POPULASI BAKTERI PENAMBAT NITROGEN SIMBIOTIK PADA RIZOSFER BEBERAPA VEGETASI PIONIR DI LAHAN BEKAS ERUPSI GUNUNG API MERAPI
Land affected by Merapi volcano eruption was occupaid by pioneer vegetations, such as Leguminosae. Rhizosphere effect of these vegetations on Rhizobium population was not known yet. The purposes this research was to know Rhizobium populations in the rhizosphere of vegetation in areas affected by Mer...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/132684/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=73225 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Land affected by Merapi volcano eruption was occupaid by pioneer
vegetations, such as Leguminosae. Rhizosphere effect of these vegetations on
Rhizobium population was not known yet. The purposes this research was to
know Rhizobium populations in the rhizosphere of vegetation in areas affected by
Merapi volcano eruption.
This research was conducted in Kaliadem and Kalitengah Lor. Samples
were taken from the rhizosphere of vegetations (Trema orientalis, A. decurrens,
Pennisetum purpureum, dan Ptridophyta) and soil without vegetation, each with
3 replications. Variable vegetation observed were amount and effectiveness of
root nodules. Nitrogen-fixing bacteria population was counted by the Plate count
method. The coloni were isolated, identified and tested for the ability of root
nodule formation in Acacia decurrens seedlings. The analysis used was
quantitative descriptive analysis.
The greatest effective number and nodules were found in Trema orientalis
(25.6 nodules/plant, 83.68%) followed by A. decurrens (12 nodules/plant,
75.04%) growing in Kaliadem area. In Kalitengah Lor area, root nodules were
found in A. decurrens (10.3 nodules/plant, 46.46%). The mean number of
Rhizobium in the rhizosphere of vegetation in Kalitengah Lor was 3.23 x 106
CFU/g and without vegetation 2.44 x 106 CFU/g. The mean number of Rhizobium
cell in the rhizosphere in Kaliadem was 1.91 x 106 CFU/g and no vegetation was
1.27 x 105 CFU/g. Isolation has obtained 24 isolates. Rhizobium isolates (6
isolates) formed spherical colonies, convex, white to milky white in color, and
have a short rod cell morphology and gram negative. Root nodule formation
experiment in A. decurrens seedlings found that the isolates did not form root
nodule. |
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