Influence of water stress on the carbon isotopic composition of modern plants: Implications for C4 plant appearance in Indian subcontinent

Sayak Basu1, Sambit Ghosh1 and Prasanta Sanyal2, (1)Indian Institute of Science Education and Research Kolkata, Kolkata, India, (2)Indian Institute of Science Education and Research Kolkata, Department of Earth Sciences, Mohanpur, India