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Diazotrophic bacilli isolated from the sunflower rhizosphere and the potential of Bacillus mycoides B38V as biofertiliser

The nitrogen fixation by strains belonging to the Bacillus genus remains poorly
explored. In this work, the diversity of endospore-forming bacilli isolated
from the rhizosphere of sunflower was evaluated. A total of 101 strains
were identified based on the V1-V2 variable regions of the 16S rRNA gene.
Strains belonging to the genera Bacillus and Paenibacillus represented 41.6% and
58.4%, respectively, of total isolates. The production of indolic compounds was
a common trait among the isolates, and approximately 75% of them exhibited
positive nitrogenase activity; but only 9.2% displayed activities higher than
1 nmol C2H4 mg protein h−1. Within the genus Bacillus, the isolates related
to the B. cereus group displayed the highest nitrogenase activity and were the
second most frequent group of Bacillus sp. isolated. Plants inoculated with the
isolate B38V showed the highest N content, and their shoot dry weights were
significantly increased compared with positive control. Our results indicated
that B38V, which belongs to the B. mycoides species, has the potential to
promote sunflower growth. The data obtained in this study provide additional
information concerning the diversity of Gram-positive diazotrophic within the
genera Bacillus and Paenibacillus and their potential for the biofertilisation of
sunflower crops.

Keywords: Bacillus; Paenibacillus; N2-fixing, sunflower rhizosphere; plant-growth promotion

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Informasi Detail
Judul Seri
Annals of Applied Biology
No. Panggil
-
Penerbit
New York : Association of Applied Biologists.,
Deskripsi Fisik
Ann Appl Biol 168 (2016) 93–110
Bahasa
English
ISBN/ISSN
0003-4746
Klasifikasi
-
Tipe Isi
-
Tipe Media
-
Tipe Pembawa
-
Edisi
168 (2016)
Subjek
BIOLOGI
Info Detail Spesifik
-
Pernyataan Tanggungjawab
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Tidak tersedia versi lain

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