Showing 3 results for Physiological Characteristics
F. S. Sadoogh, H. Shariatmadari, A. H. Khoshgoftarmanesh, M. R. Mosaddeghi,
Volume 5, Issue 2 (7-2014)
Abstract
In drought stress conditions, besides the inhibition of water uptake, the plant nutrients availability and uptake are also limited. Proper nutrition is known as a management procedure for plant production under different environmental-stress conditions. Generally, the combined effects of drought and deficiency of potassium and zinc on plant water content and some physiological parameters reduce yield quantity and quality. This investigation was conducted to assess the interactive effect of different levels of potassium as KNO3 (0.6, 3 and 6 mM) and zinc as ZnSO4 (0, 1 and 2 μM), under drought stress conditions induced with PEG 6000 (0, 55 and 110 g/L PEG 6000) on some water status indices and physiological parameters of tomato in hydroponic culture. The results showed that interaction of drought, potassium and zinc on shoot and root dry weight, leaf chlorophyll and proline content and percentage of root ion leakage was significant. Both potassium and zinc improved water status of the plants however the effect of zinc on leaf water potential was not significant. Drought stress increased the chlorophyll content and decreased the sulfhydryl groups. Application of a high level of potassium in the nutrient solution increased root ion leakage.
J. Bardel, A.r. Sirousmehr,
Volume 6, Issue 1 (5-2015)
Abstract
To study the activity of some antioxidant enzymes and accumulation of compatible osmolytes affected by different concentrations of chromium (Cr+3) (0, 5, 10, 15 and 20 mg/kg soil) combined with different levels of manure (0, 10 and 20 ton/ha) in basil (O. basilicum L.), a factorial experiment, based on completely randomized design with four replications, was carried out at Research Greenhouse of Zabol University in 2012. Results of this study indicated that increasing the level of Cr+3 from 0 to 20 mg/kg soil, when 20 ton/ha manure was applied, decreased the activity of catalase (CAT), ascorbate peroxidase (APX) and glutathione peroxidase (GPX) enzymes decreased from 0.008, 0.537 and 0.081 to 0.006, 0.305 and 0.071 µmol H2O2/mg protein, respectively. This may be caused by the improvement in physiological activities of the plant in the presence of organic compounds. It seems that application of different amounts of manure led to an increase in leaf proline and carbohydrates content, via availability of macro- and- micro nutrients, especially nitrogen, even when different levels of Cr3+ heavy metal existed in the growth medium. The obtained correlation coefficients indicated a significant positive relationship between most physiological traits, and the highest correlation coefficient (0.84) was found between proline and soluble carbohydrates. It appears that organic compounds, such as manure, have considerable potential to reduce the harmful effects of Cr3+ heavy metal and improve physiological indices of basil.
M. Baba Rabi, H. Zarei, A. Eskandari, S. Badeli,
Volume 9, Issue 4 (3-2019)
Abstract
Polianthes is one of the most important cut flowers in Iran and the world, and increasing its quality and quantity is one of the most important issues. In this study, to evaluate the effects of foliar application of salicylic acid and thiamine in two cultivation systems on biochemical characteristics of tuberose, a factorial experiment, based on completely randomized design with 3 replications, was conducted in the greenhouse of Gorgan University of Agricultural Sciences and Natural Resources. Treatments consisted of salicylic acid (concentrations of 0, 50, 100, 150 and 200 mg/L) and thiamine (100 and 150 mg/L) in two soilless and soil culture systems. Results showed that the treatments had significant effects on biochemical characteristics. In this experiment, the highest amount of catalase enzyme was 1.69 μmol peroxide per minute per mg and 1.175 μmol/g fresh weight per minute peroxidase was related to 50 and 100 mg/L salicylic acid treatments, respectively, and the lowest amount was observed in control treatment (0.87 and 0.56) respectively. Therefore, it seems that salicylic acid and thiamine can increase the photosynthetic pigmentation and activities of antioxidant enzymes of tuberose flowers. Also, the highest amount of concrete (8.49%) was reported in 200 mg/L salicylic acid treatment and its lowest value (4.47%) was reported in control treatment. Based on the results of this research, the soilless system was in all physiological characteristics at a higher level than the soil system. So that the amount of chlorophyll a, b, total and reduced sugar in soilless substrate was 0.16, 0.41, 0.57 and 0.11 mg per gram of fresh weight, respectively. Concrete and protein content were 0.07% and 0.33%, respectively, which were the highest in comparison to the soil culture system.
