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Journal of Applied Sciences
Year: 2019  |  Volume: 19  |  Issue: 1  |  Page No.: 48 - 55

Effect of Soil Texture on Stachys multicaulis Benth's Root System Architecture under Drought and Salinity Stress

Ali Tavili, Habib Yazdanshenas, Mohammad Jafari, Hossein Azarnivand and Hossein Arzani    

Abstract: Background and Objective: Changing the plant's architecture root system in the face of environmental stress is one of the most important mechanisms for adaptation of plants and drought stress and salinity are the most important factors that plants should be resistant against them in term of root morphophysiological changes. Therefore, the aim of this research was an assessment of the root morpho-physiological change of the Iranian medicinal endemic Stachys multicaulis under environmental stress. Materials and Methods: Drought treatments included 3 day intervals irrigation periods and a set of salinity (0, 5 and 25 ds m1) were used at a completely randomized design in three different soil textures in pots. Morphological changes of plant's root under stress in three soil texture were studied over the time. Results: Drought and salinity had a distinguish effect on plant root properties based on soil texture. Root length and volume increased along with the increasing the severity of drought in three light, medium and heavy soil textures. But root length and volume decreased along with the increasing the severity of salinity (p<0.05). The plant's root length was 24, 10 and 17 cm, respectively for drought, salinity and control sample in heavy soil. Both salinity and drought stress, also had a positive effect on root density (r2 = 0.56, 0.30 and 0.68 for light, medium and heavy soil textures, respectively under salinity stress). Conclusion: This study indicated that morpho-physiological changes of the S. multicaulis's root under salinity and drought stress is closely dependent on physical properties of the soil.

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