Vali OLLAH Ghasemi Omran

• PhD
• Professor (Assistant) at Sari Agricultural Sciences and Natural Resources University

The beneficial role of glycine betaine (GB) in the adaptation of plants to abiotic stresses is well known; therefore, the study of physiological and molecular responses induced by exogenous GB under NaCl stress can provide a suitable reference for the application of this compound to enhance the adaptation of plants to salinity. The present study wa...

Pomegranate is a tropical and subtropical fruit sensitive to chilling injury during its cold storage, leading to quantitative and qualitative losses, as well as reduced economic value. Recently, melatonin has been considered as an environmentally friendly treatment to maintain the postharvest quality of horticultural products. In this study, the ef...

Background Flower color is one of the main characteristics of ornamental plants. Aurones are light yellow flavonoids produced in the petals of a limited number of plant species including snapdragon ( Antirrhinum majus ). As a commercially-recognized species, African violet can be found in various colors except yellow. This research, aiming at chang...

The mutation in the meristem layers creates different genetic backgrounds (chimera) in the plant tissue. The mutation in L1 layer of shoot apical meristem generates a periclinal chimera. UF3GT is an effective enzyme in floral coloration, inducing anthocyanin accumulation in petals. This study investigates direct and indirect regeneration systems an...

Melatonin has been shown to play a variety of roles in regulating plant growth and response to various abiotic stresses, but its main function remains unclear in response to NaCl toxicity. The aim of the current study was to evaluate the effect of melatonin (0, 5, 10, and 20 μM) on growth, photosynthetic pigments, compatible solutes, ionic homeosta...

Introduction: Silybum marianum (L) Gaert.) Is a member of Asteraceae family, and silymarin is known as a valua effective substance in the plant, which is used to treat a number of diseases, such as liver disease. Chalcone synthase is one of the key enzymes in the production of silymarin. The fungal endophytes live in the tissues, without infection,...

Nowadays sweet violet (Viola odorata) is an ornamental-medical plant that considered as endangered and threatened species. On the other hand, biotic and abiotic stresses impose a major threat to agriculture. Here, we investigated the effects of salinity and drought stresses, based on polyethylene glycol (PEG; 1, 1.5, 2, 2.5, 3 and 4%) and NaCl (0,...

The color of African violet flowers (Saintpaulia ionantha Wendl.) is derived from anthocyanin pigments. A mutation in the L1 layer of the SAM suppresses the anthocyanin biosynthesis pathway and eventually generates a pinwheel phenotype of periclinal chimera (cells of different genotypes). The aim of the present research was to understand the colora...

In the present study, hairy root induction from leaf and stem explants in two Hyssopus species (H. officinalis and H. angustifolius) was assessed using four Agrobacterium rhizogenes strains including A4, ATCC15834, LB9404 and 2656 on three culture media (MS, ½ MS, B5) as a factorial experimental based on a completely randomized design with three re...

In order to investigate the role of Piriformospora indica endophyte fungi on some vegetative, physiological and morphological parameters along with antioxidant activity of stevia (Stevia rebaudiana) under cadmium (Cd) stress, an in vitro experiment was conducted. Experiment arranged in completely randomized design with three replicates. Treatments...

Key message Piriformospora indica confers salt tolerance in tomato seedlings by increasing the uptake of nutrients such as N, P and Ca, improving K⁺/Na⁺ homoeostasis by regulating the expression of NHXs, SOS1 and CNGC15 genes, maintaining water status by regulating the expression of aquaporins. Abstract Piriformospora indica, an endophytic basidio...

The influence of endophyte fungus piriformospora indica on characteristics of the growth, water status, photosynthetic pigments concentration, gas exchange, and chlorophyll fluorescence of tomato plants under salt stress (0, 50, 100 and 150 mM) was studied in the greenhouse. Under salt stress, mycorrhizal tomato plants had higher dry weight of shoo...

In order to evaluate the effect of Piriformospora indica fungi inoculation on antioxidant systems and photosynthetic pigments of stevia medicinal plant under salt and drought stresses, an in vitro experiment was conducted. Experiment arranged in factorial based on completely randomized design with three replicates. Treatments were three levels of o...

More than 20% of irrigated land has been influenced by salt stress, decreasing crop production. In this research, we investigated the effect of different levels of salinity (0, 50, 100 and 150 mM NaCl) and the efficiency of Piriformospora indica on growth, biochemical traits, antioxidative defense system in tomato (Solanum lycopersicum L.). NaCl st...

Nowadays, salinity has become an increasingly serious environmental issue that affects the growth and yield of a majority of plants. In the present work, the influences of Piriformospora indicia on gas exchange, water potential, osmolyte content, Na/K ratio and chlorophyll fluorescence of tomato plants under three salinity levels (0, 50, 100 and 15...

The present study was performed to evaluate the effects of different concentrations of ethyl methane sulfonate (0, 0.1, 0.2 and 0.5%) on some physiological characteristics of regenerated plants from calli of stevia at 30, 60 and 120 min under various levels of salinity stress (0, 50 and 100 mM of NaCl). This experiment was carried out based on comp...

Stevia (Stevia rebaudiana Bertoni), with great potential as a natural sweeteners source, has a high content of sweeteners, which are up to 150 times sweeter than sugar, but virtually with no calories. Stevia also suitable to be cultivated in semiarid climates and coastal areas, which are characterized by the low quality of the irrigation water. Soi...

Induced mutagenesis causes an increase variation of some products with limited genetic resources. In this study, the antioxidant enzymes activity, biochemical properties and glycoside content of Stevia were assessed by EMS (chemical mutagen) based on two experiments as factorial with completely randomized design with three replications. The results...

The present study was carried out to investigate micropropagation possibility and determine the optimal medium composition and plant growth regulators (PGRs) combinations under in vitro conditions in Iranian cannabis. The cotyledon and epicotyl explants obtained from 1 month old in vitro grown seedlings were used in MS medium containing BA (0.1, 0....

This research was conducted to study the effects of two explant types (leaf disc and petiole) and phytohormones including 5 levels of Benzyl Adenine (BA) (0, 0.2, 0.5, 1, 2 mgL-1) and 2 levels of Indole Butyric Acid (IBA) (0 and 0.5 mgL-1) onin vitro micropropagation of African violet (Saintpaulia ionantha). Based on primary data, experiments were...

This study surveyed a rapid, efficient and reproducible protocol for in vitro shoot regeneration and rooting by different explants and different concentration of BAP. Due to optimization of shoot regeneration, two media including of MS and modified MS (MS salts with double concentration of CaC21, and B5 vitamins), different explants such as decapit...