https://doi.org/10.4081/ija.2022.1942

Durum wheat salt stress tolerance is modulated by the interaction between plant genotypes, soil microbial biomass, and enzyme activity

Vol. 17 No. 1 (2022)
Submitted: 8 July 2021
Accepted: 5 January 2022
Published: 21 January 2022
Durum wheat, enzymatic activities, growth stages, microbial biomass, salinity, yield.
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Authors

  • Khaoula Boudabbous • khaoulaboudabbous15@gmail.com Genetics and Cereal Breeding Laboratory (LR14AGR01); and Horticultural Sciences Laboratory (LR13AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Imen Bouhaouel Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Nadhira Benaissa Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Maroua Jerbi Horticultural Sciences Laboratory (LR13AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Youssef Trifa Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Ali Sahli Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Chahine Karmous Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.
  • Hajer S. Amara Genetics and Cereal Breeding Laboratory (LR14AGR01), National Agronomic Institute of Tunisia, University of Carthage, Tunis-Mahragene, Tunisia.

Understanding the relationship between durum wheat genotypes and soil biochemistry under salt stress plays a key role in breeding for yield superior genotypes. Thus, microbial biomass carbon (MBC) and nitrogen (MBN), the activity of three selected enzymes including dehydrogenase (D-ase), alkaline phosphatase (Alk-ase), and protease (P-ase), and available phosphorus (available P) and nitrogen (available N) were assessed. Two landraces and two improved varieties were tested under two salinity levels of water irrigation (0.3 and 12 dS m–1). Soil sampling was carried out at five durum wheat growth stages. The soil biota-genotype interaction seems to affect the biological (MBC, MBN, and enzymatic activities) and chemical (available P and N) traits. The microbial activity of rhizospheric soil was higher at the tillering and flowering stages. Under saline conditions, ‘Maali’ (improved variety) and ‘Agili Glabre’ (landrace) showed the best belowground inputs (e.g., MBC, MBN, enzymatic activities, available P and N) and grain yield (GY) performance. Under the same conditions, four soil biochemical indicators of GY of tolerant genotypes (i.e., ‘Maali’ and ‘Agili Glabre’) were determined as available N, P-ase, available P, Alkase, and D-ase. Stepwise analysis revealed that predictive variables depended on growth stages. Overall, MBC, available N, Alk-ase, and P-ase were the variables that mainly contributed to predicting GY in saline environments. In conclusion, the results suggested a specific interaction between plant genotype roots and soil microbes to overcome salt stress. Thus, soil biological components should acquire more importance in plant salinity tolerance studies.

Highlights
- Salt-tolerant durum wheat genotypes showed greater microbial activities in the rhizosphere.
- Microbial enzymatic changes depended on the interaction plant genotype x soil salinity.
- The MBC/MBN ratio and dehydrogenase strongly correlated with grain yield under salinity.
- MBC, available N, and alkaline phosphatase as predictors of grain yield at 12 dS m–1.
- Tillering and flowering could be key stages of durum wheat salinity tolerance.

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How to Cite

Boudabbous, K., Bouhaouel , I., Benaissa, N. . ., Jerbi, M., Trifa, Y. ., Sahli, A. ., Karmous, C. ., & Amara, H. S. (2022). Durum wheat salt stress tolerance is modulated by the interaction between plant genotypes, soil microbial biomass, and enzyme activity. Italian Journal of Agronomy, 17(1). https://doi.org/10.4081/ija.2022.1942
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