The Effect of Plant Growth Promoting Rhizobacteria (PGPR), Salicylic Acid and Drought Stress on Growth Indices, the Chlorophyll and Essential Oil of Hyssop (Hyssopus officinalis)

Parisa Sharifi

Department of Agronomy, Faculty of Agriculture, Urmia University, Iran.

Corresponding Author E-mail: mahdiseyedsalehi1986@gmail.com

DOI : http://dx.doi.org/10.13005/bbra/2538

ABSTRACT: The side effects of chemical drugs and the human tendency to make greater use of natural products in order to keep their health as well as problems of modern medical system caused more attention of human to medicinal plants. Hyssop (Hyssopus officinalis) is a plant of the family Lamiaceae and is one of the most important medicinal plants containing essential oils. Despite of the other crops, medicinal plants are the plants that quality of materials compared to their quantity is much more important and necessary. Today using symbiotic microorganisms with plants as the bio-fertilizer for providing nutrients is considered. Among plant growth promoting rhizobacteria, Azospirillum, Pseudomonas and Bacillus can be pointed out. It was observed that using the bio-fertilizer Nitroxin and phosphate solubilizing bacteria on Chamomile increased vegetative yield, seed yield and essential oil yield. In order to study the effect of PGPR, salicylic acid and drought stress on growth indices, the chlorophyll and essential oil of hyssop,a factorial based on a completely randomized design with three replications was conducted at the research greenhouse, Faculty of Agriculture, … University, during 2013- 2014. Treatments were drought stress, salicylic acid and PGPR. Results showed that drought stress reduced the growth and physiologic characteristics and increased essential oil percentand accordingly Hyssop essential oil yield increased. Also, salicylic acid caused the increase in the yield, physiologic and essential oil traits and avoided stress injuries and compensateddecrease in growth traits. Growth promoting bacteria by producing some metabolites such as growth regulators, or types of vitamins as well as improved access to nutrients were directly increase plant growthand development. Among used bacteria, Azospirillum had the greatest impact on improving the measured traits.

KEYWORDS: Chlorophyll;Drought stress;Essential oil Growth indices; Hyssop; Medicinal plant; PGPR; Salicylic acid;

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