
Aditya Narayan Purohit

Aditya Narayan Purohit (born 30th July 1940) is an Indian scientist and professor who has mainly worked on ecophysiology of tree species and physiology of high altitude medicinal plants. He was born in village Kimni, Dist. Chamoli.
He has served as the Vice-Chancellor of Hemwati Nandan Bahuguna Garhwal University and as director of the university's High Altitude Plant Physiology Research Center.
He was also the Director of Govind Ballabh Pant Institute of Himalayan Environment and Development from 1990 to 1995.
Purohit was awarded Padma Shri, the fourth highest civilian award of India, by the President of India in 1997 for his valuable scientific contribution in Indian mountains.
Personal life.
Purohit was born in Kimni, Chamoli district, Uttarakhand, India.
He had his early education in Tharali and Rudraprayag in Chamoli district, Lansdowne in Pauri district, Nainital and research studies in Panjab University Chandigarh.
He worked at Forest Research Institute Dehradun, Panjab University Chandigarh, Central Potato Research Institute, Shimla, the University of British Columbia and North Eastern Hill University, Shillong before joining H.N.B. Garhwal University in 1977.
He has travelled all over the world to deliver lecturers and seminars in various conferences. He is married to Malti Purohit; they have a daughter and a son.
After joining HNB Garhwal University, Purohit initiated work on high altitude plants. He established an institute with its alpine field station at 13000-ft elevation at Tungnath, which is the "first Alpine Center in India". The work conducted at this centre has revealed that "high altitude species are less sensitive than the low altitude species to the environmental stresses". The germination studies of alpine plants made by Purohit and his associates have helped in germinating many endangered species and establishing them in nature in the alpine field station at Tungnath. He and his associates have come up with the cultivation technology for Aconites, alpine and sub-alpine plants of very high medicinal value, where yield is increased 10 to 12 fold. He has made valuable scientific contribution on mountain plants and the mountain ecosystem. After retiring from H.N.B. Garhwal University in 2002, he was offered the special Chair by Government of Uttarakhand to advice on conservation, development and cultivation of medicinal and aromatic plants in the State. He has established a Centre for Aromatic Plants for the State.
He was the member of Board of Governors, International Centre for Integrated Mountain Development (ICIMOD), Nepal from 1991–1997; Member, Initial Organizing Committee of International Mountain Forum from 1995 to 1997. He is also the member of editorial board for the Journal of Sustainable Forestry.
Besides being the member of several national committees, Purohit was the member of the group constituted by the Planning Commission, Govt. of India to formulate the national policy for the development of Himalayan region. He was instrumental in preparing the action plan for the Himalayan region, which was approved by the Indian Parliament in 1992.
Positions held.
2010 onwards: Adjunct Professor, School of Environmental Studies, Doon University, Dehradun
Professional services (international).
[[File:High Altitude Plant Physiology Centre, Srinagar Garhwal.jpg|thumb|The High Altitude Plant Physiology Centre, Srinagar Garhwal was established by Prof. A.N. Purohit and he served as its director from March 1985 to August 1990 and from September 1995 to June 2002]]
Popular publications.
He has published more than 175 papers and has guided 20 research scholars.
Contribution to science and technology development.
Purohit has worked mainly on ecophysiology of tree species and physiology of high altitude medicinal plants.
Purohit demonstrated for the first time that the indeterminate species can be made determinate. Based on this observation, he proposed that it is the channelization of food factors and the reproductive hormones, which controls the indeterminate or determinate nature of the plants. Prof. Purohit has shown a close relationship between photosystem I and onset of generative phase, which he has explained in terms of the energy requirement as a prelude to generative phase. He has proposed that evocation in leaves leading to the onset of floral induction starts with biophysical processes relating to the excitation of molecules in response to light and oxidation-reduction state of reaction centre pigments.
Purohit worked out the dynamics of shoot elongation and expansion showing recurrent growth pattern and reported appreciable histological changes in the shoot apex during longest period of dormancy and onset of reproductive phase, which was the first report of such developmental process in trees. This he further confirmed by a simple experiment in which he grew dogalus fir seedlings in high concentration of CO2 which induced bud dormancy leading to differentiation of cone like structure in one year old seedlings of this plant.
He studied the effect of CO2 enrichment and reported that high concentration of CO2 inhibits flowering in classical short day plants and induces flowering in long day plants and even the phytochrome mediated responses in flowering are associated with the presence of CO2 during red light interruption. He also reported for the first time that CO2 enrichment also affects viral multiplication.
Purohit and his associates have added valuable information to the scientific field with respect to the applied value of variations in leaf temperatures in plants. They have identified two groups of tree species; namely under and over temperature tree species. According to their findings under temperature species have higher survival potential on highly exposed subtropical mountain slopes with high temperature and irradiance. Based on physiological parameters, he worked out the superiority index for selection of tree species for plantation in mountains and their fuel wood value index.
Purohit's study on large cardamum and mandarin based agroforestry systems in Sikkim revealed: (1) acceleration of nutrient cycling under the influence of N2 fixing trees, (2) greater release of nutrients from non-N2-fixer letter and (3) solubilisation of secondarily fixed phosphorus by Alnus and Albizia. These findings have great significance in agroforestry model development.
After joining Garhwal University, Purohit initiated work on the physiology of high altitude plants. He established a High Altitude Plant Physiology Research Centre with its alpine field station at 13000-ft elevation at Tungnath. The work conducted at this centre has reveals that high altitude species are less sensitive than the low altitude species to the environmental stresses. He has reported "Pseudomonocotyle" and regulatory role of cotyledons in the growth of epicotyle in some of the alpine dicot species. The germination studies of alpine plants made by Purohit and his associates have helped in germinating many endangered species and establishing them in nature in the alpine field station at Tungnath. He and his associates have come up with the cultivation technology for Aconites, alpine and sub-alpine plants of very high medicinal value, where yield is increased 10 to 12 fold.
Purohit helped the government of India in establishing G.B. Pant Institute of Himalayan Environment and Development. The Institute has its units all over Indian Himalaya. With the assistance of all the staff members of the institute, Purohit prepared a based document entitled "Action Plan for Himalaya" which forms the base document for the sustainable development of the Himalayan region. During his tenure, he initiated number of programmes in Himalayan region Badrivan Restoration with the help of pilgrims was one of the unique programme which has been cited internationally as a model for restoration of religious places all over the World.
For his valuable scientific contribution in Indian mountains, Purohit was awarded [[List of Padma Shri award recipients (1990–99)|Padma Shri]] by the President of India in 1997.
External links.
[[Category:Recipients of the Padma Shri in science & engineering]]
[[Category:Fellows of the Indian National Science Academy]]
[[Category:Indian ecologists]]
[[Category:Plant physiologists]]
[[Category:1940 births]]
[[Category:Living people]]
[[Category:Scientists from Dehradun]]
[[Category:Fellows of The National Academy of Sciences, India]]
[[Category:Fellows of the National Academy of Agricultural Sciences]]
[[Category:20th-century Indian botanists]]