Drought and Salinity Impacts on Bread Wheat in a Hydroponic Culture: A Physiological Comparison
Drought and salinity are two major abiotic stresses, similarly and/or differently affecting physiological processes of wheat. The aim of this study was to evaluate and compare the impacts of drought and salinity on wheat. A pot experiment was conducted as completely randomized design with three replications in the research greenhouse of Yasouj University in 2015. Treatments included different levels of salinity and drought with the same osmotic potentials (-2.47, -4.94 and -7.42 bar) and a control. Salinity and drought were imposed with NaCl and PEG 6000 in a Hogland medium, respectively. Results showed that by increasing drought and salinity treatments, relative water cotent and cell membrane stability were decreased but malondialdehyde (MDA) increased. The effect of PEG drought stress on these traits was more than that of NaCl stress. Increasing drought and salinity stresses significantly increased leaf proline, total soluble sugars, and glycinebetaine content, however, this increase was higher for salinity. Fv/Fm was equally affected by salinity and drought, decreasing by both stresses. By raising stress levels, chlorophyll a decreased but chlorophyll b and carotenoid content increased. In general, we found that wheat could tolerate acceptable salinity levels better than drought, by accumulation of osmolytes and more sustained absorption of water and also reducing the MDA production under salinity conditions.
Comparison of Leaf Sheath Transcriptome Profiles with Physiological Traits of Bread Wheat Cultivars under Salinity Stress.
Salinity stress has significant negative effects on plant biomass production and crop yield. Salinity tolerance is controlled by complex systems of gene expression and ion transport. The relationship between specific features of mild salinity stress adaptation and gene expression was analyzed using four commercial varieties of bread wheat (Triticum aestivum) that have different levels of salini...full text
Effect of Recurrent Selection on Drought Tolerance and Related Morpho-Physiological Traits in Bread Wheat
Drought is one of the major abiotic stresses affecting wheat yield. A recurrent selection program was conducted to improve the drought tolerance and yield of bread wheat using drought tolerant advanced breeding lines from a drought tolerant x susceptible cross (HI 1500 x HUW 510). The parental lines were evaluated for yield, biomass and harvest index (HI) in addition to the drought adaptive tra...full text
reinsurance is widely recognized as an important instrument in the capital management of an insurance company as well as its risk management tool. this thesis is intended to determine premium rates for different types of reinsurance policies. also, given the fact that the reinsurance coverage of every company depends upon its reserves, so different types of reserves and the method of their calc...
A proteomic study of the response to salinity and drought stress in an introgression strain of bread wheat.
The effect of drought and salinity stress on the seedlings of the somatic hybrid wheat cv. Shanrong No. 3 (SR3) and its parent bread wheat cv. Jinan 177 (JN177) was investigated using two-dimensional gel electrophoresis and mass spectrometry. Of a set of 93 (root) and 65 (leaf) differentially expressed proteins (DEPs), 34 (root) and six (leaf) DEPs were cultivar-specific. The remaining DEPs wer...full text
Some Physiological Parameters as Screening Tools for Drought Tolerance in Bread Wheat Lines (Triticum aestivam L.)
Two greenhouse experiments were carried out at the Institute of Biological Production Systems, Leibniz Universität Hannover, Germany during 2008/2009 and 2009/2010 growing seasons to study the influence of the osmotic adjustment (OA) capacity, relative water content (RWC) and specific leaf area (SLA) on tolerance to drought in 22 breeding lines, two parents and tolerant cultivar (Sahel 1) of br...full text
assessment of deep word knowledge in elementary and advanced iranian efl learners: a comparison of selective and productive wat tasks
testing plays a vital role in any language teaching program. it allows teachers and stakeholders, including program administrators, parents, admissions officers and prospective employers to be assured that the learners are progressing according to an accepted standard (douglas, 2010). the problems currently facing language testers have both practical and theoretical implications but the first i...
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volume 7 issue 1
pages 61- 74
publication date 2022-05-22
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