Hanen Sbei

... G. Zhou 4 PR Ryan 4 E. Delhaize CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia 123 Mol Breeding DOI 10.1007/s11032-011-9559-9 Page 2. ... 2005; Lee et al. 2006; Ma et al. 2007; Chen et al. 2008a; Moham-madi-Nejad et al. 2008; Yang et al. 2009). ...

Salinity is one of the major constraints on world barley production. Exploitation of natural variation of salinity tolerance in existing germplasm and the development of tolerant cultivars are potentially effective approaches for minimizing yield losses. In this study, seedlings of 146 accessions were assessed in a hydroponic system. The experiment was arranged in a completely randomized design with the treatment of 0 and 22 ms/cm2 NaCl, three replications and four plants in each accession per replication. After 17 days of treatment, salinity tolerance index (STI) was calculated for the traits: number of leaves (NL), shoot length (SL), root length (RL), shoot dry weight (SDW), root dry weight (RDW) and plant dry weight (PDW). There was a wide variation in salinity tolerance among the barley accessions. All traits were affected by salinity. SDW was highly affected by salinity and correlated with the NL, RDW and PDW, with the correlation coefficients of 0.43, 0.84 and 0.99, respective...

Barley (Hordeumvulgare L.) is an important food and fodder cereal crop in Tunisia. While it’s highly affected by abiotic stress such us salinity. The latter restricts the use of agricultural land and limits the yield of barley. The development of salinity-tolerant crops is an important management option for maintaining production in salinity-deposited soils. 77 Doubled Haploid lines (DHs) produced from the cross between local accession 1a and Rihane were tested to evaluate the genetic variation and to identify salinity tolerant DHs in two contrasting environments; rain fed and irrigated with high water salinity (8.06 ms/cm). The trial was conducted in an augmented design model with six blocks and five modern cultivars as checks. The phenotypic evaluation was performed at anthesis and maturity stages. The agronomic traits performed at anthesis stage are: height (HA), leaf Area (LA), growth stage (GS) and dry matter of plants (DM). Number of spike (SN), thousand kernel weight (TKW), p...

Salinity is one of the major constraints limiting the yield of barley (Hordeum vulgare L.) in Tunisia especially local barley.
During 2010, a total of one hundred and twenty accessions collected from four regions were evaluated in a field conditions in two
contrasting environments; rain fed and irrigated with high water salinity respectively using an augmented design model. In rain fed
conditions, PCA discriminate the local barley according to their end use; Souihli and Arbi landraces as fodder barley and Ardhaoui
landraces as food and feed. In salinity conditions, Ardhaoui population originally collected from low altitude (Zarzis, Medenine and
Ben Guerden) is a salt tolerant landrace and display differential mechanisms for salt tolerance. Zarzis and Medenine landraces
displayed a high biomass and high seed number suggesting that tolerance is due to an efficient seed translocation. The Ben Guerden
landrace displayed a high harvest index and early flowering date suggesting that the tolerance is due to maintenance of low floral
abortion. These results are prerequisite for developing tolerant varieties by crossing the best accessions possessing a good biomass
and high fertility with accessionsshowing a high harvest index.

Salinity is one of the major constraints on world barley production. Exploitation of natural variation of salinity tolerance
in existing germplasm and the development of tolerant cultivars are potentially effective approaches for minimizing yield losses. In this study, seedlings of 146 accessions were assessed in a hydroponic system. The experiment was arranged in a completely randomized design with the treatment of 0 and 22 ms/cm2 NaCl, three replications and four plants in each accession per replication. After 17 days of treatment, salinity tolerance index (STI) was calculated for the traits: number of leaves (NL), shoot length (SL), root length (RL), shoot dry weight (SDW), root dry weight (RDW) and plant dry weight (PDW). There was a wide variation in salinity tolerance among the barley accessions. All traits were affected by salinity. SDW was highly affected by salinity and correlated with the NL, RDW and PDW, with the correlation coefficients of 0.43, 0.84 and 0.99, espectively. Based on a multivariate analysis, 19 tolerant and 14 susceptible accessions were identified.