Modulation of Chlorophyll b Biosynthesis and Photosynthesis by Overexpression of Chlorophyllide a Oxygenase (CAO) in Tobacco

Ajaya K Biswal,Gopal K Pattanayak,Govindjee Govindjee,Vanga S Reddy,Sadhu Leelavathi,Baishnab C Tripathy

doi:10.1007/978-3-642-32034-7_28

Modulation of Chlorophyll b Biosynthesis and Photosynthesis by Overexpression of Chlorophyllide a Oxygenase (CAO) in Tobacco

Ajaya K Biswal, Gopal K Pattanayak + Show 4 more

https://doi.org/10.1007/978-3-642-32034-7_28

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Publication Date: Jan 1, 2013

Citations: 5

Affiliation: Jawaharlal Nehru University, University of Illinois Urbana-Champaign, International Centre for Genetic Engineering and Biotechnology

#Chlorophyllide A Oxygenase #Saturating Light Intensities + Show 8 more

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Abstract

Chlorophyll (Chl) b is synthesized by oxidation of a methyl group on the B ring of the porphyrin molecule to a formyl group by chlorophyllide (Chlide) a oxygenase (CAO). The overexpression of Arabidopsis thaliana full length CAO (AtCAO) in tobacco (Nicotiana tabacum) resulted in an increased Chl synthesis and a decreased Chl a/b ratio in low-light-grown (LL) as well as in high-light-grown (HL) tobacco plants, where the effect was more pronounced. In HL-plants, increased [Chl b] resulted in efficient capture of solar energy and enhanced (40%–80%) electron transport rates at both limiting and saturating light intensities.

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