Effects of Plant Growth Promoting Rhizobacteria on Seed Germination and Growth of Bromus Tomentellus, Onobrychis sativa and Avena sativa in Drought Stress

Delshadi, Somaye (2015) Effects of Plant Growth Promoting Rhizobacteria on Seed Germination and Growth of Bromus Tomentellus, Onobrychis sativa and Avena sativa in Drought Stress. Masters thesis, University of Zabol.

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The study was conducted to identify the effects of bacterial bio-fertilizers on quantitative and qualitative characteristics of three species Bromus Tomentellus, Onobrychis sativa and Avena sativa under drought stress. The experimental design was factorial in a completely randomized design under greenhouse condition (University of Zabol). The treatments were comprised the following levels: Azote barvar1, Phosphorus barvar2, combination of Azote barvar1 and Phosphorus barvar2 and control. Water stress was applied at three levels of field capacity, 0.7 field capacity and 0.4 field capacity, with three replications. Quantitative parameters such as germination rate, germination percentage, root and shoot dry weight, root and shoot height, photosynthesis pigments (chlorophyll a, chlorophyll b, total chlorophyll and carotenoids), percentage of macro and micro-nutrients in the plant were measured. Results showed that impact of bio-fertilizer and interaction between different levels of drought stress were significantly difference with the exception of germination percentage B. Tomentellus, the roots of O. sativa and Mg in A. sativa (P≥0.01).Results revealed that bio-fertilizer Barvar 1 increased, germination rate, shoot length, potassium, magnesium, iron, manganese and zinc in A. sativa, However, dry weight of shoots and roots, chlorophyll and phosphorus decreased Data obtained for B. tomentellus showed that bio-fertilizer Barvar 1 increased germination rate, fresh weight of shoot, dry weight of roots, potassium, zinc and manganese. The fertilizer increased the germination percentage of O. sativa root length, potassium, magnesium, zinc, iron however, it depresed shoot's fresh weight, iron in the shoot and potassium in the roots. Phosphorus barvar2 increased the germination rate and percentage of B. Tomentellus and O. sativa, the fertilizer produced the high amount of nitrogen and phosphorus in B. Tomentellus and A. sativa and, dry and fresh weight of shoots of A. sativa. The combined application of bio-fertilizers increased photosynthesis pigments in A. sativa. In addition, there were an increase in fresh and dry weight of the shoot and root in O. sativa, and reduction in elements such as phosphorus, manganese and iron. Data obtained for the drought stress showed that 0.7FC increased the study characteristics of A. sativa and O. sativa while, 0.4FC decreased plants yield and amount of micro and macro nutrients In B .Tomentellus, FC level increased germination rate, shoot and root length, shoot fresh weight, nitrogen, phosphorus, magnesium and iron. While, photosynthesis pigments and some elements also led to decline. In this species, 0.7FC and 0.4FC had the highest effect on plant nutrients respectively. In general, Results of the study showed that use of bio-fertilizers 1 and 2 could increase the germination and growth of the plants. Also, according to these results, it seems that the fertilizers had positive impacts on the plants in 0.7FC and FC conditions and, they have no significant role to mitigating the effects of drought. The results of the study showed that application of bio-fertilizers on B. Tomentellus, O. sativa and A. sativa could be useful for restoration and improvement of rangelands.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Growth Promoter, Drought Stress, Seed Germination, Bio Fertilizers
Subjects: S Agriculture > SB Plant culture
Depositing User: admin admin1 admin2
Date Deposited: 15 Jun 2016 06:38
Last Modified: 15 Jun 2016 06:38
URI: http://eprints.uoz.ac.ir/id/eprint/767

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