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Papers by Kripamoy Chakraborty

Journal of Mycopathological research

Zenodo (CERN European Organization for Nuclear Research), Dec 30, 2022

Plant Pathology & Quarantine Journal of Fungal Biology, Jul 22, 2016

Soil chemical properties, arbuscular mycorrhizal (AM) fungal colonization, AM fungal morphology i... more Soil chemical properties, arbuscular mycorrhizal (AM) fungal colonization, AM fungal morphology in root and diversity of AM fungi in rubber plantations of three different age groups of 5, 10 and 30 years old of Tripura, NorthEast India were investigated. The result exhibited positive correlation (p<0.05) between AM colonization and spore density with available nitrogen. There was a positive significant correlation between AM colonization with spore density. AM fungal colonization was significantly higher in 5 and 10 than 30 years old plantation. Arum type of AM fungal morphology was observed in the root. A total of 12 morphotypes were isolated belonging to the genera Acaulospora, Ambispora and Glomus. Out of which 5, 9 and 9 AM fungal species were isolated from the rubber plantations of 30, 10 and 5 years old, respectively. Shannon diversity index was highest in 5 years old and lowest in 30 years old plantation. Evenness was highest in 30 years old and lowest in 10 years old plantation. The relation of soil chemical properties with AM fungal colonization and AM fungal species composition is discussed.

Vegetos, 2022

Dioscorea species are dioecious, in which, the male and female plants produce their underground t... more Dioscorea species are dioecious, in which, the male and female plants produce their underground tubers. Dioscorea spp. is renowned for secondary metabolites production and widely used in the pharmaceutical industry and medicine. Dioscorea spp. capitulates fifty percent of the total steroid drugs worldwide. Enormous literature concerning the morphology, medicinal potentiality, secondary metabolite, and bioactivities of Dioscorea spp. are available without denoting the sexes of Dioscorea . This present study aims for sexual dimorphism analysis through micromorphology, secondary metabolite content, antioxidant, and antimicrobial activities analysis. Male and female mature tubers of Dioscorea species were collected from the forest floor of Tripura and used to assess secondary metabolite, antioxidant and antimicrobial activity. For the micromorphological study, mature tubers were planted in the experimental garden and observed micromorphological differences among the male and female plants of Dioscorea species. The results of this study exhibits substantial variation between male and female plants. The tubers of the female plants are superior in acquiring phytoconstituents and possess superior antimicrobial and antioxidant potentiality compared to their male counterparts. This study may provide an effective, influential contribution to the modern scientific communities concerning the extraction of the biologically active constituents from these dioecious tubers, which may untie a new horizon in the pharmaceutical industries.

Biological Sciences: Impacts on Modern Civilization, Current and Future Challenges, 2020

Vegetos, 2021

The current investigation was focused to enumerate seasonal population of phosphate solubilizing ... more The current investigation was focused to enumerate seasonal population of phosphate solubilizing bacteria (PSB) and to examine colonization of arbuscular mycorrhizal (AM) fungi associated with rubber trees from the plantations of Tripura, India. The study also aims to identify AM fungi and characterize PSB from the rhizosphere of rubber trees. The results indicated that AM fungal colonization and PSB population were higher during monsoon and significantly lower in winter. Significant correlation was observed between populations of PSB and AM fungal colonization. Phosphate solubilization index of PSB isolates was significantly exhibited highest by Bacillus tequilensis. Twenty seven AM morphotypes and five isolates of PSB were identified. The higher number of species recovered from the genus having the order Glomus > Rhizophagus > Claroideoglomus =Sclerocystis > Acaulospora = Funneliformis > Ambispora = Diversispora = Dentiscutata = Gigaspora = Redekera = Septoglomus. The ...

Science & Technology Journal, 2021

Invasive alien plants tend to grow much faster than non-invasive plants. The colonization by AM f... more Invasive alien plants tend to grow much faster than non-invasive plants. The colonization by AM fungi is confirmed by the presence of mycorrhizal structures in the roots of invasive plants. The pattern of hyphae and arbuscules denotes Arum and Paris type of AM fungal morphology. The most common and abundant invasive plants from Asteraceae family were selected for the study. Ageratum conyzoides, Mikania micrantha, Ageratum haustonianum and Bidens Pilosa were selected and eventually showed that they have a high percentage of mycorrhizal colonization. Arum type of morphology is found in three of the plant species and Paris type of morphology is found in one of the species. The extent of AM fungal colonization is fairly high ranging from 60% to 90% among the studied plants. The percentage of arbuscular colonization is highest in Bidens pilosa and the percentage of vesicle and hyphal colonization is highest in Ageratum conyzoides.

Future Journal of Pharmaceutical Sciences, 2020

Background The monocotyledonous herbaceous crop Dioscorea is native to tropical and temperate reg... more Background The monocotyledonous herbaceous crop Dioscorea is native to tropical and temperate regions of the world. Dioscorea tubers are dioecious in nature, have colossal therapeutic potentiality, and are frequently used in traditional medical practices throughout the world. Most of the research works are aimed to determine the medicinal property, nutritions, antinutrients, and biological activities of Dioscorea spp. without specifying the sexes of Dioscorea which promoted us to carry out this present research work. Results Sex-specific variation of phytoconstituents, antioxidants, and antimicrobial efficiency in tubers was appraised. The results obtained from this study divulge existence of significant quantitative variation between the male and female tubers. The female tubers are superior in acquiring phytochemicals compared to male counterparts and acquired maximum antioxidant and antimicrobial potentiality. Conclusion This study will offer an apposite baseline for further sex-...

Tropical Ecology, 2020

The present study aimed to assess the diversity of saprobic fungi associated with three decomposi... more The present study aimed to assess the diversity of saprobic fungi associated with three decompositional stages of Hevea brasiliensis (Wild. ex Juss.) Mull. Arg. leaves along a chronosequence of plantations. The modified surface disinfection culture method was followed for isolation of saprobic fungi from three different phases (G1, G2 and G3) of decomposing leaves. The result revealed 51 species of fungi isolated from three plantations. There was an increasing trend of number of species along a chronosequence of plantations. Cladosporium sp. was isolated from all the phases of decomposition from all the three plantations. There is an increasing trend in diversity and a decreasing trend in dominance of fungi along a chronosequence of plantations. Overall, higher number of species and maximum diversity was recorded in G2 (Hʹ = 3.61) among the decompositional phases. The study suggests increase in diversity along a chronosequence of plantations and the similarity index suggests distinct fungal occurrence pattern in the leaf litter along a chronosequence of plantations.

Journal of Applied Biology & Biotechnology, 2019

Plant Science Today, 2019

The present study was aimed to study monthly colonization of arbuscular mycorrhizal (AM) and dark... more The present study was aimed to study monthly colonization of arbuscular mycorrhizal (AM) and dark septate endophyte (DSE) fungal associations in rice. The presence of mycorrhizal structures in the roots confirms the colonization by AM fungi. The pattern of hyphae and arbuscules denotes Arum type of AM fungal morphology. The presence of dark coloured septate hyphae running frequently on the epidermal layer and in root cortex and the occurrence of microsclerotia marks the colonization by DSE fungi. The co-occurrence of both AM and DSE fungi ensure dual colonization by two distinct fungal groups. There was significant increase in arbuscules, vesicles and hyphal percentages from first to third month in both the samples collected from two sites. In the third month, AM colonization significantly higher in both the sites. DSE colonization percentages do not differ significantly in first to third month. A total of nine AM fungal species were recovered from two sites. This study is an effort...

The reform process initiated in the banking sector in the country has brought in the New Age priv... more The reform process initiated in the banking sector in the country has brought in the New Age private banks, which are quite aggressive in their operation. They are now playing a crucial role in attracting deposits from the customers, providing advances to various sections of society and thereby giving a tough competition to the public sector banks (PSBs) not only in terms of quantity, but also in terms of quality. The private sector banks have brought in many new products like credit cards, debit cards. ATMs, internet banking etc. The PSBs have been forced to extend these facilities, which they are struggling to do, since decision making takes time. Private sector banks have also extending facilities like share trading, commodity trading, saving and current accounts and term deposits with new features. This has led to the situation, where the customers now opine that the private sector banks are aggressive and more tech savvy in their operations in attracting customers and in providing more and newer products to them, while the PSBs are less efficient and not quite forthcoming in extending new facilities to their customers. However, there is also a general opinion that the public sector banks are more secured compared to the private sector banks, since the former are backed directly by the Government, which provides a lot of satisfaction to their customers. The PSBs score over the private sector banks on one count, while the later score over the former on another count. This calls for a close scrutiny from the view point of customers regarding their preferences for the saving and investment products provided by the banks that belong to the two sectors with the help of primary data, which is the basic thrust of the present study.

International Journal of Current Research in Biosciences and Plant Biology, 2016

Vegetos- An International Journal of Plant Research, 2014

Leguminous cover crops provide permanent soil cover, reduce erosion, increase soil nutrient level... more Leguminous cover crops provide permanent soil cover, reduce erosion, increase soil nutrient level and organic matter. More than 35 weed legumes are luxuriantly growing in different localities of Tripura. In the present paper carbon metabolites such as chlorophyll-a, b, total chlorophyll and carotenoid and various nitrogen metabolites (soluble protein, total protein and total free amino acid) in the leaves of four creeper weed legumes have been studied. As the levels of the various carbon and nitrogen metabolites were found in higher these weed plants can be used for tea garden, rubber plantation forests and agricultural fields to enrich soil nitrogen level.