Assessment of drought tolerance of some Triticum L. species through physiological indices
2012
Sultan, M.A.R.F., Northwest A and F Univ., Yangling (China). State Key Lab. of Crop Stress Biology for Arid Areas | Hui, L., Northwest A and F Univ., Yangling (China). State Key Lab. of Crop Stress Biology for Arid Areas | Yang, L.J., Northwest A and F Univ., Yangling (China). State Key Lab. of Crop Stress Biology for Arid Areas | Xian, Z.H., Northwest A and F Univ., Yangling (China). State Key Lab. of Crop Stress Biology for Arid Areas
In the present study, the changes in leaf relative water content (RWC), free proline content, and malondialdehyde (MDA) accumulation were investigated in wild wheat species (T. boeticum (YS-1L), T. dicoccum var. dicoccoides (YS-2L) and T. araraticum (ALLT)) and two cultivated varieties of T. turgidum ssp. durum (MXLK and 87341) during 3-day water stress and 2-day recovery in order to assess the drought tolerance of these wheat species. Two well-known common wheat cultivars (SH6 and ZY1) possessing strong drought resistance and sensitiveness, respectively, were used as references. The laboratory experiment was conducted under two water regimes (stress and non-stress treatments). Stress was induced to hydroponically grown two weeks old wheat seedlings with 20% PEG 6000. Stress treatment caused a much smaller decrease in the leaf RWC and rise in MDA content in YS-1L than in the other genotypes studied. It was obvious that YS-1L was the most drought tolerant species having significantly higher proline concentration than the other wheat species. The order of water stress tolerance of the genotypes studied is as follows: YS-1L more than YS-2L more than SH6 more than 87341 more than ZY1 more than MXLK more than ALLT. We speculate that the observed drought stress tolerance at a cellular level was associated with the ability to accumulate proline and high water level conservation.
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