scholarly journals The Legume Root Nodule: From Symbiotic Nitrogen Fixation to Senescence

Senescence ◽  
10.5772/34438 ◽  
2012 ◽  
Author(s):  
Laurence Dupont ◽  
Genevive Alloing ◽  
Olivier Pierre ◽  
Sarra El ◽  
Julie Hopkins ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Root Nodule ◽  
Symbiotic Nitrogen Fixation

Symbiotic nitrogen fixation efficiency of mutant strains of lentil (Lens esculenta)Rhizobiumgrowing from pH 4·5 to 7·5

1982 ◽  
Vol 98 (3) ◽  
pp. 487-492 ◽  
Author(s):  
R. Rai ◽  
V. Prasad ◽  
T. N. Prasad ◽  
S. B. Kumar ◽  
B. S. Srivastava
Keyword(s):  
Nitrogen Fixation ◽  
Root Nodule ◽  
Symbiotic Nitrogen Fixation ◽  
Calcareous Soils ◽  
N Fixation ◽  
Lens Esculenta ◽  
Mutant Strains ◽  
Ph Range

SUMMARYA strain ofRhizobiumisolated from the root nodule of lentil was caused to produce mutants and screened on a medium of pH 4·5. Five mutant colonies ofRhizobiumwere isolated from lentil which differed in growth over a pH range 4·5–7·5. Strains differed in their growth in acidic and calcareous soils and also in their effectiveness of N fixation.

scholarly journals The Biological fertilizer research results of Seabuckthorn (Hippophae rhamnoides)

2021 ◽  
Vol 31 (3) ◽  
pp. 116-119
Author(s):  
Galt Lantuu ◽  
Ninj Badam ◽  
Ankhtuya Mijidorj
Keyword(s):  
Nitrogen Fixation ◽  
Root Nodule ◽  
Symbiotic Nitrogen Fixation ◽  
Nitrogenase Activity ◽  
Root Nodules ◽  
Hippophae Rhamnoides ◽  
Fresh Weight ◽  
Hippophaë Rhamnoides ◽  
Air Temperatures ◽  
Biological Fertilizer

The seabuckthorn subspecies mongolica used in this research. Seabuckthorn (Нippophae ramnoides L.) root nodule research focused on symbiotic nitrogen fixation bacteria that could aid in the cultivation of this species. Seabuckthorn root nodules have Frankia actinorhizal microorganisms.Under nitrogen-free conditions, seabuckthorn seedlings inoculated with a homogenate of root nodules that grew normally and the fresh weight of root nodules had positively correlated with plant growth. In the field, nitrogenase activity in root nodules was high in the period from June to September,when air temperatures were high and photosynthesis was active. Also we investigated the effect of nitrate on nitrogenase activity in seabuckthorn root nodules. Root nodules with many lobes were found in mature seabuckthorn trees grown in the field. Чацаргана (Hippophae Rhamnoides) тарьсан талбайд биологийн бордоо хэрэглэсэн дүнгээс Чацарганы (Hippophae rhamnoides) үндэсний булцуунаас азот шингээгч бактерийг ялган өсгөвөрлөх, шингээх идэвхи нь өөрчлөгдөж буй эсэхийг лабораторийн нөхцөлд турших, биобордоо бэлтгэж чацарганы тарьц суулгацыг бордож туршин үр дүнг хяналтын ургамалтай харьцуулж гаргахад  VI,VII,VIII сард өссөн үзүүлэлттэй буюу 3,74-7,1 х 106 бактерийн  эсээр нэмэгдсэн байна.  Түлхүүр үг:  Булцуу, биологийн бордоо, эрдэс бордоо,бичил биетэн

scholarly journals Plasmids Related to the Symbiotic Nitrogen Fixation Are Not Only Cooperated Functionally but Also May Have Evolved over a Time Span in Family Rhizobiaceae

2020 ◽  
Vol 12 (11) ◽  
pp. 2002-2014
Author(s):  
Ling-Ling Yang ◽  
Zhao Jiang ◽  
Yan Li ◽  
En-Tao Wang ◽  
Xiao-Yang Zhi
Keyword(s):  
Nitrogen Fixation ◽  
Gene Transfer ◽  
Horizontal Gene Transfer ◽  
Symbiotic Nitrogen Fixation ◽  
Gene Families ◽  
Time Span ◽  
Soil Conditions ◽  
Gene Gain ◽  
Nitrogen Fixing ◽  
Pan Genome

Abstract Rhizobia are soil bacteria capable of forming symbiotic nitrogen-fixing nodules associated with leguminous plants. In fast-growing legume-nodulating rhizobia, such as the species in the family Rhizobiaceae, the symbiotic plasmid is the main genetic basis for nitrogen-fixing symbiosis, and is susceptible to horizontal gene transfer. To further understand the symbioses evolution in Rhizobiaceae, we analyzed the pan-genome of this family based on 92 genomes of type/reference strains and reconstructed its phylogeny using a phylogenomics approach. Intriguingly, although the genetic expansion that occurred in chromosomal regions was the main reason for the high proportion of low-frequency flexible gene families in the pan-genome, gene gain events associated with accessory plasmids introduced more genes into the genomes of nitrogen-fixing species. For symbiotic plasmids, although horizontal gene transfer frequently occurred, transfer may be impeded by, such as, the host’s physical isolation and soil conditions, even among phylogenetically close species. During coevolution with leguminous hosts, the plasmid system, including accessory and symbiotic plasmids, may have evolved over a time span, and provided rhizobial species with the ability to adapt to various environmental conditions and helped them achieve nitrogen fixation. These findings provide new insights into the phylogeny of Rhizobiaceae and advance our understanding of the evolution of symbiotic nitrogen fixation.

scholarly journals Antioxidation and symbiotic nitrogen fixation function of prxA gene in Mesorhizobium huakuii

2019 ◽  
Vol 8 (10) ◽  
Author(s):  
Sanjiao Wang ◽  
Tiantian Lu ◽  
Qiang Xue ◽  
Ke Xu ◽  
Guojun Cheng
Keyword(s):  
Nitrogen Fixation ◽  
Symbiotic Nitrogen Fixation ◽  
Mesorhizobium Huakuii

scholarly journals Influence of PRE-emergence herbicides on soybean development, root nodulation and symbiotic nitrogen fixation

2021 ◽  
Vol 144 ◽  
pp. 105576
Author(s):  
Victor Hugo Vidal Ribeiro ◽  
Lucas Gontijo Silva Maia ◽  
Nicholas John Arneson ◽  
Maxwel Coura Oliveira ◽  
Harry Wood Read ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Symbiotic Nitrogen Fixation ◽  
Root Nodulation
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