جستجوی مقالات مرتبط با کلیدواژه "superoxide dismutase" در نشریات گروه "اکولوژی"

Gibberellic acid (GA3) is known as important plant growth regulators which are also considered to induce various physiological responses in plants, which is unduly suited for improving and stimulating, photosynthetic activity, and plant growth. Gibberellic acid, a tetracyclic di-terpenoid compound which is known as a plant hormone stimulating plant growth and development. Gibberellins may have an important function in different metabolic pathways influencing several characteristics, such as nitrogen redistribution, nitrogen metabolism, translocation of assimilates, chlorophyll production and degradation. This review article aims to provide an overview of the effects of gibberellic acid on yield and yield components of wheat and survey of different mechanisms of action of gibberellic acid in different plants. The keywords searches for gibberellic acid, wheat, root growth, gibberellin, plant hormone, and plant growth were performed by using PubMed, Google scholar, Scopus, and Web of Science.

Plant Growth Regulators Improve Yield and Yield Components of Wheat under Deficit Irrigation Treatments With Considering the Productive Capacity Mohammad Hashem Azizi 1 , Ali Soleymani 1,2* , and Hamid Reza Javanmard 11- Department of Agronomy and Plant Breeding, Isfahan (Khorasgan) Branch, Islamic Azad University,Isfahan, Iran 2- Plant Improvement and Seed Production Research Center, Isfahan (Khorasgan) Branch,Islamic Azad University, Isfahan, Iran  *Corresponding email address: a.soleymani444@gmail.com   Received:  15 November October 2022                                Accepted: 28  January  2023   Abstract Wheat (Triticum aestivum L.) is one of the major crop plants, which is an important source of various compounds such as carbohydrates, lipids, proteins, and nutrients. Several methods have been used so far to improve wheat growth, seed yield and yield competition under drought stress, and one of the most important one is application of different plant growth regulators (PGRs). In order to determine the effects of different PGRs on the grain yield and yield components of wheat under water shortage treatments, an experiment was designed as a split plot on the basis of a complete randomized block design with three replications in two different experimental locations, namely Abarkuh and Faragheh in 2018-2019. Main plots were the evaporation from the pan class A, namely control treatment (80 mm), 100 mm, and 120 mm evaporation from pan class A, and subplots were control treat (water), foliar application of PGRs of gibberellic acid (GA3 at 100 mgL-1), salicylic acid (SA at 1.5 mM), benzyl adenine (BA at 60 mgL-1), GA3+SA, as well as superoxide dismutase (SOD at 5 gL-1). In this experiment the effects of irrigation treatments and foliar application of PGRs were significant on all experimental characteristics, such as plant height, spike length, the number of tillers per plant, and peduncle length. The highest values of plant height (68.06 cm), spike length (8.81 cm), the number of tillers per plant (3.37), and peduncle length (9.55 cm) was related to 80 mm evaporation from pan class A, and combined application of gibberellic acid and salicylic acid also had obtained the maximum plant height (69.47 cm), spike length (9.23 cm), the number of tillers per plant (3.93), and peduncle length (10.40 cm). The maximum value of plant height (71.27 cm), spike length (10.53 cm), the number of tillers per plant (5.47), and peduncle length (11.69 cm) was related to interaction between 80 mm evaporation from pan class A, and combined application of gibberellic acid and salicylic acid. Other experimental characteristics such as leaf area index (LAI), the number of grains per spike, one thousand grain weight, grain yield, biological yield and harvest index (HI) were significantly affected by irrigation treatments and different PGRs. The highest values of LAI at anthesis stage (187.71), the number of grains per spike (28.53), one thousand grain weight (32.35 g), grain yield (555.18 ton/ha), biological yield (1178.92 ton/ha), and harvest index (47.11 %) were obtained for interaction between 80 mm evaporation from pan class A and combined application of gibberellic acid and salicylic acid. According to the findings, the combined application of gibberellic acid and salicylic acid was the most effective treatments followed by usage of superoxide and benzyl adenine which reveal the importance of application of plant hormones for wheat growth under drought conditions. To sum up, it is important to use tested PGRs to increase wheat yield and yield components particularly under drought stress condition.

The aims of this study were to assess the effects of drought stress on peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) activities as well as free proline content and growth parameters of Pistacia khinjuk seedlings under drought stress. Therefore, the one-year seedlings of Pistacia khinjuk subjected to water stress (25%, 50%, 75%, and 100% field capacity) for 8 months in greenhouse condition. Results showed that drought stress decreased height, collar diameter, shoot dry weight and root dry weight of P. khinjuk seedlings. But it had different effects onantioxidant enzyme activities in root and shoot of P. khinjuk seedlings. Drought stress increased CAT activity in shoot and root of seedlings and its activity was higher in 25% field capacity (FC) than other treatments. Also, the POD enzyme activity increased in root and shoot of seedlings subjected to drought stress. The SOD activity was at the lowest level in 100% FC than other treatments. The results also showed that free proline accumulation was lower in well watered seedlings and increased under drought stress.