Central Tuber Crops Research Institute

About: Central Tuber Crops Research Institute is a facility organization based out in Thiruvananthapuram, Kerala, India. It is known for research contribution in the topics: Starch & Fermentation. The organization has 475 authors who have published 587 publications receiving 10285 citations.

Microbial Diversity in Rhizosphere Soils of Tropical Tuber Crops: Utilization for Pathogen Suppression and Growth Promotion

Abstract: Tuber crops are the third most important food crops, after cereals and legumes There are many pathogenic microbes, which affect the production of tuber crops Fungal and viral pathogens attack most of the tuber crops However, there is much variability among the crops in their susceptibility to pathogens Similarly, rhizosphere soil has a large diversity of the microbial community, which possesses plant growth-promoting activity as well as pathogen suppression In the present study, the culturable microorganisms (fungi, bacteria and actinomycetes), in the rhizosphere of sixteen varieties of tropical tuber crops viz , sweet potato, elephant foot yam, cassava and yam were enumerated and compared; their role on suppression of Sclerotium rolfsii, the pathogen that causes collar rot in elephant foot yam was studied, and the ability of the organisms for growth promotion, nitrogen fixation, P and K solubilization was assessed, and the efficient antagonistic organisms were characterized by amplifying 16S rRNA The microbial population varied significantly among the crops and varieties Among one hundered and fifty organisms isolated and screened for pathogen suppression, ten bacterial and twelve actinomycete isolates completely inhibited the mycelial growth in the preliminary round of screening Eight bacterial isolates chosen for further study based on consistency in pathogen suppression, exhibited IAA production while seven isolates showed nitrogen fixation None of the bacterial isolates showed the formation of P or K solubilization zones in the selective media Molecular studies based on 16S rRNA gene sequencing revealed that the most efficient antagonistic bacterial isolates with growth promotion potential were Bacillus spp The six Bacillus species identified were Bacillus siamensis , B amyloliquefaciens , B pumilus , B halotolerans , B subtilis and B altitudinis Six out of eight efficient bacterial isolates were obtained from rhizosphere soils of sweet potato The organisms, Bamyloliquefaciens and Bsubtilis can serve as excellent bio-agents for pathogen suppression and growth promotion in tuber crops ecosystem

Asynapsis in cassava.

Abstract: A completely male sterile clone was identified in the germplasm and detailed meiosis showed it to be asynaptic. At pachytene all the chromosomes remained as univalents without any semblance to pairing. MI aslo showed 36 univalents in 97% of pollen mother cells. The bivalent like association in MI was as low as 0.03 per cell but the absence of pairing at pachytene and the lack of well defined x'mata suggested that they were only univalents lying closely together due to factors other than true pairing. The later stages were not well defined and univalents were noticed to divide. The scattering of chromosomes and irregular groupings resulted in polyads consequently all the pollen were sterile. The type of asynapsis noticed was ‘complete’. The presence of pollen sterility in all the plants of Ce-258 throughout the season ruled out environmental factors and suggested it was of genic nature.

Kinetics of Soil Carbon Mineralization Under Continuous Site-Specific Nutrient Management in Ultisols Under Cassava

Abstract: The present study focused on the effect of 10 years of continuous fertilizer trials on soil organic carbon (SOC) mineralization in cassava grown ultisols. The study determines the carbon (C) minera...

Eugenol significantly affects the flow of its nanodroplet gel.

Abstract: Introduction: Development of novel biomaterials for drug delivery which forms a part of the so called novel drug delivery systems has always been exhilarating. Mechanical evaluation of polymer based topical gels, which would be subjected to load or stress during its application, is inevitable. Methods: Rheological characterization was done by studying viscosity and yielding. Rheological modeling was also carried out. Results: The viscosity and yield stress were inversely dependent on the eugenol concentration. The gels followed Herschel–Bulkley and Bingham rheological models. Conclusion: Nanodroplets are colloidal systems and the microstructural changes in the Carbopol based nanodroplet gels were unveiled using rheometry.