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Genetic Diversity in the Batini Barley Landrace from Oman: II.‎ Response to Salinity Stress

Understanding the diversity for salt tolerance in barley (Hordeum vulgare L.‎) landraces will facilitate their use in genetic improvement.‎ Our objectives were to screen a collection of 2308 accessions in seven subpopulations of the Omani Batini barley landrace under salinity stress, quantify genetic variation in germination and early seedling growth attributes, establish the forage yield-salinity response functions for 10 families within each subpopulation, and select genotypes with high yield potential under salinity.‎ Subpopulations displayed high levels of genetic diversity and differed significantly for seed germina- tion and seedling growth attributes at 0.‎0 and 20.‎0 dS m-1, and at tillering stage for forage yield at 0.‎85, 10.‎0, and 20.‎0 dS m-1.‎ A multivar- iate-based selection criterion for high forage yield at tillering stage under salinity stress, based on simultaneous selection for low temporal variation in germination and high shoot dry weight under 20.‎0 dS m-1, identified highly salt tolerant accessions.‎ Twenty-five out of 70 families representing seven subpopulations were classified as salt tol- erant on the basis of their salinity susceptibility indices at 20.‎0 dS m-1.‎ Accessions with short rachilla or with high root number and root length under salinity stress ranked highest in salt tolerance.‎ Forage yield at 10.‎0 and 20.‎0 dS m-1 can be predicted with high (R۲ = ۰.٦۷, P < ۰.۰۰۰۱) and moderate (R۲ = ۰.۲۳, P < ۰.۰۱) accuracy by forage yield under 0.‎85 dS m-1.‎ On average, forage yield was reduced by 2.‎4 and 7.‎9% per dS m-1 at 10.‎0 and 20.‎0 dS m-1, respectively.‎ Although genetically not improved, the landrace, in general, and subpopulation Batini 4, in particular, contain diversity that remains to be exploited.‎

Authors: 
A.‎ A.‎ Jaradat, M.‎ Shahid, and A.‎ Al-Maskri
Year: 
۲۰۰٤
Publication type: 
Scientific Paper
Publication Source: 
Crop Science Society of America
Volume/Chapter/Issue: 
٤٤
Page Number: 
۹۹۷-۱۰۰۷