isolation and characterization of microorganisms involved and used as biopesticides
#1

i would like to get details on isolation and characterization of microorganisms involved and used as biopesticides .i need help
Reply
#2

The most widely used pesticides utilized for the management of plant-parasitic nematodes
belong to the organophosphorus group. Their efficacy may be reduced in areas where adapted
microorganisms accumulate that are capable of rapidly degrading the active ingredients. The
enhanced biodegradation process of non-fumigant nematicides is of particular concern in
intensive agriculture. However, it remains unclear which microorganisms play the most
important role in the rapid metabolization and how and why this process develops.
Furthermore little is known as to whether the biodegradation process may be slowed down,
stopped or reversed. Studies using soils with different nematicide history collected in four
banana fields in the Atlantic region of Costa Rica demonstrated that the non-fumigant
organophosphate nematicide terbufos had lower levels of efficacy and shorter effective
activity against the burrowing nematode Radopholus similis when the soil had a prolonged
terbufos application history. Lower levels of efficacy were related to the microorganisms
capable of rapidly degrading the active ingredient. The analysis of soils collected in Germany
with different nematicide application history demonstrated that fenamiphos, another
organophosphate non-fumigant nematicide, was not rapidly biodegraded in soil with no
previous pesticide exposure. This study also demonstrated that Pseudomonas spp. does not
accumulate upon fenamiphos applications and may not be involved at all in fenamiphos
degradation. The lack of surfactant production of the isolated Pseudomonas spp. could be a
reason for their absence in the biodegradation process. Bacteria capable of degrading
fenamiphos were isolated from another German soil with a large fenamiphos-history. These
bacteria utilized fenamiphos as a sole carbon source. By comparison of the partial sequences
of their 16S rRNA coding genes with those genes present in the GenBank sequence database,
a fully resolved phylogenetic tree could be generated, showing that these fenamiphos
degrading (Fd) isolates belonged to closely related Microbacterium, Sinorhizobium,
Brevundimonas, Ralstonia, or Cupriavidus species. The Fd bacteria did not cross-degrade the
novel organophosphate nematicide fosthiazate, thus suggesting that they are fenamiphosspecific.
However, a combination of all microorganisms of the same soil from which the
fenamiphos-degrading bacteria was isolated, was capable of degrading fosthiazate, thus
demonstrating that there are other microorganisms capable of degrading nematicides even in
the absence of an application history. This also revealed that the nematicide-history of one
organophosphate nematicide does not intrinsically influence the degradation of another
pesticide of this same chemical group.
The application of plant revitalizers enhanced soil microbial biomass over time which
resulted in an enhanced biocontrol activity against the root-knot nematode Meloidogyne
incognita and a delayed biodegradation process of fenamiphos.
In conclusion, this research demonstrated that many different soil bacteria can adapt when
frequently exposed to a particular nematicide, thus offering them an alternative carbon source
to grow. This effect can be slowed down by altering the microbial soil diversity through the
application of natural plant enhancers that benefit nematicide non-degrading strains and
simultaneously reduce nematode damage.
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: biopesticides production seminar, types of industrially important microorganisms ppt, ppt on microorganisms friends and foes, microbial biopesticides seminar, student involved assessment for learning, microorganisms ks3, free seminar reports and ppt download on base isolation of civil engg,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  fayol principle used in apollo 1 752 18-08-2018, 07:00 AM
Last Post: Guest
  fayol principle used in apollo 0 693 18-08-2018, 06:54 AM
Last Post: Guest
  study of effect of antibiotics on microorganisms investigatory project pdf 2 2,445 17-08-2018, 07:53 PM
Last Post: Guest
  which principle of fayol are used in himalaya company 0 755 02-07-2018, 10:46 PM
Last Post: Guest
  final seminar report on base isolation 0 606 27-05-2018, 09:24 AM
Last Post: Guest
  algorithm used in skinput technology 0 395 21-03-2018, 10:26 AM
Last Post: Guest
  collection of all types documents used in the banks and office 1 864 26-12-2017, 09:11 AM
Last Post: jaseela123d
  download pdf on effect of antibiotics on microorganisms 1 1,253 25-09-2017, 10:19 AM
Last Post: jaseela123d
  font used in marksheets of pune university 1 1,147 25-07-2017, 12:28 PM
Last Post: jaseela123d
  wasted plastic fuel used in petrol engine seminar report and ppt download 1 709 05-07-2017, 03:16 PM
Last Post: jaseela123d

Forum Jump: