Evaluation of water deficit stress on morphological characters someand selection of tolerance - genotypes in alfalfa (Medicago sativa L.) cultivars.
2007
Afsharmanesh, Gholam Reza
Drought stress is one of the most important environmental factors in reducing growth, development and production of plants. Suitable germination and drought tolerance of alfalfa by selection of drought tolerant genotypes is very important. In order to select tolerate alfalfa cultivars, a field experiment was conducted during 2005 _ 2006 in Agriculture Research centre of Jiroft and Kahnouj to determine the effect of water stress on morphological characters of alfalfa cultivars wit using a split plot design based on Randomized Complete Block Design (RCBD) with three replications. The three levels of water stress (A1 = severely stressed, A2 = moderately stressed and A3 = least stressed) were main plot factor and five cultivars of alfalfa (B1 = Yazdi, B2 = Nikshahri, B3 = Rangar, B4 = Bami and B5 = Baghdadi) were arranged in sub plots. In each cut, total fresh and dry forage weight, number of stem, Leaf Area Index (LAI), number of internode, plant height, leaf stem ratio, leaf number, internode length and protein were measured. The results showed that the effect of water deficit stress on morphological characters specially internode length were significant. By inreasing water stress the fresh and hay forage, plant height, numbers of stem, LAI, internode length and number of node by increasing water stress were decreased. However, leaf stem ratio increased by increasing water stress. A significant positively correlation between hay forage and plant height, stem number, LAI, were observed. The higher hay forage obtained from Nikshahri and Bami alfalfa cultivars in (Lowstressed) Condition Nikshahri and Bami alfalfa cultivars were the most tolerant and Ranger was the most sensitive accision in response to water stress.
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