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Effect of drought and salt stress on physiological and morphological characteristics of the green covers (Phyla nodiflora L. and Frankenia thymifolia Desf.)
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Sahar Mirzaei *   , Mona Dastoory |
| Ornamental Plants Research Center, Horticultural Sciences Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Mahallat, Iran |
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Abstract: (3543 Views) |
| Iran is one of the countries which have dry lands. Soil dryness is one of the environmental stresses, which, decreases water absorption by roots, also causes problem in plants nutrition and metabolic process. In many cases, due to lack of water or soil moisture, it is not possible to create a landscape with common species. Therefore, the introduction of low-expected plants in the landscape will help to optimize the water useage. Therefor, the research was planed to investigate the morphological and physiological parameters of green covers (Phyla nodiflora L. and Frankenia thymifolia Desf.) under different treatments of irrigation and salt stress to determine their tolerance to drought and salt stress. The experiment was conducted in the form of factorial using completely randomized design, with 12 treatments in 5 replications. Treatments contained 4 salt levels (0.5 ds/m as control, 3, 6 & 9 dSm-1) and 3 irrigation levels (100% as control, 75% & 50% of field capacity). Results indicated that different characteristics, including visual quality, shoots length, leaf area, fresh and dry weights, amount of chlorophyll and photosynthesis, were decreased under water and salt stress. Morphological characteristics of Phyla and Frankenia were similar under different treatments of low irrigation and salt stress. Although visual quality of both green covers was affected under different salt and water stresses, but Phyla was more tolerant compared to Frankenia. Amount of chlorophyll and photosynthesis were decreased with reducing water percentage of field capacity and increasing salt stress. Highest amount of chlorophyll and photosynthesis were in 100% of field capacity and 0.5 dSm-1 of salt stress and lowest amounts were in 50% of field capacity and 9 dSm-1 of salt stress. Results showed that Phyla and Frankenia green covers are not high tolerant to sever drought and salt stress. |
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| Keywords: Drought, Landscape, Salt percentage, Water requirement |
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Full-Text [PDF 674 kb]
(799 Downloads)
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Received: 1970/01/1 | Accepted: 2018/05/5 | Published: 2018/05/7
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