Abstract
Background
The future predictions for frequent and severe droughts will represent a significant threat to wheat yield and food security. In this context, breeding has proven to be the most efficient approach to enhance wheat productivity in dry environments.
Methods and results
In this study, both agronomic and molecular-based approaches were used to evaluate the response of twenty-eight Tunisian wheat varieties to drought stress. The primary objective was to screen these varieties for drought tolerance using molecular and agro-morphological markers. All varieties were significantly affected by drought stress regarding various traits including total dry matter, straw length, flag leaf area, number of senescent leaves, SPAD value, grain yield and grain number. Furthermore, substantial variability in drought-stress tolerance was observed among wheat genotypes. The cluster analysis and principal component analyses confirmed the existence of genotypic variation in growth and yield impairments induced by drought. The stress susceptibility index (SSI) and tolerance index (TOL) proved to be the most effective indices and were strongly correlated with the varying levels of genotypic tolerance. The genotyping evaluation resulted in the amplification of 101 alleles using highly polymorphic 12 SSR markers, showed an average polymorphism of 74%.
Conclusions
Taken together, the combination of agronomic and molecular approaches revealed that Karim, Td7, D117 and Utique are the most drought-tolerant wheat varieties. These varieties are particularly promising candidates for genetic improvements and can be utilized as potential genitors for future breeding programs in arid and semi-arid regions.
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Data availability
No datasets were generated or analysed during the current study.
Abbreviations
- ATI:
-
abiotic stress tolerance index
- BY:
-
biological yield
- DI:
-
drought resistance index
- FWC:
-
field water capacity
- GDD:
-
growth degree-days
- GMP:
-
geometric mean productivity index
- GN:
-
grain number
- GY:
-
grain yield
- K1STI and K2STI:
-
modified stress tolerance index
- LA:
-
Flag leaf area
- MP:
-
mean productivity
- NSL:
-
Number of senescent leaves
- PCA:
-
principal component analysis
- PIC:
-
polymorphism information content
- RDI:
-
relative drought index
- RGR:
-
relative growth rate
- RTC:
-
relative trait change
- SAHN:
-
Sequential Agglomerative Hierarchical Nesting
- SL:
-
straw length
- SSD:
-
single seed descent
- SSI:
-
stress susceptibility index
- SSPI:
-
stress susceptibility percentage
- SSR:
-
single sequence repeat
- SPAD:
-
Chlorophyll content
- STI:
-
stress tolerance index
- TOL:
-
tolerance index
- TDM:
-
total dry matter
- UPGMA:
-
Unweighted Pair-Group Method with Arithmetic average
- WCA:
-
Ward`s cluster analysis
- YI:
-
yield index
- Yp :
-
yield under normal condition
- Ys :
-
yield under stress condition
- YSI:
-
yield stability index
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Acknowledgements
This study was supported by the University of Science of Tunis (FST), the National Gene Bank of Tunisia (BNG) and the National Research Institute of Rural Engineering Water and Forests (INRGREF) of Tunis. Special thanks are due to the staff of the laboratory of FST and BNG for their technical assistance and support. We are grateful to Madam Christie CHAAR for correcting the English language of the manuscript.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by AG, EB, HA, MFS and FG. The first draft of the manuscript was written by AG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Guizani, A., Babay, E., Askri, H. et al. Screening for drought tolerance and genetic diversity of wheat varieties using agronomic and molecular markers. Mol Biol Rep 51, 432 (2024). https://doi.org/10.1007/s11033-024-09340-9
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DOI: https://doi.org/10.1007/s11033-024-09340-9