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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(8): 518-525
DOI: https://doi.org/10.20546/ijcmas.2018.708.057


Physiological and Molecular Basis of Drought Tolerance Responses in Tomato (Solanum lycopersicum L.) under Carbon Dioxide Enrichment
Dheeraj Chatti* and R.V. Manju
Department of Plant Physiology, College of Agriculture, Vellayani, Kerala Agricultural University, Thiruvananthapuram – 695 522, Kerala, India
*Corresponding author
Abstract:

The sensitivity of photosynthesis to each of the environmental variables including low water availability, high temperature, is associated with the inevitable rise in atmospheric carbon dioxide. Plant growth responses to the increasing CO2 concentration will not only affect ecosystem productivity in the future, but also the magnitude of C sequestration by plants. The level of CO2 in the atmosphere is rising at an unprecedented rate. Under elevated CO2 conditions, it has also been found that plants maintain higher total water potentials to increase biomass production and to be generally more drought tolerant. Physiological and molecular basis of varietal responses of tomato to water stress conditions and their modifications under elevated CO2 environment was studied by conducting a pot culture experiment with three varieties of tomato i.e., Manulakshmi, Vellayani Vijay and Anagha in Open Top Chambers (OTC) system. Water stress conditions were imposed on one month old potted plants during their critical stages of development and then were allowed to recover. Various biochemical and growth parameters like free amino acids, reducing sugar content, total dry matter content and antioxidants like ascorbic acid content were analysed to understand the effect of CO2 enrichment on drought tolerance. Electrophoresis analysis of proteins was performed using SDS PAGE. Elevated CO2 was found to increase total dry matter production (5.74 g), reducing sugars (15.13 mg/g), free amino acids (1.57 mg/g) and ascorbic acid (10.31 mg/100g) content. Global warming and the demands of an increasing world population will increase water scarcity, which results in increased demand for water use efficient and drought tolerant crop plants. It has become imperative to elucidate the environmental stresses. responses and adaptation of crops to water scarce conditions under changing climatic scenario and take actions to improve the drought tolerance ability of crop plants and to ensure higher crop yields against unfavourable conditions.


Keywords: Climate change, Global warming, Elevated CO2, Water stress, Drought tolerance
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How to cite this article:

Dheeraj Chatti and Manju, R.V. 2018. Physiological and Molecular Basis of Drought Tolerance Responses in Tomato (Solanum lycopersicum L.) under Carbon Dioxide Enrichment.Int.J.Curr.Microbiol.App.Sci. 7(8): 518-525. doi: https://doi.org/10.20546/ijcmas.2018.708.057