Combined Stresses in Plants: Physiological, Molecular, and Biochemical Aspects

5 Tolerance to Combined Stress of Drought and Salinity in Barley 107

Stress

QTL used

QTL donor line/cultivar Line/cultivar developed

Trait improved

References

Drought

AB-QTL

Apex/ISR101–23

BC2F2 population

For various agronomic and malting quality traits

Pillen et

al. (

2003

)

Drought

AB-QTL

Brenda/HS584

BC3-doubled haploid population developed

Improved various agronomic and seed quality traits

Kalladan et

al. (

2013

)

Drought

81 QTLs were used, out of which six (1H-3, 2H-1, 3H-2, 4H-3, 1H-5, 3H-1 and 3H-4) were for grain yield

Hordeum spontaneum

Backcross population

Improved grain yield, and reduced negative impact of drought on grain filling

Baum et

al. (

2003

),

Talame et

al. (

2004

),

Tuberosa and Salvi (

2006

)

Salinity

Identified QTLs were located on chromosomes 2H, 1H, 4H, 6H, and 5H

Steptoe x Morex and Harrington x TR306

Two doubled haploid (DH) populations

Those of QTLs controlling salt tolerance at germination and at the seedling stage

Mano and

Takeda (

1997

)

Salinity

A spring barley collection of 192 genotypes were used to identify QTLs on chromosome 6H and 4H by a 1000 SNP marker set

From a wide geographical range

This study can be used for targeting candidate gene(s) for salt tolerance and uptake/transportation of both Na

+ and Cl

− which

are important factors for salt-tolerance improve-ment of barley

Improved biomass production, chlorophyll content, plant height, tiller number, leaf senescence and shoot Na

+, shoot Cl

− and

shoot, root Na

+/K

+ contents

Long et

al. (

2013

)

Drought and salinity

MQTL were located on chromosomes 2H (drought) and 5H (salinity)

Hordeum vulgare

MWG2262BE37M33-160 and E36M50-81-E38M61-302, could be better for developing makers for salinity and drought stresses tolerance

In this study, 26 genes (some genes with two functions) associated with antioxidation (7), electron/ion transporta-tion (1

1), Ca

+2

ion binding

(3), ATP binding/ATPase activity (7), or phosphoryla-tion (7) were colocated with the five-type MQTL

Li et

al. (

2013

)

QTL

quantitative trait locus,

MQTL

meta-QTL,

AB-QTL

advanced backcross QTL,

SNP

single nucleotide polymorphism

Table 5.1

Enhancing drought and salinity tolerance in barley lines/varieties using marker-assisted selection