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Showing 3 results for Drought Stress

Saeed Reza Hossinzadeh, Azam Salimi, Ali Ganjeali, Raheleh Ahmadpour,
Volume 1, Issue 1 (9-2015)

In order to evaluate the effects of foliar application of methanol on some physiological characteristics of chickpea under drought stress, an experiment was conducted as a factorial based on completely randomized design with three replications in 2011 at the Research Center of Plant Sciences in Ferdowsi University of Mashhad. The first factor was different levels of methanol including, 0 (control), 20, 25, 30, 35 volumetric percentage (v/v), which were used as foliar applications at three times during growth season of chickpea, with 10 days intervals. Second factor was drought stress condition in two levels 25 and 100 percent of field capacity. Results showed that there was significant difference (P‌AWT IMAGE0.01) between methanol levels concentrations regarding to leaf protein content, proline content, total soluble sugar, H2O2 content, catalase, peroxidase and SOD enzyme activity. Spraying with 30% volume level significantly increasedleaf protein, proline and total soluble sugar content compared to control. Effects of drought and methanol were not significant on antioxidant enzyme activity, leaf protein content, total soluble sugar and H2O2 content but on the proline content was significant (P‌AWT IMAGE0.05).

Nobar Hagihosseinlo, Siavasg Hosseini Sargein, Rashid Jamei,
Volume 1, Issue 2 (3-2016)

The objective of the present investigation was to study the effect of drought stress, UV-B radiation and the combined effects of UV-B and drought stresses on two cultivars of gourd (mashhadi and hamadani) seedling. the gourd plants were grown with diurnal regime of 16h light and 8h dark and temperature of 22/260C (night/day). The relative humidity was 60% and average of photosynthetically active radiation was 150 µmol.m-2.S for 25 days. Then, 25-days-old seedlings were divided in to four groups: the control and three groups subjected to stress conditions: UV-B radiation and drought stress conditions, UV-B radiation and drought stresses combined. Results showed that shoot and root length, shoot and root dry and fresh weight, leaf total area, leaf RWC, chlorophyll a, b and carotenoid contents which were irradiated either with UV-B, drought stress or combined of two stresses have reduced significantly when compared with control. The physiological parameters indicate that with this experiment situation UV-B stress has stronger stress effectors than drought on the growth of seedling of both cultivars. The results suggested that co-stresses of supplementary UV-B radiation and drought synergistically functioned and one of them could alleviate the inhibitory effects of another under the condition of arid and semiarid loessial soils.

Raheleh Ahmadpour, Tahereh Bahrami,
Volume 1, Issue 2 (3-2016)

Organic fertilizers are a source of very useful for improving soil quality and yield of various crops. Vermicompost and derived products such as compost tea as a product of urban waste recycling with proper physicochemical features, can play an effective role in plant growth and development and also in reducing harmful effects of various environmental stresses on plants. In order to evaluate the effects of compost tea on some morphological characteristics of lentil under water deficit stress, a factorial experiment was conducted factorial based on completely randomized design with three replications in 2015 at the Khatam Alanbia University of Behbahan. The first factor was different levels of compost tea including, 0 (control), 25, 50 and 75 volumetric percentage and second factor was water stress in three levels, 25, 50 and 100 field of capacity. Foliar application of compost tea was applied 3 times during plant growth stage (seedling, flowering and podding). Results showed that there was significant difference (p 0.01) between vermicompost levels concentrations regarding to plant height, number of branches, leaf number per pod, root and shoot dry weight, taproot length, root diameter, root volume, root area and number of pod. Foliar application of compost tea, for most traits of shoot compared to the control group increased significantly but in the root characteristics under moderate and severe water stress, there was no significant difference between treatments. Considering that, compost tea contains many of the growth regulators and micro and macro element will be introduced as an appropriate fertilizer to increase morphological parameters.

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مجله فیزیولوژی و بیوشیمی گیاهی ایران Iranian Journal of Plant Physiology and Biochemistry
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