International Science Community Association Research Journal of Recent Sciences 2277 - 2502 6 1 2017 01 2 Evaluation of blackgram (vigna mungo (L.) hepper) genotypes under high temperature and interaction with elevated carbon dioxide 11 21 EN Md Firoz Kalam 1 Department of Process Engineering and Engineering and Technology, Bremerhaven University of Applied Sciences, An der Karlstadt 8, 27568 Bremerhaven, Germany S. Amuthenie 1 Department of Agricultural Chemistry, Faculty of Agriculture, Eastern University, Sri Lanka Partheeban C. 1 Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu -641 003, India Vijayaraghavan H. 2 Department of Floriculture and Medicinal Crops, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu -641 003, India > Research Paper 2016 4 30 2017 01 2 The crop productivity reduction was caused by the hot weather condition in several climatic zones. The reproductive stages are very sensitive to the heat stress in many plants. In recent days, the temperature drastically increased due to global warming. In this century, the atmospheric carbon dioxide concentrations increased from 300 to 399 ppm and it may further increase during the next century. The objectives of this study were to determine the responses of blackgram genotypes to ambient and elevated carbon dioxide (CO2) under high temperature and optimal temperature, test the pollen viability, pollen germination, fertility coefficient and yield. Pulses are vulnerable to heat stress and results in substantial yield loss. In this study, the impact of elevated carbon dioxide and high temperature interaction was studied in blackgram. Based on Temperature Induction Response (TIR), six genotypes representing the three categories of heat tolerance (highly heat tolerant, moderately heat tolerant and heat susceptible) were screened. The six selected blackgram genotypesare i) VBG-07-001, VBG-06-010 (Heat tolerant) ii) VBN-6, COBG-11-02 (Moderately heat tolerant) and iii) COBG-11-03, VBG-08- 003 (Heat susceptible). These six genotypes were chosen to study the impact of elevated CO2 and high temperature interaction. The observations on pollen viability, pollen germination, number of flowers, total flowers shed and fertility coefficient has shown that there is a beneficial effect when the crop is subjected to 700 ppm of carbon dioxide with ambient temperature. Interestingly, it was also seen that tolerant genotypes VBG-07-001, VBG-006-010 registered higher yield of 16.3 and 15.8 respectively under elevated CO2 and ambient temperature. Copyright@ International Science Community Association