Journal of Plant Process and Function

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This study was performed in order to evaluate the effects of supplementary irrigation and application of Zn and K fertilizers on physiological characteristics of chickpea. The experiment was conducted in a split plot-factorial using randomized complete blocks design with three replications at campus of agriculture and natural resources, Razi University, Kermanshah, Iran. Supplementary irrigation in two levels (W1= non irrigation and W2= supplementary irrigation at podding stage) was considered as main-plot on the other hand, combination treatments of Zn fertilizer in four levels (Zn1=0, Zn2=20, Zn3=40 and Zn4=60kg/ha) and K fertilizer in three levels (K1=0, K2=50 and K3=100kg/ha) were considered as sub-plots. The results showed that the effects of irrigation on all studied physiological characteristics were significant excluding chlorophyll-a and RWL. Likewise, the effect of Zn fertilizer on all parameters was significant. Moreover, the effect of K fertilizer on all parameters was significant excluding chlorophyll SPAD. Based on the results, supplementary irrigation increased the chlorophyll-a, chlorophyll-b, chlorophyll-ab and relative water content (RWC). Under drought stress condition, proline content and storage protein were more than supplementary irrigation treatment. In the same way, application of K fertilizer improved all parameters excluding RWC. Application of 40kg Zn fertilizer improved all parameters in chickpea. In irrigation condition and already application of Zn and K fertilizers as much as optimum amount plant had a good physiological status and produced highest yield, too.

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Water stress is one of the most important abiotic limiting factors that restricts growth, development and productivity of horticulrural crops. In vitro methods have been successfully used for evaluating water deficit stress in plants. In this regards, responses of four Iranian grapevine genotypes to drought stress induced by polyethylene glycol 6000 at -5, -5.24, -5.65, -6.24 and -7 bar were studied in Murashige and Skoog (MS) medium. Results indicated that drought stress reduced shoot fresh weight, leaf area, shoot length and leaf relative water content. Water deficit stress also caused significant increase in proline and malondialdehyde content, and activity of catalase antioxidant enzyme,. It seems that among studied genotypes , ‘Shahani’ with a greater capability to produce proline and antioxidant enzymes was more tolerant to drought stress and ‘Keshmeshi Ghermez Ghazvin’ and ‘Yaghuti Sefid’ genotypes were more susceptible and eventually ‘Asgari’genotype performed semi tolerance to water deficit stress.

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The objective of this research was to study the effects of draught stress and Fe fertilizer on some physiologic and biochemical characteristics in chickpea (Cicer arietinum L.). This study was conducted at Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran, during 2011-12. The experiment laid out as split plot based on RCBD with three replications. Rainfed and without draught stress treatments were as main-plot. The levels Fe Fertilizer were as sub-plot contain eight levels (not-application of Fe Fertilizer (F1), soil-application of Fe Fertilizer (F2), Fe foliar application at branching (F3), Fe foliar application at flowering (F4), Fe foliar application at podding stage (F5), Fe soil application + Fe foliar application at branching (F6), Fe soil application + Fe foliar application at flowering (F7) and Fe soil application + Fe foliar application at podding stage (F8). Results showed that draught stress treatments had significant reduced photochemical capacity photosystem II, crop growth rate, chlorophyll content, leaf area index and Catalase specific activity. Fe fertilizer treatment had significant effect on chlorophyll content, leaf area index, Catalase specific activity and Peroxidase specific activity. Therefore, it seems that Fe foliar application improved the traits related to photosynthesis and reduced the undesirable effects of drought stress on chickpea plants.

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This research was done in order to study the effects of irrigation (I) and nitrogen (N) levels on occurrence time of phenological stages and growth indices of seed corn, SC704 cultivar. The experiment was conducted at Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran, during 2014 and 2015 growing seasons as split-plot based on randomized complete block design with three replications. Main-factor was four I levels including supply 120, 100, 80 and 60% of water requirement. Sub-factor was four levels 140, 100, 70 and 40% of recommended N based on soil analysis. Results showed that tasseling, anthesis and silking stages delayed by reducing of water supply. Increasing of N supply has not significant effect on date of tasseling and anthesis, but silking accelerated. Deficiency of I and N supply led to increasing of anthesis until silking interval. In 120, 100 and 80% of I supply, physiological maturity occurred later by increasing of N. Increasing of N supply, in each I treatment, increased leaf area index and crop growth rate, but the positive effect of N was decreased due to I deficit treatments. Under optimum I conditions, increasing of N supply increased amount and rate of dry matter accumulation, and delayed end of dry matter accumulation.

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An experiment was conducted to study the effect of methyl jasmonate (MJ) on salinity stress alleviation of coriander plantlet. The experiment was set up as factorial experiment in completely randomized design with two factors including NaCl concentration (0, 3 and 6 ds/m) and MJ at three levels (0, 0.25 or 0.5 mM). The results showed that salt stress decreased fresh and dry weight of aerial, concentation of potassium, K/Na ratio, carotenoid, antioxidant capacity and catalase. Parameters such as ion leakage and concentation of aerial sodium increased by salinity stress. Application of MJ decreased ion leakage and sodium of aerial, improved fresh and dry weight of aerial, K/Na ratio, antioxidant capacity and catalase. Improved stress indexes in MJ-treated plantlets showed that applied of MJ ameliorated the adverse effects of injury caused by salt stress.
 

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The purpose of this study was to evaluate how various morphological, phytochemical, and morphological traits of Mullein were affected by drought stress. A randomized completely blocks design with four treatments and four replications was used for this study. T1 (100% of field capacity), T2 (80% of field capacity), T3 (60% of field capacity), and T4 (40% of field capacity) were the stress treatments. Plant height, length of inflorescence, number of leaves per plant, flower diameter, flower yield, relative moisture content, proline, chlorophyll a and b, total phenol, flavonoid, and antioxidant activity were the characteristics that were examined. The analysis of variance results indicated that antioxidant activity and leaf number were not significantly affected by drought stress, but other variables were significantly affected (p <0.05). The findings demonstrated that drought stress resulted in a significant increase in proline and total phenol content and a significant decrease in morphological traits, flowers production, relative water content, and chlorophyll a and b. T1 and T4 had the greatest (9.99 mg Q/g DW) and lowest (91.9 mg Q/g DW) total flavonoid contents, respectively. Total phenol contents ranged from 28.1 (mg GAE/g DW) for T4 treatment to 27.47 (mg GAE/g DW) for T1 treatment.