نوع مقاله : مقاله پژوهشی
1 کارشناسی ارشد گیاهان زینتی، دانشگاه آزاد واحد شبستر
2 کارشناسی ارشد درختان میوه، دانشکده کشاورزی، دانشگاه تبریز
3 دانشیار، دانشکده کشاورزی، دانشگاه آزاد شبستر
عنوان مقاله [English]
Salinity stress is one of the most important limitations of plant growth in arid and semi-arid regions that affects the production of many crops.Salicylic acid is an internal growth regulator with phenolic nature that plays a role in regulating physiological processes and provides protection against environmental stresses. In order to investigate the effect of salicylic acid on the morphological characteristics of Haft Rang cultivar under potting conditions and different salinity stresses on some growth traits including flowering branch length, flowering branch diameter, flower diameter, fresh weight, dry weight, leaf area, specific leaf area Chlorophyll index, flowering branch longevity, number of blind branches, this study was evaluated as a factorial experiment in a randomized complete block design with four replications. The first factor was salicylic acid at three concentrations (300, 200, 0 mg / l) and the second factor was salinity at four levels (3.5, 3, 2.5, 0 dS / m). The highest flowering branch length, flower diameter, leaf area and chlorophyll index were related to the control treatment. Also, the fresh and dry weight of plants treated with a concentration of 2.5 dS / m salinity was higher than control plants. The application of salicylic acid only affected the factors of flowering branch length and flower diameter. The results showed that the interaction of salicylic acid and salinity was significant only on flower diameter. Rose is one of the plants sensitive to salinity and is able to tolerate salinity up to 3 dS / m. Therefore, studies in this field have been done less in roses than other ornamental plants and require studies. It is more in this field. Therefore, the practical purpose of this study is to investigate some morphological and physiological traits of rose cultivar Haft Rang (rainbow) using salicylic acid treatment under salinity stress in potted conditions to introduce the best available treatments.
This experiment was carried out in the spring and summer of 1995 in the open air conditions in Tabriz at the Abbas Mirza Forest Promenade. In this experiment, salicylic acid (300,200,0 mg / l) and sodium chloride (as saline water with different ECs of 0, 2.5, 3 and 3.5) were used to treat the rose flowers. The substrate used in this experiment was prepared with a mixture of sand and clay in a ratio of 3: 1 clay with EC less than 1 dS / m. Plant samples used in this experiment were obtained from rose cultivar of seven colors (Rainbow). After transferring the flowers to the desired pots, treatments were started. This research was performed as a factorial experiment in the form of a randomized complete block design with 4 replications, so that there were 12 pots in each block. The first factor was SA concentration at 3 levels (0, 200 and 300 mg / l) and the second factor was salinity at 4 levels (0, 2.5, 3 and 3.5 dS / m). Initially, 48 pots were selected and treatments were applied. How to use salicylic acid as a foliar spray and one week before salinity stress and then the plants were irrigated with salt water (irrigation with salt water was repeated once a week for 3 weeks). They were also irrigated once a week with city water to prevent salt accumulation (all pots had the necessary drainage). The number of blind branches (flowerless branches) and the number of flowering branches resulting from the growth of treated buds in the block were counted and recorded. This trait from the beginning of the experiment until the appearance of changes in the appearance of plants, ie the time of salt extraction, burns and leaf fall (which can be due to lack of nutrients, disease, etc. Therefore, plants are able to tolerate salinity). Were not). Recorded by day After harvesting the branches, the length of the flowering branch was measured from the harvested place to the end of the flower bud by a ruler. Branch diameter was measured between the first and second buds by caliper. Calipers were used to accurately measure the flower diameter of harvested branches. A scale with an accuracy of 0.01 g was used to measure the fresh weight of the harvested branches. The branches were then transferred to paper bags to measure dry weight. The bags containing the branches were placed in an oven set at 72 ° C for 48 hours, after which their dry weight was measured by a scale. The length of each leaf of all harvested branches (from the beginning of the petiole to the end of the main leaf of the middle leaves of flowering and blind branches) was accurately measured with a caliper. By calculating the leaf area and measuring the dry weight of the leaves of the dried branches in the oven, the special leaf area was used. The chlorophyll meter (Minolta SPAD-502) of Tabriz University was used to measure the chlorophyll index of the leaves. For this purpose, 2 upper and middle leaves (branches of treated flowers) and 3 points were measured in each leaf and their average was recorded. In order to analyze the variance of the data according to the design model and compare the means by Duncan's multiple domain test method (after checking the uniformity of the data) SPSS software with version 23 was used.
Based on the results obtained in this experiment and considering that the purpose of this experiment was to increase salinity stress resistance using salicylic acid hormone, so achieving this property can be economically and commercially important, Because it leads to increased plant yield per unit area (especially in areas with soils with different salinity levels). On the other hand, the highest flowering branch length, flower diameter, leaf area, chlorophyll index were observed in control plants. Also, the fresh and dry weight of plants treated with a concentration of 2.5 dS / m had a slight effect on salinity compared to control plants and the application of salicylic acid only on the factors of branch length and flower diameter and also the interaction of salicylic acid and salinity only on the diameter on The flower was effective.