BACKGROUND: The use of growth-promoting hormones and organic acids is one of the ways to deal with environmental stresses.OBJECTIVES: The present study was conducted to assess the effect of these treatments on saffron vegetative and reproductive traits, to use organic inputs properly, take steps towards sustainable production and increase quality of important medicinal plant.METHODS: Current research carried out via factorial experiment was conducted in Islamic Azad University, Isfahan (Khorasgan) Branch (2018-2019) in a completely randomized design with three replications. The treatments were control, Salicylic acid (1 and 2 mM), humic acid (15 and 30 mM) and Jasmonic acid (5 and 10 μM) with two salinity levels (1 and 4 ds.m-1). The evaluated traits included chlorophyll a, b and total chlorophyll, the number of flowers, flowering stem and leaves, petiole length, fresh and dry weights of leaves, stigma weight, and fresh weight of flowers.RESULT: The highest levels of chlorophyll a and total chlorophyll were belonging to humic acid 30 and control treatments under salinity 1. The highest amount of chlorophyll b was observed in humic acid 30 and control treatments under salinity 1 and salicylic acid 2 under salinity 4. The highest number and fresh weight of flowers were obtained from the control treatment under salinity 1. The tallest petioles and flowering stems were observed in Jasmonic acid10 under salinity1. The highest leaf length was belonging to salicylic acid2 under salinity1. The highest leaf fresh weight was belonging to salicylic acid2 under salinity1 whereas of Humic acid15 under salinity1 produced the highest dry weight of plant leaves. The highest stigma weight was observed in Jasmonic acid5 and the control under salinity1. As a result, application of plant growth regulators and humic acid can reduce effect of salinity stress in saffron.CONCLUSION: As a final conclusion of this study, it can be said that the use of growth-promoting hormones (salicylic acid) and organic acids (humic acid) under environmental stress conditions can improve morphological and vegetative characteristics such as chlorophyll and biomass produced in some plants such as saffron. تفاصيل المقالة

Water Use Efficiency of Common Sorghum and Grain Corn Cultivars and Comparing the Effect of Water Deficit on These Cultivars Nasrin Safian1, Mohammadreza Naderidarbaghshahi2*, Hamid Reza Salemi3, Massoud Torabi4, Ali Soleimani5 1- PhD Student, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 2- Associate Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 3- Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran. 4- Assistant Professor, Isfahan Agriculture and Natural Resources Research Center, Isfahan, Iran. 5- Professor in Agronomy, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. * Corresponding Author E-mail: mnaderi@khuisf.ac.ir Received: 20 October 2022 Accepted: 8 January 2023 Abstract Drought stress is the most important abiotic factor which limits the growth and production of plants in arid and semi-arid regions. In order to investigate the effects of irrigation regimes (100, 80 and 60% of the plant's water requirement based on the Penman-Monteith method) on grain yield of sorghum (Payam and Kimia) and corn (704 and Maxima) cultivars under the hot and dry climate of Isfahan, a split plots experiment was carried out in the years 2018-2019 in randomized complete blocks design with three replications. Results showed that the highest index of chlorophyll and grain fat was obtained from cultivar 704 and in 100% of irrigation. Cultivar 704 produced the highest grain lignin under 60% and 80% irrigation regimes. Kimia cultivar produced more lignin compared to Payam cultivar. Payam cultivar produced the most yield and the highest plants under irrigation regimes of 100 and 80. Compared to Payam cultivar, Kimia showed more 1000 grains weight under different irrigation regimes. The harvest indices of Kimia and Payam cultivars showed significant decreases by increasing the drought. Different cultivars have different mechanisms to tolerate drought stress. As a drought tolerant plant, Sorghum was less damaged by stress than corn. Biochemical traits of plants can be used as stress resistance indicators in breeding programs and the selection of resistant cultivars. تفاصيل المقالة