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Journal of Agricultural Science and Technology، جلد ۱۴، شماره ۵، صفحات ۹۸۵-۹۹۴
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عنوان انگلیسی Enhanced Auxin Production by Azospirillum Pure Cultures from Plant Root Exudates
چکیده انگلیسی مقاله Bacteria of the genus Azospirillum are well known as plant growth promoting rhizobacteria. The ability to synthesize phytohormones is considered one of the most important mechanisms to promote plant growth and is widely distributed among plant-associated rhizobacteria.The most important phytohormone produced by Azospirillum is the auxin indole-3-acetic acid, with the L-tryptophan as the precursor. In the present study, we evaluate the capacity of eight Azospirillum strains isolated from rice and wheat, to produce in vitro auxins using plant exudates. Our results show that isolates produced auxins in tryptophan free media, but, generally, the amount produced increased when the tryptophan concentration increased. Some plants root exudates had a similar effect to tryptophan for the auxin production. In this sense, bean, rice and canola root extracts produced, respectively, 93.3%, 96.2%, and 88.31% more auxin than L-tryptophan. Azospirillum sp. isolate A3 had the maximal capacity to produce auxin. Therefore, the effect of cell free supernatant was studied on rice root development. Statistical analysis did not show any significant difference between root number and dry weight of the treated and control seedlings. However, significant differences were observed in root length and wet weight at α=0.01 and α=0.05, respectively.
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نویسندگان مقاله محمدجواد مهدی پور مقدم | m j mehdipour moghadam
department of biology, faculty of science, university of isfahan, isfahan, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه اصفهان (Isfahan university)

g امتیازی |
department of biology, faculty of science, university of isfahan, isfahan, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه اصفهان (Isfahan university)

z صالحی |
department of biology, faculty of science, university of guilan, rasht, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه گیلان (Guilan university)

نشانی اینترنتی http://jast.modares.ac.ir/article_4869_09e30438016fd624f1587b1fb32cb2d2.pdf
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