Salt Tolerance in the Triticeae: The Contribution of the D Genome to Cation Selectivity in Hexaploid Wheat

Shah, Swati; Gorham, J.; Forster, B. P.; Jones, R. G. Wyn

doi:10.1093/jxb/38.2.254

Cited by 118 publications

(66 citation statements)

References 32 publications

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“…Salt tolerance in the Tritiaceae is associated with sodium exclusion (Shah et al 1987;Gorham et al 1990;Husain et al 2003). Bread wheat (hexaploid) cultivars have very low rates of Na + transport to the shoot, and maintain a high K + / Na + ratio in leaves (Shah et al 1987;Gorham et al 1987).…”

Section: Introductionmentioning

confidence: 99%

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A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

Lindsay

Lagudah

Hare

et al. 2004

Functional Plant Biol.

200

122

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Abstract. Salinity affects durum wheat [Triticum turgidum L. ssp. durum (Desf.)] more than it affects bread wheat (Triticum aestivum L.), and results in lower yield for durum wheat cultivars grown on salt-affected soils. A novel source of salt tolerance in the form of a sodium exclusion trait, identified previously in a screen of tetraploid wheat germplasm, was mapped using a QTL approach. The trait, measured as low Na + concentration in the leaf blade, was mapped on a population derived from a cross between the low Na + landrace and the cultivar Tamaroi. The use of AFLP, RFLP and microsatellite markers identified a locus, named Nax1 (Na exclusion), on chromosome 2AL, which accounted for approximately 38% of the phenotypic variation in the mapping population. Markers linked to the Nax1 locus also associated closely with low Na + progeny in a genetically unrelated population. A microsatellite marker closely linked to the Nax1 locus was validated in genetically diverse backgrounds, and proven to be useful for marker-assisted selection in a durum wheat breeding program.

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Section: Introductionmentioning

confidence: 99%

“…Bread wheat (hexaploid) cultivars have very low rates of Na + transport to the shoot, and maintain a high K + / Na + ratio in leaves (Shah et al 1987;Gorham et al 1987). This 'enhanced K + / Na + discrimination' trait confers salt tolerance (Dvořák et al 1994).…”

Section: Introductionmentioning

confidence: 99%

A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

Lindsay

Lagudah

Hare

et al. 2004

Functional Plant Biol.

200

122

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“…In experiments on the ancestors of modern wheat species, differences in K"^ and Na"^ accumulation at low (< 100 mol m^^ NaCl) salinities in hydroponic (water) culture were observed in shoots of the different wheat and Aegilops species (Wyn Jones, Gorham & McDonnell, 1984;Shah et aL, 1987). Greater discrimination (in favour of K"^ and against * To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis and physiology of a trait for enhanced K⁺/Na⁺ discrimination in wheat

et al. 1997

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SUMMARYVariation for K" and Na^ accumulation at low salinities in hydroponic (water) culture were observed in shoots of different wheat species. Greater discrimination (in favour of K+ and against Na+ accumulation) was shown by hexaploid bread wheat {Triticum aestivum L.) than by tetraploid durum wheat (T. turgidum L.). Since Aegilops tauschii Cosson {A. squarrosa L.), the source of the D genome in bread wheat, also exhibited high discrimination between K"^ and Na^, it was concluded that the character resided in the D genome. Studies of aneuploid bread wheat lines and disomic substitution lines of D genome chromosomes for their A and B genome homoeologues in durum wheat cv. Langdon revealed that the trait was controlled by the long arm of chromosome 4D. Since the aneuploid and disomic substitution lines showed better relative salt tolerance than durum wheat, but had lower yield potentials, we recombined chromosome 4D with chromosome 4B in a tetraploid wheat background using a homoeologous pairing mutant. This produced families of 4D/4B recombinant lines, some of which exhibited the enhanced K'^/Na'^ discrimination trait. RFLP analysis confirmed that the trait was controlled by a single gene (Knal) which was completely linked to five markers on the distal third of the long arm of 4D. A second cycle of homoeologous recombination was employed to remove the distal 4D genetic material from the recombined Knal 4B/4D chromosome and to map Kfial in greater detail. By this strategy, Knal was mapped within a short 2 cM region. Genetic analysis of K"^: Na"^ ratios showed very high LOD scores in this region for plants grown in solution culture, but lower values for plants grown in the field.In general, recombinant lines which exhibited the enhanced K+/Na+ trait were slightly more tolerant of salinity in the field and in sand culture than recombinants lacking the trait. There was, however, considerable variation between individual lines. Ion discrimination and relative tolerance were also higher in a Knal recombinant (line no. R3) than in a knal recombinant (line no. R165) in sodic conditions. In these two lines the enhanced K+/Na+ discrimination trait did not alter responses to low potassium or calcium supply.

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“…Salt tolerance in wheat is mostly related to its enhanced ability to discriminate between K and Na during transport of these ions to the shoot (Gorham et al 1990). It has been reported that 346 Singh and SengaR: Indian Bread Wheat Genotypes under Salinity Cereal Research Communications 44, 2016 in wheat (hexaploid), the 4D chromosome, derived from the wild grass is responsible for salt tolerance and K + /Na + discrimination character (Shah et al 1987). The K + /Na + ratio has been used as an index for sodium toxicity in plant tissues, because it is assumed that activity of K + requires some enzymes (Cramer et al 1994), and higher K + /Na + ratio indicates less Na + toxicity.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Selected Indian Bread Wheat (Triticum aestivumL.) Genotypes for Morpho-physiological and Biochemical Characterization under Salt Stress Conditions

Singh¹,

Sengar²

2016

Cereal Research Communications

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Wheat is the second most important crop after rice in India and occupies approximately 28.5 million hectare area. Salinity is one of the major factors reducing plant growth and productivity worldwide, and affects about 7% of world's total land area. In India about 6.73 million hectare land area is salt affected. The aim of this study was to investigate the morpho-physiological and biochemical response of wheat to temporal salinity (EC iw = 10.0 dSm -1 ) exposures. Ten wheat genotypes were evaluated in two successive growing seasons (2012)(2013)(2014), with complete randomized design with three replications under both salinity stress and non-stress conditions. The morpho-physiological and biochemical character measured in this investigation, inhibited under both salt stresses (S1 & S2) conditions but much more significantly inhibited under long-term salinity exposure (S2) than S1 because interrupting the metabolic process of plant, resulting in reduced growth and productivity. According to correlation result, selection of high yield genotypes can be done based on plant height (0.649*), tiller plant -1 (0.808**) and leaf area (0.687*). The multivariate morphophysiological and biochemical parameters should be further used to develop salinity tolerance in wheat breeding improvement programmes.

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Salt Tolerance in the Triticeae: The Contribution of the D Genome to Cation Selectivity in Hexaploid Wheat

Cited by 118 publications

References 32 publications

A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

Genetic analysis and physiology of a trait for enhanced K⁺/Na⁺ discrimination in wheat

Evaluation of Selected Indian Bread Wheat (Triticum aestivumL.) Genotypes for Morpho-physiological and Biochemical Characterization under Salt Stress Conditions

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Salt Tolerance in the Triticeae: The Contribution of the D Genome to Cation Selectivity in Hexaploid Wheat

Cited by 118 publications

References 32 publications

A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

A locus for sodium exclusion (Nax1), a trait for salt tolerance, mapped in durum wheat

Genetic analysis and physiology of a trait for enhanced K+/Na+ discrimination in wheat

Evaluation of Selected Indian Bread Wheat (Triticum aestivumL.) Genotypes for Morpho-physiological and Biochemical Characterization under Salt Stress Conditions

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Genetic analysis and physiology of a trait for enhanced K⁺/Na⁺ discrimination in wheat