Browsing by Author "Dalip Kumar Upreti"

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A geostatistical approach to compare metal accumulation pattern by lichens in plain and mountainous regions of northern and central India
(Springer Science and Business Media Deutschland GmbH, 2022) Rajesh Bajpai; Vertika Shukla; Ashwani Raju; Chandra Prakash Singh; Dalip Kumar Upreti
Based on the physicochemical characteristics, metals emitted from the source (both natural and anthropogenic) contributes towards spatial continuity at a regional scale. Apart from the intrinsic properties of metals, meteorological conditions and topography of the region are also known to contribute towards spatial continuity. In the present study, a comparative spatial assessment of 12 metals in lichen Phaeophyscia hispidula collected from mountains and plains of northern and north-central India was carried out with the help of the indicator kriging method. The total metal concentration varies between 25.4–429 µgg−1 and 22.8–507 µgg−1 dry weight in plains and mountains, respectively. The ‘Indicator Kriging’, a cokriging non-parametric approach has been applied to predict the total metal load (TML) probability from a regional lichen database derived from the different metals in the mountain and plain regions. Cr, Cd, Cu and Pb had higher concentrations having higher coverage area, while metals like Cd and Hg had the highest localized distribution indicating point sources. The probability values of TML are further related with topography, population density and land cover attributes to specific factors responsible for metal accumulation in the study area. Observations indicated that apart from local sources, topography, population density and land cover, also plays an essential role in the spatial behaviour of the metals, which has been verified by the bioaccumulation pattern of metals in lichen samples from the mountainous region. Among which three mountainous states of Northern India, Uttarakhand has a higher concentration of metals which may be attributed to the topography and local anthropogenic sources. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
A New Record of Canomaculina (Parmeliaceae, Ascomycota) from Western Himalaya, India
(Springer, 2019) Himanshu Rai; Sanjeeva Nayaka; Dalip Kumar Upreti; Rajan Kumar Gupta
The study hereby describes the occurrence of a new record of Parmelioid-lichenized fungi Canomaculina haitiensis (Hale) Elix from India. The species is described on nylon net house from western Himalaya. A revised key to the genus Canomaculina in India is provided incorporating the new record. © 2019, The National Academy of Sciences, India.
Lichen Colonization on Unusual Man-Made Substratum in Western Himalaya
(Springer, 2020) Himanshu Rai; Roshni Khare; Sugam Gupta; Dalip Kumar Upreti; Rajan Kumar Gupta; Bhaskar Charan Behera; Pradeep Kumar Sharma
The lichens along with their natural substratum colonize a variety of man-made substratum. After about half a century of lichenological research in India, there has been no record of lichen colonization on the man-made artificial substratum. The authors here for the first time report colonization of five species of lichens on three samples from two unusual habitats—iron railway sleepers—Heterodermia galactophylla (Tuck.) W.L. Culb. and abandoned woolen socks—Xanthoparmelia bellatula (Kurok. & Filson) Elix & J. Johnst., Physcia gomukhensis D.D. Awasthi & S.R. Singh, Xanthoparmelia congensis (J. Steiner) Hale and Xanthoria candelaria (L.) Th. Fr. in western Himalaya. Two supplementary tables (S1 and S2) are provided, giving details of collection sites and lichen species identified in each sample. The study revealed the extended geographical distribution of the two lichen species, i.e., Heterodermia galactophylla (Tuck.) W.L. Culb and Physcia gomukhensis D.D. Awasthi & S.R. Singh, highlighting the importance of such studies of unusual habitats in lichen diversity and preparation of their inventories. © 2020, The National Academy of Sciences, India.
The Role of Ultraviolet Radiation in Regulating Certain Physiological and Biochemical Processes in the Lichens Xanthoria candelaria (L.) Th.Fr. and Xanthoria elegans (L.) Th.Fr
(Springer, 2025) Amit Gupta; Ashish P. Singh; Prashant R. Singh; Dalip Kumar Upreti; Rajeshwar Prasad Sinha
The Earth continually receives natural sunlight consisting of photosynthetically active radiation (PAR) and ultraviolet radiation (UVR) emitted from the Sun, which strongly impacts lichens. UVR tolerance in lichens has rarely been explored. Therefore, this current study sought to evaluate the physiological and biochemical effects of UVR in the epiphytic lichens Xanthoria candelaria and Xanthoria elegans. There was a significant rise in parietin content when subjected to PAR + UV-A + UV-B (PAB) irradiations. The lichens’ thalli exposed to PAB radiation substantially reduced photosynthetic performance and chlorophyll (Chl) concentration. In X. candelaria (thalli having less parietin content), UVR had a detrimental impact on the amount of photosynthetic pigment and Chl fluorescence. Thus, it was concluded that in X. elegans, the layer of parietin functions as a natural barrier, which reduces UVR exposure to algal cells. Furthermore, the ergosterol content decreased, and the thiobarbituric acid-reactive substances content increased. These findings suggest that a major contributing component of UVR-induced cell membrane damage is the generation of reactive oxygen species (ROS). Lichens develop robust antioxidant defences against ROS-induced oxidative stress, comprising several antioxidant substances such as carotenoids and enzymes, including catalase, peroxidase, superoxide dismutase, and ascorbate peroxidase. Based on the findings of this research, we can conclude that parietin might be essential for the sustainable existence of the studied lichens under harsh environmental conditions, including intense solar irradiance. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.