Zahra Khazaei; Mohammad Sayyary; Mehdi Seydi
Abstract
Drought, withnegative impacts on plant growth and development, isa major abiotic stress. In order to decreasing drought stress injuries and recognizing red peppers tolerance physiology against drought stress in greenhouse conditions, an experiment with three levels of drought stress (irrigation at 100, ...
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Drought, withnegative impacts on plant growth and development, isa major abiotic stress. In order to decreasing drought stress injuries and recognizing red peppers tolerance physiology against drought stress in greenhouse conditions, an experiment with three levels of drought stress (irrigation at 100, 60 and 30% of field capacity) and four concentrations of 5-aminolevolinic acid ((ALA; 0, 0.25, 0.5, and 1 mM)with four replications in an experimental was 3×4 factorial experiments in a randomized completely design was conducted in greenhouse of Agricultural Faculty of Ilam University. In the end of experiments, parameters such as ascorbate peroxidase activity, total antioxidant activity, malondialdehyde content, ascorbic acid, relative water content, plant height and number of lateral buds was evaluated. The results showed that with increasing drought stress severity the growth parameters decreased significantly but ascorbate peroxidase activities, total antioxidant capacity, malondialdehyde and ascorbic acid content increased. Foliar application of AHA reduced malondialdehyde content and improved other evaluated traits. ALA protected cell membranes by reducing malondialdehyde content and lipid peroxidation. In addition, ALA with increasing ascorbate peroxidase activity, total antioxidant capacity and ascorbic acid contents in plants improved physiological traits and drought stress resistance.
Reza Sharifiasl; Abdolali Shojaeiyan; Mehdi Seyedi; Alireza Giti
Abstract
In order to study the effects of reducivs irrigation water alkalinity and acidity on quality and quantify of geranium growth in pot with soil mixteur medium , the research work was carried out during 2007-2008 in a green house ,using a factorial assay and a randomized complete block design with three ...
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In order to study the effects of reducivs irrigation water alkalinity and acidity on quality and quantify of geranium growth in pot with soil mixteur medium , the research work was carried out during 2007-2008 in a green house ,using a factorial assay and a randomized complete block design with three replication. The main plot assigned to cultivar (white and red colored flower geranium) and the subplot assigned to irrigation water acidity viz, pH1=4, pH2= 4/5, pH3=5, pH4=5/5, pH5=6 and pH6(well water)=7/8.Results showed that irrigation water acidification significantly increased number of total flowers and opened flowers per inflorescence ,chlorophil and magnesium content of leaves. But its effects on petiole length was not significant. Cultivar and water acidification interactions had highly significant impacts on stem length, leaf size, fresh and dry weight of plant foliages , number of inflorescence per plant and Iron content and significant impacts on inflorescence diameter and number of lateral branches at five percent of probability. Comparison of means and neutralizing alkalinity and acidifying of irrigation water to PH=5/5 con increase nutrients absorbsion and improve quantitative and qualitative traits of geranium
