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The Effects of Metabolism in Response to Water Stress of Three Poa Species under Germinator and Greenhouse Conditions
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Volume 2, 2014
Issue 2 (April)
Pages: 22-28   |   Vol. 2, No. 2, April 2014   |   Follow on         
Paper in PDF Downloads: 36   Since Aug. 28, 2015 Views: 2613   Since Aug. 28, 2015
Mojtaba Akhavan Armaki , Young Researchers and Elite club, Kashan Branch, Islamic Azad University, Kashan, Iran.
In order to determine the reaction of three Poa species to drought stress, two separate experiment were conducted in both germinator and greenhouse conditions using factorial experiment based of completely randomized design with three replications in 2010 in Tehran, Iran. The drought treatments were four levels of osmotic potential (0, -0.3, -0.6 and -0.9 MPa) in germinator and four levels of osmotic potential (FC, 25% FC, 50% FC and 75% FC) in greenhouse that were made by poly ethylene glycol (PEG 6000) solution and field capacity method, respectively. Data were collected and analyzed for germination percent, root length, shoot length, seedling length, root/shoot length ratio (RSR), seedling weight, seedling dry/fresh weight ratio (DFR) and seed vigor index. In greenhouse, chlorophyll, carbohydrates and proline contents were also measured. The results showed significant differences among species, droughts levels and species by drought interaction effects for the most of traits in both conditions. However, the relationship between germinator and greenhouse, quantified using correlation was high. It was concluded that evaluation under germinator conditions is desirable for selection purposes. In both conditions all of seedling traits except RSR, DFR were increased and proline and carbohydrate content were increased by increasing osmotic potential. The results showed that the P.bulbosa species had higher values for the most of seedling attributes than other species. Results of probit analysis of LD50 and LD90 showed the same trend.
Drought, PEG6000.Germination, Seed Vigor, Poa
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