Drought-Tolerance QTLs Associated with Grain Yield and Related Traits in Spring Bread Wheat

Published Date
April 04, 2022
Type
Journal Article
Drought-Tolerance QTLs Associated with Grain Yield and Related Traits in Spring Bread Wheat
Authors:
Sahar Bennani
Ahmed Birouk, Mohammed Jlibene, Miguel Sanchez-Garcia, Nasserlehaq Nsarellah, Fatima Gaboun, Wuletaw Tadesse

The present research aims to identify the efficient combination of drought-tolerance selection
criteria and associated quantitative trait loci. A panel of 197 bread wheat genotypes was
evaluated for yield- and drought-tolerance-related traits in two environments (favorable and semiarid)
for 2 years (2015–2016). Grain number, biomass, number of fertile spikes per plant and ground
cover exhibited a significant correlation with grain yield and constitute potential secondary selection
criteria for yield under drought conditions. About 73 significant marker–trait associations were
detected along various chromosomal positions. The markers “wsnp_Ex_Rep_c67786_66472676” and
“ExcalibuR_c24593_1217” exhibited important genetic gains associated with yield increase under
drought (11 and 7%, respectively). The markers “KukRi_c94792_127” and “wsnp_Ex_c298_580660”
showed a significant correlation with grain yield, biomass and grain number and were associated
with a significant increase in yield performance at the semiarid site (+6 and +7%, respectively).
The ground cover was found associated with grain yield and biomass through the markers
“wsnp_Ex_Rep_c67786_66472676” (+11%) and “KukRi_c49927_151” (+10%). One marker “Tdu-
RuM_contig25432_1377” on chromosome 5B at 20 cM was consistently correlated with the number
of fertile spikes across both environments. Further research should be considered to validate the
efficiency of these markers to

Citation:
Sahar Bennani, Ahmed Birouk, Mohammed Jlibene, Miguel Sanchez-Garcia, Nasserlehaq Nsarellah, Fatima Gaboun, Wuletaw Tadesse. (4/4/2022). Drought-Tolerance QTLs Associated with Grain Yield and Related Traits in Spring Bread Wheat. Plants, 11 (7).
Keywords:
gwas
triticum aestivum l
drought tolerance
selection criteria
quantitative trait loci