Browsing by Author "Gopal Krishna Srivastava"

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A new subspecies of Isoetes coromandelina (Isoetaceae) from Gujarat, India
(College of Life Science, 2017) Santosh Kumar Shukla; Sarvesh Kumar Singh; Pradeep Kumar Shukla; Nawal Kishor Dubey; Husnara Khanam; Gopal Krishna Srivastava
In the present study Isoetes coromandelina ssp. thanensis S.K. Shukla, S.K. Singh, P.K. Shukla, N.K. Dubey, H. Khanam & G.K. Srivastava a micro endemic new subspecies is described from the Than in Rajkot District of Gujarat state in coastal zone of India. Morphologically, the new subspecies is most similar to I. coromandelina ssp. coromandelina but differs in its microspore with levigate surface ornamentation and chromosome number 2n = 22 + 1. Different morphological features of I. coromandelina ssp. thanensis are discussed. Images and a distributional map are also provided. In the present study, we made a correlation between microspore ornamentation and ploidal status at the infra-specific level which helpful in taxonomy of closely related taxa. © 2017, College of Life Science. All rights reserved.
Hydrochemical characterization of some stands of Isoetes Dixitei in India
(College of Life Science, 2015) Brij Bhan Yadav; Sarvesh Kumar Singh; Nawal Kishor Dubey; Santosh Kumar Shukla; Gopal Krishna Srivastava
In the present study soil, water and plant samples were collected from seven different natural populations of Isoetes dixitei which are found growing on the tablelands of Satara and Kolhapur districts of Maharashtra, India. The collected soil and water samples have been analysed for the colour, texture, available plant nutrients, electrical conductivity, pH and BOD. The soil and water factors along with biotic factors are compared with the number of plants per m2, length of plants, number of leaves and roots per plant to understand the morphological diversity and biology within different populations of I. dixitei. The results of present analysis reveals that these ecological factors such as organic carbon, iron, phosphorus and potassium in soil and low pH of soil and water have positive relationships with the growth, robustness and diversity of I. dixitei. However, copper, zinc and electrical conductivity in the soil have negative significant role in influencing the plant characters. The role of manganese appears to be not significant. The biological factors play major role in controlling the diversity (number of plants per m2) of this taxon. © 2015 College of Life Science. All rights reserved.
The microspore morphology of some species of Selaginella (Selaginellaceae) from India
(Taylor and Francis Inc., 2016) Sarvesh Kumar Singh; Nawal Kishor Dubey; Gopal Krishna Srivastava
The microspore morphology of 10 Indian species of Selaginella based on colour, laesura length, ornamentation and size was investigated using both light microscopy and scanning electron microscopy (SEM). The microspore ornamentation of some species and tetrad formation in mature microsporangia of S. ganguliana have been described for the first time. In addition, intraspecific variations in ornamentation patterns of microspores have been reported using SEM. These observations will be helpful in morphotaxonomy for accurate identification and cataloguing the basic data of selaginellaceous microspores, as well as systematics of the genus. © 2015 AASP - The Palynological Society.