TY - JOUR
T1 - C4 Equivalent Decarboxylation Competence in Tropical Orchids
AU - Mukundan, Nidhi S.
AU - Banerjee, Sunaina
AU - Kumar, Shruti
AU - Satyamoorthy, Kapaettu
AU - Babu, Vidhu Sankar
N1 - Funding Information:
The authors thank Manipal Multidisciplinary Developmental Research Centre (MMRDC) and the European Union for funding this research program. The authors thank the Former Vice-Chancellor of Manipal Academy of Higher Education, Dr H.Vinod Bhat, for reviewing the progress in the research work, every three months. The authors thank Dr Neeta Inamdar, for facilitating the regular assessments. The authors are thankful to Dr Radhakrishna Rao and (Late) Dr K.G. Bhat, the consultant taxonomists of Manipal School of Life Sciences, Manipal Academy of Higher Education, who helped in confirming the taxonomical identity of tropical orchids. The authors are indebted to Manipal Academy of Higher Education, for providing all the necessary facilities for implementing the Research program.
Publisher Copyright:
© 2023, The Author(s).
PY - 2023
Y1 - 2023
N2 - Tropical xero-epiphytic orchids undergo a photosynthetic mechanism called ‘Crassulacean Acid Metabolism’, a modification of Calvin–Benson cycle. This anabolic process aids in the long-term retention of organically fixed CO2, imprinting them as active sequestrators and fixers of gaseous CO2. The malate decarboxylation competence of enzymes—phosphoenolpyruvate carboxykinase (PEPCK), Nicotinamide Adenine Dinucleotide malic enzyme (NAD-ME) and Nicotinamide Adenine Dinucleotide Phosphate malic enzyme (NADP-ME) in xero-epiphytic orchids that concentrate CO2 by employing RuBisCO to embark on a carboxylation route is defined in this paper. Physiological parameters like photosynthetic rates, and quantum yield, accompanied by histomorphometry were analysed. Our study indicated PEPCK as the dominant decarboxylating enzyme in tropical orchids. The efficiency of PEPCK was reinforced by two additional malic enzymes, which are dependent on cofactors, namely Nicotinamide Adenine Dinucleotide and Nicotinamide Adenine Dinucleotide Phosphate. These results indicated the need to appraise the potential of tropical orchids as strategic plant contenders for CO2 triggered greenhouse effect mitigator.
AB - Tropical xero-epiphytic orchids undergo a photosynthetic mechanism called ‘Crassulacean Acid Metabolism’, a modification of Calvin–Benson cycle. This anabolic process aids in the long-term retention of organically fixed CO2, imprinting them as active sequestrators and fixers of gaseous CO2. The malate decarboxylation competence of enzymes—phosphoenolpyruvate carboxykinase (PEPCK), Nicotinamide Adenine Dinucleotide malic enzyme (NAD-ME) and Nicotinamide Adenine Dinucleotide Phosphate malic enzyme (NADP-ME) in xero-epiphytic orchids that concentrate CO2 by employing RuBisCO to embark on a carboxylation route is defined in this paper. Physiological parameters like photosynthetic rates, and quantum yield, accompanied by histomorphometry were analysed. Our study indicated PEPCK as the dominant decarboxylating enzyme in tropical orchids. The efficiency of PEPCK was reinforced by two additional malic enzymes, which are dependent on cofactors, namely Nicotinamide Adenine Dinucleotide and Nicotinamide Adenine Dinucleotide Phosphate. These results indicated the need to appraise the potential of tropical orchids as strategic plant contenders for CO2 triggered greenhouse effect mitigator.
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U2 - 10.1007/s12374-023-09385-6
DO - 10.1007/s12374-023-09385-6
M3 - Article
AN - SCOPUS:85147662966
SN - 1226-9239
JO - Singmul Hakhoe chi. The Korean journal of botany
JF - Singmul Hakhoe chi. The Korean journal of botany
ER -
