Journal of Stress Physiology & Biochemistry, Vol. 9 No. 3 2013, pp. 333-344 ISSN 1997-0838
Original Text Copyright (cc) 2013 by  Warrier, Jayaraj, Balu

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Variation in Gas Exchange Characteristics in Clones of Eucalyptus сamaldulensis Under Varying Conditions of CO2 

Rekha R. Warrier*, R.S.C. Jayaraj and A. Balu

Institute of Forest Genetics and Tree Breeding, (Indian Council of Forestry Research and Education), PB 1061, R.S. Puram Post, Coimbatore-641002, Tamil Nadu, India


Received  April  14
, 2013

The Institute of Forest Genetics and Tree Breeding, Coimbatore, India has a long term systematic tree improvement programme for Eucalyptus species aimed at enhancing productivity and breeding for trait specific clones. In the process, thirty high yielding clones of Eucalyptus camaldulensis Dehnh. were identified. Carbondioxide enrichment studies in special chambers help in understanding the changes at individual level, and also at physiological, biochemical and genetic level. It also provides valuable information for establishing plantations at different geographic locations. Considerable variations were observed when the selected 30 clones of E. camaldulensis were subjected to physiological studies under elevated CO2 conditions (600 mol mol-1). Ten clones exhibited superior growth coupled with favourable physiological characteristics including high photosynthetic rate, carboxylation and water use efficiency under elevated carbon di oxide levels. Clones with minimal variation in physiological characteristics under elevated levels of CO2 suggest their ability to overcome physiological stresses and adapt to varying climatic conditions.

Key words:     Eucalyptus camaldulensis, physiological, elevated CO2, gas exchange.

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