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American Journal of Plant Physiology
  Year: 2018 | Volume: 13 | Issue: 1 | Page No.: 1-7
DOI: 10.3923/ajpp.2018.1.7
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Carbon Isotope Discrimination as Physiological Marker to Select Tolerant Wheat Genotypes (Triticum aestivum L.) Under Water Limited Conditions

H. Bachiri , R. Djebbar, A. Mekliche , C. Djenadi and A.M.A. Ghanim

Background and Objective: Wheat crop always considered as strategic crop in Algeria and most Algerian land used for wheat production is subjected to water stress. Improvement of drought tolerance in wheat is among objectives for breeder in this region. This experiment was aimed to use carbon isotope discrimination (CID or Δ) as physiological marker to compare the response of ten wheat genotypes (Triticum aestivum L.) under different water regimes and to evaluate the relationship between Δ and other traits. Materials and Methods: Ten bread wheat genotypes were grown in pots in the absence of stress until 3 weeks of germination, 3 treatments of water regimes were imposed progressively. Treatments resulted from the combination of three irrigation levels (well-watered at 100%, medium-watered at 50% and low-watered at 25% of container capacity). Water stress was imposed after three weeks of germination, the experiment was continued up to 8th week of germination. The data were recorded in terms of dry matter (DM), relative water content (RWC) and carbon isotope ratio (δ) analyzed from shoot dry matter. Results: Carbon isotope discrimination varied significantly (p<0.01) among genotypes under well-watered and water-stressed conditions (medium-watered and low-watered treatments). Water regimes produced a linear and significant (r = 0.99, p<0.001) decrease in Δ with DM of all genotypes, the correlation between Δ and dry matter (DM) was positive (r = 0.71, p<0.05) in case of medium-watered treatment, while Δ wasn’t correlated with DM for well-watered and low-watered treatments. The genotypes V9, Hidhab and V6 exhibited the best performance under water stress (medium-watered treatment), with minimum decrease in DM and high carbon isotope discrimination (CID) values were observed in these genotypes as well as close relationship between DM and Δ. Conclusion: Data indicated that measurement of carbon isotope discrimination maybe useful tool for selection of drought tolerant wheat genotypes to enhance wheat productivity in drought prone areas.
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  •    Gamma Irradiation Effects on Some Physiological Traits of Wheat (Triticum aestivum L.) under Control and Water Stress Conditions
How to cite this article:

H. Bachiri, R. Djebbar, A. Mekliche, C. Djenadi and A.M.A. Ghanim, 2018. Carbon Isotope Discrimination as Physiological Marker to Select Tolerant Wheat Genotypes (Triticum aestivum L.) Under Water Limited Conditions. American Journal of Plant Physiology, 13: 1-7.

DOI: 10.3923/ajpp.2018.1.7






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