance under salt stress. Of these QTLs, the two major
QTLs with the very large effect, qSNC-7 for shoot Na+ concentration and qSKC-1
for shoot K+ concentration, explained 48.5% and 40.1% of the total phenotypic
variance, respectively. The QTLs detected between the shoots and the roots
almost did not share the same map locations, suggesting that the genes
controlling the transport of Na+ and K+ between the shoots and the roots may be
different.