Both isolated organisms identified as Rhizobium sps.and colonies obtained from rhizosphere soil
were screened for their ability to produce IAA. Colour reaction of various isolates of Rhizobia
with Salkowaski reagent resulted in the appearance of red colour All isolated rhizobia showed
red colour reaction with salkowaski reagent indicating their ability to produce IAA.
Out of 60 colonies selected from rhizosphere of groundnut, 40 colonies from rhizosphere of
groundnut and 22 colonies from rhizosphere of Lucerne showed red colour with Salkowaski
reagent on nylon 6’6’ membrane indicating production of IAA by the organisms. Salkowaski
reagent method was highly sensitive which can detect 50 pmoles of IAA. Among the rhizosphere
soil, dominant IAA producers were identified as Pseudomonas, Azotobacter and Bacillus sps.
Comparison between the isolated Rhizobia and their rhizosphere soil organisms for their ability
to produce IAA, it was observed that isolated Rhizobia from root nodules good producers of IAA
than the remaining organisms. (Fig 1)
Fig 1: Screening on Nylon 6’6’membrane From left to right RG, RH, RL,RT.
3.3
Both isolated organisms identified as Rhizobium sps.and colonies obtained from rhizosphere soil
were screened for their ability to produce IAA. Colour reaction of various isolates of Rhizobia
with Salkowaski reagent resulted in the appearance of red colour All isolated rhizobia showed
red colour reaction with salkowaski reagent indicating their ability to produce IAA.
Out of 60 colonies selected from rhizosphere of groundnut, 40 colonies from rhizosphere of
groundnut and 22 colonies from rhizosphere of Lucerne showed red colour with Salkowaski
reagent on nylon 6’6’ membrane indicating production of IAA by the organisms. Salkowaski
reagent method was highly sensitive which can detect 50 pmoles of IAA. Among the rhizosphere
soil, dominant IAA producers were identified as Pseudomonas, Azotobacter and Bacillus sps.
Comparison between the isolated Rhizobia and their rhizosphere soil organisms for their ability
to produce IAA, it was observed that isolated Rhizobia from root nodules good producers of IAA
than the remaining organisms. (Fig 1)
Fig 1: Screening on Nylon 6’6’membrane From left to right RG, RH, RL,RT.
3.3
การแปล กรุณารอสักครู่..
