Czech J. Genet. Plant Breed., 2012, 48(4):178-184 | DOI: 10.17221/21/2012-CJGPB

Assessment of drought tolerance of some Triticum L. species through physiological indicesOriginal Paper

Muhammad Abdul Rab Faisal SULTAN1,2, Liu HUI1,2, Lv Jin YANG1,2, Zhao Hui XIAN1,2
1 State Key Laboratory of Crop Stress Biology for Arid Areas,
2 College of Life Sciences, Northwest A & F University, Shaanxi, Yangling, China

Wheat is one of the most important crops in the world. Its yield is greatly influenced by global climate change and scarcity of water in the arid and semi-arid areas of the world. So, exploration of gene resources is of importance to wheat breeding in order to improve the crop ability of coping with abiotic stress environment. Wild relatives of wheat are rich repositories of beneficial genes that confer tolerance or resistance not only to drought but also to other environmental stresses. In the present study, the changes in leaf relative water content (RWC), free proline content, and malondialdehyde (MDA) accumulation of five wild wheat species including T. boeticum (YS-1L), T. dicoccum var. dicoccoides (YS-2L), T. araraticum (ALLT), and two cultivated varieties of T. turgidum ssp. durum (MXLK and 87341), with two well-known common wheat cultivars (SH6 and ZY1) possessing strong drought resistance and sensitiveness, respectively, as references were investigated during 3-day water stress and 2-day recovery, in order to assess the drought tolerance of these wild wheat species. 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 compared to the other wheat species. From the data it was obvious that YS-1L was the most drought tolerant among studied species having significantly higher proline and RWC while lower MDA content under water stress conditions. The order of water stress tolerance of these species according to the three parameters is: YS-1L > YS-2L > SH6 > 87341 > ZY1 > MXLK > 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.

Keywords: drought tolerance; MDA; proline; relative water content; Triticum L. species; water stress

Published: December 31, 2012  Show citation

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SULTAN MARF, HUI L, YANG LJ, XIAN ZH. Assessment of drought tolerance of some Triticum L. species through physiological indices. Czech J. Genet. Plant Breed.. 2012;48(4):178-184. doi: 10.17221/21/2012-CJGPB.
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