Farzad Parsadoost, Mohsen Dehqani, Masoud Tadayonnejad, Mohsen Calageri,
Volume 10, Issue 41 (vol. 10, no. 41 2021)
Abstract
One of the most important problems in arid and semi-arid regions is the salinity of water and soil. poplars, which are native to Iran, are found in many climates. In crossbreeding programs, the transfer of salinity traits and resistance to salinity stress from P.euphratica, and on the other hand, the transfer of good quality trait form of the trunk and high growth of spruce, bruised are special importance. For this purpose this study was conducted to evaluate the rate of resistance to salinity stress and growth of four poplar colonies (Populus alba 58.57, Populus alba 44.9, Populus euphratica, P. euphratica x P. alba 44/9) in the form of complete randomized block design with three replications and was performed for 3 years in Rudasht salinity research station. For this purpose, P.euphratica, P.alba and Hybrid of P.euphratica trees were cut down and planted. The physiological characteristics of the leaf, including proline, sugar, chlorophyll a and b, carotenoid, total protein, peroxidase value and relative moisture content were measured according to standard methods. The results of the physiological characteristics of the leaf showed that poplar colonies had significant differences in terms of proline, total protein and relative humidity percentage but carotenoids, chlorophyll a and b, total chlorophyll and chlorophyll a / b ratio did not show a statistically significant difference. However, the highest amount of chlorophyll a, b and total chlorophyll was obtained in the leaf of hybrid clone. However, the highest amount of chlorophyll a, b and total chlorophyll in the leaf was related to hybrid clone and were equal to 0.76, 0.36 and 1.12 mgg-1 dry matter, respectively. Growth characteristics of seedlings including living percentage, diameter, height, leaf area, leaf thickness, leaf area and leaf dry matter percentage were also measured. The results of analysis of variance of vegetative characteristics of poplar colonies showed that the coefficients of percentage of survival, diameter and height are statistically significant at the level of 5%. The average comparison test showed that P.euphratica with 93% and Colon Hybrid with 85% had the highest survival rate compared to bruised colonies. In addition, P.euphratica species with a diameter growth of 3.8 cm and a height of 160 cm had the highest amount of vegetative growth. In general, according to the vegetative and physiological characteristics of seedlings, Pede species and hybrid clone can be recommended under salinity stress.
Masoud Tadayonnejad, Mohsen Dehqani, Farzad Parsadoust,
Volume 10, Issue 44 (vol. 10, no. 44 2021)
Abstract
Although phosphorus owns the lowest amount between essential elements in the plant, but due to its important role in the vital processes of the plant, its supply during the growing period of wheat is essential. This study was conducted to investigate the response of wheat to the use of phosphorus in different stages of its growth and in different conditions of water salinity in pots and in soilless culture system. This experiment were performed in the factorial experiment in a completely randomized design with three factors of irrigation water quality (2 and 8 dS / m), phosphorus concentration (30 and 45 mg/l) and the stage of growth of wheat that receives phosphorus (seedling stage, tillering stage, elongation stage of Stem, flowering and seed filling) and three replications. Plants were harvested at the end of the physiological maturation phase. Root and shoot dry weight, shoot phosphorus concentration, chlorophyll and catalase and peroxidase enzymes were measured. Increased salinity decreased 48% phosphorus concentration of shoots, 40% dry weight of roots and shoots and 100 and 50% increase of catalase and peroxidase, respectively. Increasing the concentration of phosphorus from 30 to 45 mg/l caused 10 and 36% increase in dry weight of roots and shoots, respectively. The highest amount of chlorophyll, root and shoot dry weight due to the use of phosphorus was observed in the stem elongation stage and the lowest values were related to the application of phosphorus in the seedling stage. Based on this research, it seems that fertilization is necessary during the wheat growth period, especially in the stage of elongation of the stem and flowering.
