scholarly journals Bioprospecting Beneficial Endophytic Bacterial Communities Associated With Rosmarinus Officinalis for Alleviating Plant Productivity

2021 ◽  
Author(s):  
Minakshi Sharma ◽  
Gaurav Sood ◽  
Anjali Chauhan
Keyword(s):  
Growth Parameters ◽  
Soil Health ◽  
Physical Growth ◽  
Western Himalayas ◽  
Pgp Traits ◽  
The North ◽  
Rdna Sequencing ◽  
Uninoculated Control ◽  
North Western

Abstract The present study was aimed to isolate and identify root endophytic bacteria with multifunctional plant growth promoting (PGP) traits from medicinal plant Rosemarinus officinalis grown in the North-Western Himalayas. A total of 42 strains were isolated, exhibiting variable degrees of PGP traits, including P-solubilization (10-375 µg/ml), IAA (6-66 µg/ml), siderophore (32.37-301.48 %SU) production and antifungal activity in terms of percent growth inhibition (%GI) against Fusarium oxysporum (44.44-77.77 %GI), Fusarium graminiarum (48.88-71.42 %GI) and Rhizoctonia solani (44.44-77.7 %GI). 16S rDNA sequencing results showed lineage of these strains to 15 genera viz., Aneurinibacillus, Bacillus, Beijerinckia, Cedecea, Ensifer, Enterobacter, Kosakonia, Lactobacillus, Lysobacter, Oxynema, Pseudomonas, Pantoea, Paenibacillus, Pseudoxanthomonas and Serratia. The effect of 11 potential strains was selected for in vivo growth studies of R. officinalis. The results showed that the inoculation of Bacillus subtilis KU21, Pseudomonas aeruginosa SI12, and Cedecea lapagei KU14 significantly increased the physical growth parameters of plant over uninoculated control viz., number of lateral of branches (43.95-46.39 %), stem height (29.04-38.57 %), root length (32.31-37.14 %), shoot (34.76-40.91 %) and root biomass (62.89-70.70 %). Physiological characteristics such as total chlorophyll (30.41-30.96 %), phenol (14.43-24.55 %) and carotenoids (34.26-39.87 %) content, also showed a relative increase as compared to uninoculated control; furthermore, the macronutrients (NPK) contents of the plant as well as soil also showed an increase. The developed module may be recommended for sustainable production of R. officinalis in the North-Western Himalayan region without hampering the soil health and fertility.

scholarly journals Fusarium wilt biocontrol and tomato growth stimulation, using endophytic bacteria naturally associated with Solanum sodomaeum and S. bonariense plants

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Rania Aydi-Ben-Abdallah ◽  
Hayfa Jabnoun-Khiareddine ◽  
Mejda Daami-Remadi
Keyword(s):  
Fusarium Wilt ◽  
Endophytic Bacteria ◽  
Biochemical Characterization ◽  
Growth Parameters ◽  
Disease Incidence ◽  
Main Body ◽  
Safe Alternative ◽  
Rdna Sequencing ◽  
Tomato Growth

Abstract Background Fusarium wilt biocontrol using endophytic microorganisms may represent a potentially attractive and environmentally safe alternative since endophytes could better limit disease incidence and severity through inhibition of the systemic fungus progress. Main body of the abstract Twenty-three endophytic bacterial isolates, naturally associated with Solanum sodomaeum and Solanum bonariense, were evaluated for their ability to control Fusarium wilt of tomato induced by Fusarium oxysporum f. sp. lycopersici (FOL) and to promote plant growth. Selected endophytic isolates were screened in vivo, using the root dipping and the culture substrate drenching methods. The most bioactive isolates were subjected to morphological and biochemical characterization and subsequent identification through 16S rDNA sequencing genes. Seven isolates (Stenotrophomonas maltophilia S23, S24, S26 and S28; Bacillus sp. SV81; Azotobacter chroococcum S11; and Serratia marcescens S14) were found to be the most efficient in reducing disease severity by 82–96% over control. Treatments with these isolates led to a significant enhancement in growth parameters, estimated at 45.5–61 and 24.2–70.5% than the control, in tomato plants infected or not with FOL, respectively. Diffusible and volatile metabolites released from bacterial cultures had significantly limited FOL radial growth. All isolates were positive for indole-3-acetic acid (IAA) production. S. marcescens S14, S. maltophilia S28, and Bacillus sp. SV81 exhibited a positive phosphate solubilization activity. Production of chitinase, protease, pectinase, and hydrogen cyanide were also investigated. Short conclusion This study clearly demonstrated that endophytic bacteria recovered from these 2 Solanum species can be explored as promising biocontrol agents active against FOL and are able to enhance tomato growth.

Two new taxa and one new record of Aquilegia (Ranunculaceae) from India and Pakistan

Phytotaxa ◽  
2020 ◽  
Vol 439 (2) ◽  
pp. 108-118
Author(s):  
ANDREY S. ERST ◽  
COLIN A. PENDRY ◽  
TATYANA V. ERST ◽  
HIROSHI IKEDA ◽  
KUNLI XIANG ◽  
...  
Keyword(s):  
New Species ◽  
New Taxa ◽  
New Record ◽  
Identification Key ◽  
Western Himalayas ◽  
Diagnostic Characters ◽  
The North ◽  
First Time ◽  
North Western ◽  
A New Species

A new species Aquilegia bashahrica and a new nothospecies Aquilegia × emodi from North-western Himalayas, are described and illustrated. In addition A. lactiflora is recorded for India and Pakistan for the first time and Aquilegia kareliniana is excluded from the flora of India. An identification key to the species of Aquilegia from the North-western Himalayas is provided and diagnostic characters are discussed.

Chemical Soil Quality Indicators in Relation to Topographic Positions in the North-Western Himalayas, India

2019 ◽  
Vol 7 (1) ◽  
pp. 39
Author(s):  
Vijay Singh Meena ◽  
Tilak Mondal ◽  
Suman Roy ◽  
Ram Prakash Yadav ◽  
Sanjay Kumar Arya ◽  
...  
Keyword(s):  
Soil Quality ◽  
Quality Indicators ◽  
Western Himalayas ◽  
Soil Quality Indicators ◽  
The North ◽  
Chemical Soil ◽  
Topographic Positions ◽  
North Western
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