Alleviation of salt stress by plant growth regulators and IAA producing bacteria in wheat. Acta Phys Plant

Acta Physiologiae Plantarum (Impact Factor: 1.58). 07/2009; 31(4):861-864. DOI: 10.1007/s11738-009-0297-0


The action of phytohormone producing bacteria and plant growth regulators on germination and seedling growth of wheat under saline conditions were studied. Seed dormancy enforced by salinity (100 mM NaCl) was substantially alleviated and the germination was promoted by gibberellin, auxin, zeatin, and ethephon from 54 to 97%. The IAA producing bacterial strains Pseudomonas aureantiaca TSAU22, Pseudomonas extremorientalis TSAU6 and Pseudomonas extremorientalis TSAU20 significantly increased seedling root growth up to 25% in non-salinated conditions and up to 52% at 100 mM NaCl, compared to control plants. It is concluded that growth regulators considerably alleviated salinity-induced dormancy of wheat seeds. The facts mentioned above make it possible to recommend root colonizing bacteria that produce phytohormone to alleviate salt stress of wheat grown under conditions of soil salinity.

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    • "HORTI-6019; No. of Pages 10 wheat seedlings under saline conditions (Egamberdieva, 2009), and triacontanol ameliorated salt stress-induced damage when exogenously applied to wheat and radish plants (C ¸ avus¸o˘ glu and Kabar, 2008; Perveen et al., 2011). Moreover, salinity increased the activity of catalase (CAT), guaiacol peroxidase (GPX) and ascorbate peroxidase (APX), which are considered crucial enzymes in regulating intracellular hydrogen peroxide levels in plants. "
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    ABSTRACT: In recent years, new strategies have been proposed in order to improve the sustainability of production systems for horticultural crops. A promising tool would be the use of substances and/or microorganisms defined also as ‘biostimulants’ able to enhance crop quality parameters, nutrient efficiency and abiotic stress tolerance. Protein hydrolysates (PHs) are an important group of plant biostimulants based on a mixture of peptides and amino acids that have received increasing attention in the recent years due to their positive effects on crop performances. PHs are mainly produced by enzymatic and/or chemical hydrolysis of proteins from animal- or plant-derived raw materials. The current review gives an overview of the biostimulant properties of PHs on productivity and product quality of horticultural crops, in par- ticular fruit trees, vegetables, flower crops and ornamentals. After a brief introduction on PHs as plant biostimulants, this review focuses on the classification and chemical composition of PHs according to the source of proteins and method of protein hydrolysis. The plant uptake and transport of amino acids and peptides and the effects of PHs on primary and secondary metabolism as well as the biochemical and physiological processes conferring tolerance to abiotic stress are also covered. The review concludes by proposing several perspectives for future research aiming to understand the mode of action of PHs based on their composition and also to define the suitable time and dose of application.
    Scientia Horticulturae 09/2015; DOI:10.1016/j.scienta.2015.08.037 · 1.37 Impact Factor
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    • "Indole acetic acid (IAA) is the most abundant naturally occurring plant hormone, well known for its regulating function in plant growth and development (Rout 2006). Indole acetic acid is a type of auxin that stimulates growth through cell elongation and lateral root formation which probably support more absorption of minerals (Egamberdieva 2009). Research work with IAA on growth, yield attributes and fruit yield of tomato is scanty. "
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    ABSTRACT: Abstract The experiment was conducted at research field and laboratory of the Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh during the period of December 2013 to April 2014. The experiment was laid out in two factors randomized complete block design with three replications including three concentrations of Indole Acetic Acid (0, 100 and 200 ppm) and three tomato varieties (BARI tomato 7, Manik and Ratan). Plant height, number of leaves and number of branches, days required for first flower initiation, days required for 50% flowering, days required for fruit setting, fruit cluster plant-1, fruit plant-1, weight tomato-1, yield plant-1, yield plot-1 and yield hectare-1 were significant influenced by the combined application of IAA and varieties of tomato. BARI Tomato-7 had the highest fruit yield with 100 ppm IAA and the lowest yield was observed in Ratan with 0 ppm IAA. IAA treated plots showed better performance for growth parameters and yield compared to control condition and 100 ppm IAA was more suitable than the 200 ppm IAA for higher yield of tomato cultivation. Among the treatment combinations, BARI Tomato-7 with 100 ppm IAA was superior, Ratan with 0 ppm IAA was inferior and BARI Tomato-7 with 200 ppm IAA, Manik with 200 ppm IAA and Ratan with 200 ppm IAA treated plots showed the intermediate results for yield and yield components.
    06/2015; 8(1):139-145. DOI:10.3329/jesnr.v8i1.24687
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    • "According to Iqbal and Ashraf (2010) and Alqarawi et al. (2014b), salinity perturbs the hormonal balance of plants; therefore, hormonal homeostasis under salt stress might be one possible mechanism of phytohormone induced plant salt tolerance. The exogenous application of phytohormones such as gibberellins (Afzal et al., 2005), auxins (Egamberdieva, 2009), and cytokinins (Gül et al., 2000) mitigate salt stress and stimulate plant root and shoot growth under stress. The content of phytohormones in plants may also be affected by root-associated microorganisms (Turan et al., 2014). "
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    ABSTRACT: Abiotic stresses cause changes in the balance of phytohormones in plants and result in inhibited root growth and an increase in the susceptibility of plants to root rot disease. The aim of this work was to ascertain whether microbial indole-3-acetic acid (IAA) plays a role in the regulation of root growth and microbially mediated control of root rot of cotton caused by Fusarium solani. Seed germination and seedling growth were improved by both NaCl and Mg2SO4 (100 mM) solutions when treated with root-associated bacterial strains Pseudomonas putida R4 and P. chlororaphis R5, which are able to produce IAA. These bacterial strains were also able to reduce the infection rate of cotton root rot (from 70 to 39%) caused by F. solani under gnotobiotic conditions. The application of a low concentration of IAA (0.01 and 0.001 μg/ml) stimulated plant growth and reduced disease incidence caused by F. solani (from 70 to 41-56%, respectively). Shoot and root growth and dry matter increased significantly and disease incidence was reduced by bacterial inoculants in natural saline soil. These results suggest that bacterial IAA plays a major role in salt stress tolerance and may be involved in induced resistance against root rot disease of cotton.
    Saudi Journal of Biological Sciences 05/2015; 1. DOI:10.1016/j.sjbs.2015.04.019 · 1.26 Impact Factor
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