scholarly journals Physiological and biochemical changes in Matricaria chamomilla induced by Pseudomonas fluorescens and water deficit stress

2018 ◽  
Vol 111 (1) ◽  
pp. 63 ◽  
Author(s):  
Hamid MOHAMMADI ◽  
Mohammad ESMAILPOUR ◽  
Samaneh GHORBI ◽  
Mehrnaz HATAMI
Keyword(s):  
Essential Oil ◽  
Pseudomonas Fluorescens ◽  
Water Deficit ◽  
Stress Condition ◽  
Growth Parameters ◽  
Dry Mass ◽  
Water Deficit Stress ◽  
Matricaria Chamomilla ◽  
Seedling Inoculation ◽  
Oil Concentration

Environmental stresses and rhizosphere microorganisms affect growth parameters and accumulation of active ingredients especially in plants with medicinal properties. The present study examined the effects of chamomile (<em>Matricaria chamomilla </em>L.) seedling inoculation with <em>Pseudomonas fluorescens</em> PF-135 strain on its growth parameters, photosynthetic pigments, proline, malondialdehyde (MDA), and hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) content, and essential oil concentration at both regular watering and water deficit experiments. Based on the obtained results, water deficit stress reduced root dry mass, and flower fresh and dry mass as well. However, amount of H<sub>2</sub>O<sub>2</sub> and MDA in root and shoot tissues were considerably lower in inoculated plants compared to non-inoculated ones under both normal watering and water deficit regimes. It indicates that lipid peroxidation and production of reactive oxygen species has been diminished in inoculated plants. Also, essential oil content in inoculated plants significantly increased compared with that of non-inoculated ones under water deficit stress condition. It can be concluded that <em>P. fluorescens </em>PF-135 strain has an outstanding potential to alleviate adverse effects of water deficit on plant growth, and hence can be used as an excellent PGPR in order to boost chamomile productivity especially under water deficit stress condition.

scholarly journals Effects of TiO2 nanoparticles and water-deficit stress on morpho-physiological characteristics of dragonhead (Dracocephalum moldavica L.) plants

2016 ◽  
Vol 107 (2) ◽  
pp. 385 ◽  
Author(s):  
Hamid Mohammadi ◽  
Mohammad Esmailpour ◽  
Ali GHERANPAYE
Keyword(s):  
Water Deficit ◽  
Foliar Application ◽  
Block Design ◽  
Membrane Damage ◽  
Morphological Characteristics ◽  
Dry Mass ◽  
Water Deficit Stress ◽  
Malondialdehyde Content ◽  
Randomized Complete Block Design ◽  
Nano Titanium Dioxide

<p>Water-deficit stress is the most important environmental factors limiting plant growth, and production. Nano-titanium dioxide (nano anataseTiO<sub>2</sub>) can have various profound effects on the crop physiological, biochemical and morphological characteristics. In the present research, the influences of different concentrations ofTiO<sub>2</sub> nanoparticles (NPs) (0, 10 and 40 ppm) and water-deficit stress on Dragonhead (<em>Dracocephalum moldavica</em> L.) were investigated in a factorial experiment based on randomized complete block design with three replications. Results showed that under normal irrigation, foliar application of 10 ppm TiO<sub>2</sub> NPs increased plant shoot dry mass and essential oils content. Under water-deficit stress condition, plants treated with 10 ppm TiO<sub>2</sub> NPs had more proline and much less H<sub>2</sub>O<sub>2</sub> and malondialdehyde content as compared to untreated plants. Therefore, it can be concluded that proper concentration of TiO<sub>2</sub> NPs probably can be used as an exogenous stimuli for improvement of shoot growth and essential oil content in plants. Furthermore, water-deficit stress-induced damages such as oxidative stress and membrane damage can be ameliorated by foliar application of TiO<sub>2</sub> NPs at appropriate concentrations.</p>

Evaluation changing of essential oil of laurel (Laurus nobilis L.) under water deficit stress conditions

2016 ◽  
Vol 91 ◽  
pp. 170-178 ◽  
Author(s):  
S. Maatallah ◽  
N. Nasri ◽  
H. Hajlaoui ◽  
A. Albouchi ◽  
A. Elaissi
Keyword(s):  
Essential Oil ◽  
Water Deficit ◽  
Stress Conditions ◽  
Water Deficit Stress ◽  
Laurus Nobilis

scholarly journals Early seedling growth affected by CuSO4 and its combination with PEG 6000 in maize

2019 ◽  
Vol 6 (2) ◽  
pp. 160-169
Author(s):  
Mamta Hirve ◽  
Meeta Jain
Keyword(s):  
Water Deficit ◽  
Growth Parameters ◽  
Germination Percentage ◽  
Stress Factors ◽  
Metal Exposure ◽  
Water Deficit Stress ◽  
Peg 6000 ◽  
Anatomical Characteristics ◽  
Abiotic Stress Factors ◽  
Maize Seeds

Several abiotic stress factors are faced by the plants in nature, including metal exposure and water deficit condition. The present study was undertaken to investigate the effects of copper and its combination with water deficit, on growth and anatomical characteristics of Zea mays L. (maize) cv. Ganga safed-2 seedlings. Seeds were treated with CuSO4 (0-1000µM) for inducing Cu stress, PEG 6000 (0-10%) for inducing water deficit stress and their combination for combined stress for 5 days. Germination %, growth parameters, % phytotoxicity, and root anatomical characteristics were analyzed. Treatment of maize seeds with 0-1000µM CuSO4 significantly reduced almost all the growth parameters, except germination %. Root growth was inhibited significantly at 100µM and higher concentrations of CuSO4, however, for shoot growth, ?300µM are inhibitory. Germination percentage was not affected by the supplementation of Cu, indicating the tolerant nature of Ganga safed-2 maize genotype at germination stage. Treatment with Cu (?300µM) and PEG 6000 (10%), decreased the growth of maize seedlings with prominent effect on root by Cu and on the shoot by 10% PEG. Anatomical modifications in root were noticed with both the stresses, individually and in combination.

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