Show simple item record

dc.creatorLaila, Zahiden_US
dc.identifier.citationZahid Laila. (27/3/2019). valuation de la performance agronomique et des réponses physiologiques des ressources génétiques de l’orge (Hordeum vulgare) sous conditions de stress thermique.en_US
dc.description.abstractOur study evaluated barley genotypes (Hordeum vulgare L.) of different origins, for their tolerance to heat. The trials were conducted at two contrasting environments: Marchouch (optimal conditions) and Wad Medani (heat stress conditions) during the 2017-2018 season. The genotypes included Moroccan varieties, Australian varieties, genebank accessions selected using the FIGS approach (named Landraces), promising lines of ICARDA and isolated intra-cultivar selection lines which are isolated for their high yield potential. The trials are conducted using the alpha-lattice design with two repetitions. In both environments, physiological characteristics (chlorophyll fluorescence and canopy temperature), phenological (days to heading, days to maturity, grain filling period) and agronomic traits which have a relation with yield and its components (number of spikes / m², number of grains per spike, biological yield and grain yield) were measured. The harvest index and four heat stress tolerance indices were calculated based on grain yield in both environments. In addition, a correlation analysis between all traits was performed. The results of this study highlighted the negative effects of heat stress on growth and development of the studied genotypes. These effects were manifested by a reduction in photosynthetic activity, an increase in canopy temperature, a shortening of the plant growth cycle, with a decrease in yield and its components. The heat stress tolerance is shown for some genotypes in the stressed environment, when compared with the results in the optimal conditions In terms of grain yield, five accessions selected using the FIGS approach recorded high grain yield under heat stress conditions, and the highest yields under heat stress were obtained for the Australian varieties: Keel and Gairdner. The heat tolerance indices, the GM (Geometric Mean) and HTI (Heat Tolerance Index) values showed varieties combining the two traits: high grain yield potential and heat stress tolerance index. These varieties are: Baudin, Capstan, IH4-H4 and IH17. A correlation analysis in both environments showed different degrees of significance between physiological, phenological and agronomic traits.en_US
dc.subjectheat stress toleranceen_US
dc.subjectheat tolerance indicesen_US
dc.titlevaluation de la performance agronomique et des réponses physiologiques des ressources génétiques de l’orge (Hordeum vulgare) sous conditions de stress thermiqueen_US
cg.subject.agrovochordeum vulgareen_US
cg.subject.agrovocheat stressen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerMohammed V University at Agdal**en_US
cg.contributor.crpCGIAR Research Program on Wheat - WHEATen_US
cg.contributor.funderGlobal Crop Diversity Trust - GCDTen_US
cg.contributor.projectProviding long-term funding for ex situ collections of germplasm held by ICARDAen_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionNorthern Africaen_US
dc.identifier.statusOpen accessen_US

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

DSpace software copyright © 2002-2016  DuraSpace
MELSpace content providers and partners accept no liability to any consequence resulting from use of the content or data made available in this repository. Users of this content assume full responsibility for compliance with all relevant national or international regulations and legislation.
Theme by 
Atmire NV