Showing 2 results for Hashempour
Assistant Rahmatollah Gholami, Abuzar Hashempour, Issa Arji, Aboalmahsan Hadjiamiri,
Volume 10, Issue 45 (vol. 10, no. 45 2021)
Abstract
In order to investigate the effects of kaolin foliar application on growth, physiological and biochemical characteristics of some olive cultivars in Dalahu Olive Research Station in Sarpolzahab city, a factorial experiment in a randomized complete block design with three replications and two factors (Olive cultivars and kaolin concentrations) was done in 2019. The used six olive cultivars included Amphysis, Sevillana, Roughani, Manzanilla, Konservolia and Zard. Two stages of complete foliar spraying of olive trees with kaolin at zero concentrations as control (foliar spraying), 2 and 4% in mid-July and mid-August (due to hot and dry weather during this period) were carried out and its effects on growth, physiological and biochemical characteristics of olive cultivars were evaluated. The desired vegetative traits such as length and diameter of stem as well as relative leaf water content, ion leakage, leaf proline content, total phenolic contents, total soluble sugars, chlorophyll content and catalase and peroxidase activity were measured in different treatments and cultivars. The results showed that the response of the studied olive cultivars to foliar application of different levels of kaolin was different. Manzanilla cultivar with the highest relative content of leaf water (79.97%) and soluble sugars (10.78 mg.g-1 FW) and the lowest ion leakage rate (9.02%) and malondialdehyde (1.47 nmol.g-1 FW) ) and Konservolia cultivar with the highest amount of total chlorophyll (1.5 mg.g-1 FW) and peroxidase (2.57 units.mg-1) and catalase (0.96 units.mg-1) were the best cultivars. Foliar application of kaolin improved growth characteristics, relative water content of leaves and chlorophyll content of olive cultivars in hot conditions. Also, kaolin used in olive cultivars reduced the accumulation of malondialdehyde and total phenol, which was associated with enhanced activity of antioxidant enzymes. Generally, the results of this study showed that kaolin spraying can be used to protect olive in warm regions.
Mahsa Peymaei, Vahid Sarabi, Hossein Hashempour,
Volume 12, Issue 54 (vol. 12, no. 54 2023)
Abstract
In order to study the effects of the application of two-plant growth regulators/proline on some physiological characteristics in fennel under water-deficit stress conditions, an experiment was conducted as a split-plot based on a randomized complete block design with three replications at the research farm, agricultural faculty of Azarbaijan Shahid Madani University, Tabriz-Iran, in 2019. Factors were three irrigation regimes (irrigation at the field capacity (I1), irrigation after depleting 65 (I2) and 85% (I3) of the available water capacity) as the main plot and four foliar spraying (control, exogenous application of methyl jasmonate, uniconazole and proline + triton X-100) as a subplot. Results indicated that the minimum relative water content, membrane stability index, chlorophyll a, b, total (chl.), carotenoids and maximum proline, total soluble sugars, and malondialdehyde contents in leaves were obtained from severe water-deficit stress conditions. Maximum membrane stability index, chlorophyll a, total (chl.), carotenoids, and total soluble sugars were related to plant growth regulator application, especially methyl jasmonate. Interaction effects revealed that physiological growth characteristics were significantly reduced in the control treatment (except for proline and total soluble sugars) compared to foliar spraying treatments by increasing water-deficit stress conditions in the soil. The spraying with methyl jasmonate had a better effect on reducing the effects of water deficit stress on the physiological characteristics of the fennel by regulating of internal reactions and induction of antioxidant defenses. Therefore, methyl jasmonate can be used in water-deficit stress conditions in arid and semi-arid areas and reduce its harmful effects on the fennel plants.
