Agriculture
Majid Rostami; Masoumeh Maleki; Ali Reza Effati
Abstract
In order to investigate the effects of different types of nano-fertilizers on some of the physiological characteristics of saffron (i.e. antioxidant enzymes, reducing and non-reducing sugars, photosynthetic pigments, total phenol content and relative water content of leaf) the current experiment was ...
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In order to investigate the effects of different types of nano-fertilizers on some of the physiological characteristics of saffron (i.e. antioxidant enzymes, reducing and non-reducing sugars, photosynthetic pigments, total phenol content and relative water content of leaf) the current experiment was conducted at Malayer University during 2014-2015 growing season. The study was performed based on randomized complete block design (RCBD) with six treatments and three replications. The experimental treatments were control and five different types of nano-fertilizers (iron: Fe, boron: B, manganese: Mn, potassium: K and zinc: Zn). The effects of experimental treatments on relative water content, protein and total phenol content, reducing and non-reducing sugars were significant but there was no significant effect on chlorophyll b, leaf carotenoids, Catalase and Proxidase activity. Although the difference between nano-fertilizers and control treatment for chlorophyll a and also total chlorophyll was not significant but the highest amount of chlorophyll a (1.53 mg.g-1 Fw) measured in Fe treatment and the lowest amount (0.93 mg.g-1 Fw) observed in Mn treatment. Based on results, all of the experimental treatment increased the relative water content of leaf comparing to control. The highest amount of total phenol content (0.27 mg.g-1 FW) with 10.5% increase compared to control observed in Mn treatment and just the difference of this treatment with control treatment was significant. By application of Zn, Mn, K and B nano-fertilizer leaf protein content comparing to control treatment significantly increased whereas the difference between Fe and control wasn’t significant. The highest concentration of leaf protein (1.56 mg.g-1 Fw) with 12% increase compared to control treatment observed in K and B treatments whereas the lowest concentration (1.36 mg.g-1 Fw) with 3% decrease compared to control was related to Fe treatment. The different response of studied characteristic to application of various nano-fertilizer showed that different physiological traits hadn’t the similar sensitivity to all of mineral nutrients therefore application of entire nano-fertilizers with the same concentration isn’t scientifically recommendable
Agriculture
Majid Rostami; Behrooz Mohmmad Parast; Rahil Golfam
Abstract
Salinity is a common stress in many parts of the world especially in Iran that decreases the yield and quality of many crops. In order to investigate the effects of different levels of salinity stress on some physiological indices of saffron, an experiment was conducted in the Malayer University in 2012. ...
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Salinity is a common stress in many parts of the world especially in Iran that decreases the yield and quality of many crops. In order to investigate the effects of different levels of salinity stress on some physiological indices of saffron, an experiment was conducted in the Malayer University in 2012. The experiment was arranged based on a completely randomized design (CRD) with four replications and six levels of salinity (i.e. 0, 2, 4, 6, 8 and 10 dS m-1). The results showed that the effect of salinity on chlorophyll a and chlorophyll b content was not significant. However, increasing the salinity stress up to 6 dS m-1 resulted in an increase of these photosynthetic pigments. The effect of salinity stress on leaf carotenoides and xantophyll content were significant and higher salinity stress resulted in an increase of these pigments. Moreover, the effect of salinity on leaf proline was not significant, but the amount of leaf glucose content increased by increasing salinity stress, significantly. The effects of experimental treatments on leaf dry weight, leaf length and relative water content were significant and negative, but there was no significant effect on leaf number. By increasing the concentration of salt, the mean weight of replacement corms decreased significantly whereas the corms number increased up to 4 dS.m-1 and then decreased significantly.
Agriculture
Majid Rostami; Roya Karamian; Zahra Joulaei
Abstract
Increasing the concentration of different heavy metals, such as lead, copper, nickel and other heavy metals in air, soil and water can pose negative effects on the entire ecosystem and cause harmful health consequences for all forms of life. The major sources of pollution in many parts of world are overburdens ...
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Increasing the concentration of different heavy metals, such as lead, copper, nickel and other heavy metals in air, soil and water can pose negative effects on the entire ecosystem and cause harmful health consequences for all forms of life. The major sources of pollution in many parts of world are overburdens of mine, industrial effluents, fertilizers and pesticides. In order to study the effects of different heavy metals on some of the physiological attributes of saffron such as photosynthetic pigments, Prolin and carbohydrates of leaf and the amount of crocin in the saffron stigmas, an experiment was conducted based on completely randomized design (CRD) with four replications and seven treatments. The experimental treatments were control and six different heavy metals (i.e. nickel nitrate, silver nitrate, zinc nitrate, copper carbonate, lead nitrate and manganese sulfate). Before sowing the corms, all of the heavy metals were added to the soil based on the concentration of 500 mg.kg-1 soil. The effects of experimental treatments on chlorophyll a, chlorophyll b, total chlorophyll and chlorophyll a/b were significant, but there was no significant effect on leaf carotenoids. Proline and soluble carbohydrates were significantly affected by the treatments. However, the effects of these treatments on reducing carbohydrates were not significant. Heavy metals also had significant effects on crocin content of the saffron stigmas. By using all of the heavy metals except for nickel nitrate, the amount of crocin increased.
