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- Title
Genotype and phenotype associations with drought tolerance in barley tested in North Africa.
- Authors
Forster, B. P.; Ellis, R. P.; Moir, J.; Talamè, V.; Sanguineti, M. C.; Tuberosa, R.; This, D.; Teulat-Merah, B.; Ahmed, I.; Mariy, S. A. E. E.; Bahri, H.; El Ouahabi, M.; Zoumarou-Wallis, N.; El-Fellah, M.; Salem, M. Ben
- Abstract
A review is presented of genetic strategies deployed in a 3-yr project on drought tolerance in barley. Data were collected on genetic, physiological and agronomic traits in non-irrigated and irrigated field trials in Egypt, Morocco and Tunisia. A wide range of barley germplasm (developed from African and European cultivars, adapted landraces and wild barleys) was tested, and positive traits were found in each gene pool. The contrasting environments of the three North African countries had major effects on plant/genotype performance. Genetic effects were also detected, as were genotype x environment interactions. A range of strategies were deployed to investigate the physiology and genetics of quantitative traits associated with field performance. Quantitative trait locus (QTL) analysis was performed using backcross lines, recombinant inbred lines and doubled haploid mapping populations. A detailed genetic map was generated in the Tadmor x (ER/Apm) recombinant inbred lines, an important mapping population specifically developed by ICARDA (Centre for Agricultural Research in Dry Areas) and CIMMYT (International Maize and Wheat Improvement Center) to study drought. Quantitative trait loci (QTLs) for grain yield and other important morphological and physiological traits were also identified in a population of doubled haploids derived from F2BC1 plants from a cross between a cultivar and a wild barley accession. Significantly, the wild parental line was found to contribute a number of positive alleles for yield. Effects of major developmental genes could explain many of the responses observed. QTLs were found to cluster around major genes controlling flowering time (sgh1), plant stature (sdw1 and arie.GP) and ear type (vrs1 ), and it is highly likely that the associations represent pleiotropic effects. Some QTLs were associated with candidate genes such as dehydrins and rubisco activase. One of the most significant results was the identification...
- Subjects
DROUGHT-tolerant plants; BARLEY; PLANT germplasm; HAPLOIDY; FLOWERING time
- Publication
Annals of Applied Biology, 2004, Vol 144, Issue 2, p157
- ISSN
0003-4746
- Publication type
Article
- DOI
10.1111/j.1744-7348.2004.tb00329.x