Science Campus

Kāraikkudi, India

Science Campus

Kāraikkudi, India
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Banu S.F.,SASTRA University | Rubini D.,SASTRA University | Rakshitaa S.,SASTRA University | Chandrasekar K.,Govind Ballabh Pant National Institute of Himalayan Environment and Sustainable Development | And 5 more authors.
Frontiers in Microbiology | Year: 2017

Pseudomonas aeruginosa is a nosocomial pathogen colonizing patients with chronic infectious diseases and has gained resistance to all the known broad spectrum antibiotics available today. The present study showcases the antibiofilm potential of an essential oil (EO) from an underexplored Cinnamomum species namely, C. tamala, against P. aeruginosa biofilms. Furthermore, the synergistic effects of the EO along with a commercially available DNase (DNaseI) and a DNase (MBD) isolated from a marine bacterium were explored for its antibiofilm activity. The results showed that the synergized action has maximum efficacy in inhibiting young and preformed biofilms. The synergized effect of EO and DNaseI showed 70% inhibition against matured biofilms of P. aeruginosa. The EO from C. tamala also showed quorum sensing inhibitory potential as it could inhibit the swarming motility behavior of P. aeruginosa. The synergistic action of EO and DNases offers a novel alternate therapeutic strategy for combating P. aeruginosa biofilm associated infections. © 2017 Farisa Banu, Rubini, Rakshitaa, Chandrasekar, Murugan, Wilson, Gowrishankar, Pandian and Nithyanand.


Satish L.,Science Campus | Rathinapriya P.,Science Campus | Rency A.S.,Science Campus | Ceasar S.A.,Entomology Research Institute | And 3 more authors.
Journal of Applied Phycology | Year: 2015

The effect of seaweed liquid extracts (SLEs) from Gracilaria edulis and Padina boergesenii was studied on finger millet bioassays. Finger millet seeds were germinated on 0–100 % of SLEs. Genotype ‘PR-202’ showed superior response with higher frequency of germination (99.6 %), fresh weight (1.1 mg seedling−1), shoot length (13.4 cm), root number (4.8), and root length (8.6 cm) with 60 % of G. edulis extract. Influence of SLEs and various phytohormones on somatic embryogenesis and regeneration of finger millet was studied. Shoot apical meristem was inoculated on Murashige and Skoog (MS) medium containing 3–5 mg L−1 2,4-dichlorophenoxyacetic acid (2,4-D) or 2,4,5-trichlorophenoxyacetic acid individually or in combination of 0.1–1.0 mg L−1 kinetin or 10–40 % each SLEs of G. edulis or P. boergesenii was used for callus induction and somatic embryogenesis. SLEs of each species were used individually at 20–60 % and 25–75 % for somatic embryogenesis and regeneration, respectively. The optimum levels of either SLE were found to be 20, 40, and 50 % for callus induction, somatic embryogenesis, and regeneration from somatic embryos, respectively. The MS medium containing 4.0 mg L−1 2,4-D and 0.5 mg L−1 kinetin produced 53.2 % somatic embryogenesis in genotype ‘PR-202’ where G. edulis extract improved the somatic embryogenesis to 66.6 %. Further, 40 % of SLEs emerged somatic embryogenesis 89.8 %, regeneration of embryogenic callus 96.3 %, and rooting of elongated shoots 97.4 %, respectively. Well-grown plantlets were acclimatized in the greenhouse with 94 % survival rate. RAPD profiles of in vitro regenerated and mother plants were similar and no somoclonal variation was detected. The current study confirmed that SLEs can be used for somatic embryogenesis and plant regeneration. © 2015 Springer Science+Business Media Dordrecht

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