خودبوم‌شناسی و هم‌بوم‌شناسی سودوموناس فلورسنس CHAO- Rif بکاررفته در کشت گیاهان آفتابگردان و شاهدانه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد گروه خاکشناسی، دانشکده کشاورزی، دانشگاه بوعلی سینا

2 دانش آموخته کارشناسی ارشد، دانشگاه بوعلی سینا

چکیده

گیاهان برای زندگی در زیستگاه‌های سخت مانند خاک‌های آلوده به فلزهای سنگین با دشواری‌های گوناگونی روبرو هستند که برای کاهش این دشواری بهره‌گیری از باکتری‌های افزاینده رشد گیاه می‌تواند سودمند باشد.این پژوهش برای بررسی اوتکولوژی و سین­اکولوژی باکتری سودوموناس فلوروسنس در یک خاک آلوده به فلزهای سنگین انجام شد. این پژوهش به گونه آزمایشی فاکتوریل با طرح کاملاً تصادفی در سه تکرار به گونه گلخانه­ای انجام شد. فاکتور نخست دو گیاه آفتاب­گردان و شاهدانه و فاکتور دوم خاک به دو گونه سترون و ناسترون بود که دانه آنها با باکتری سودوموناس فلوروسنس سویه CHAO- Rif که از موسسه بیمارهای گیاهی و بیولوژی سوئیس خریداری شده، مایه‌زنی شد. پس از رسیدن به گام گلدهی، کار برداشت گیاه انجام شد. فراوانی سودوموناس بکاررفته در خاک و گیاه در کشت آفتابگردان و خاک سترون بیش از 5/1 برابر و به اندازه چشم‌گیری بیشتر از آن در کشت شاهدانه و خاک ناسترون بود. در خاک سترون باکتری سودوموناس مایه‌زنی شده در بافت­های درونی ریشه آفتاب‌گردان و به گونه درونزی یا اندوفیت دیده شد و لگاریتم فراوانی آن 06/0±02/4 بود؛ ولی در درون ریشه شاهدانه یافت نشد. این باکتری بر رویه ریشه به گونه پلانوسفری و در خاک­های ریزوسفری و ناریزوسفری هر دو گیاه بازیابی شد ولی در درون اندام‌های هوایی هیچ یک از گیاهان به گونه درونزی دیده نشد. در برابر آن در خاک ناسترون باکتری یاد شده تنها در ریزوسفر و رویه ریشه (پلانوسفر) گیاهان دیده شد، ولی در درون ساقه و ریشه گیاهان به گونه درونزی و در خاک ناریزوسفری آنها دیده نشد. اگر چه ریزجانداران بومی خاک مایه کاهش فراوانی سودموناس بکاررفته در خاک ناسترون شد، ولی کاربرد این باکتری بر فراوانی دیگر ریزجانداران بومی پیامد بد و چشم‌گیری نداشت.

کلیدواژه‌ها


عنوان مقاله [English]

Autecology and synecology of Pseudomonas fluorescens CHAO-Rif used in the cultivation of sunflower and cannabis

نویسندگان [English]

  • A. A. Safari Sinegani 1
  • L. Ramezani 2
1 Professor, Soil Science Department, Bu Ali Sina University
2 M. Sc. Graduated, Bu Ali Sina University
چکیده [English]

Plants have difficulty living in hard habitats such as heavy metal contaminated soils that the application of plant growth-promoting bacteria can be beneficial to reduce this difficulty. This study was designed to investigate the autecology and synecology of Pseudomonas fluorescens CHAO-Rif in a heavy metal contaminated soil. This research was a factorial experiment with a completely randomized design with three replications in greenhouse condition. The first factor was plant species (sunflower and hemp plants) and the second factor was soil sterilization, in which the treated soils were inoculated with Pseudomonas fluorescens CHAO-Rif bacterium purchased from the Plant Pathology Group of the Institute for Integrative Biology (IBZ) in Zurich, Switzerland. The plants were harvested at the beginning of the flowering stage. The population of the applied Pseudomonas was significantly higher (more than 1.5 times) in sterile soil planted with sunflower compared to that in unsterile soil planted with cannabis. In sterile soil, the inoculated Pseudomonas could colonize in the inner tissues of the sunflower root. Here the natural log of the number of the bacterium was 4.02±0.06, but it was not found in the cannabis root. The bacterium was found in the rhizosphere and non-rhizosphere soils and on the root surface (rhizoplane) of both plants. However, it was not found in aerial parts of the plants. In unsterile soil, the inoculated bacteria were found only in the rhizosphere and on the root surface of the plants, but not seen in the shoots and roots of the plants. Although soil native microorganisms reduced the abundance of applied Pseudomonas in unsterile soil, the application of this bacterium did not have a significant negative effect on the studied soil native microorganisms.

کلیدواژه‌ها [English]

  • Biofertilizer
  • Endophyte
  • Plant growth-promoting rhizobacteria
  • Rhizosphere
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