Flexibility of C-4 decarboxylation and photosynthetic plasticity in sugarcane plants under shading

Author(s)

Sales, Cristina R. G. ^{[1, 2]} ; Ribeiro, Rafael V. ^[3] ; Hayashi, Adriana H. ^[4] ; Marchiori, Paulo E. R. ^{[2, 5]} ; Silva, Karina I. ^[2] ; Martins, Marci O. ^{[6, 7]} ; Silveira, Joaquim A. G. ^[6] ; Silveira, Neidiquele M. ^[2] ; Machado, Eduardo C. ^[2]

Affiliation

^[1] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ - England

^[2] Agron Inst IAC, Ctr Res & Dev Ecophysiol & Biophys, Lab Plant Physiol Coaracy M Franco, BR-13020902 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Inst Biol, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil

^[4] Inst Bot, Ctr Res Anat, BR-04301902 Sao Paulo, SP - Brazil

^[5] Univ Lavras UFLA, Dept Biol, BR-37200000 Lavras, MG - Brazil

^[6] Fed Univ Ceara UFC, Lab Plant Metab, Dept Biochem & Mol Biol, BR-60455970 Fortaleza, CE - Brazil

^[7] Fed Univ Acre UFAC, Ctr Biol Sci & Nat, BR-69920900 Rio Branco, AC - Brazil

• Document type: Journal article
• Source: ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 149, p. 34-42, MAY 2018.
• Web of Science Citations: 4

Abstract

The flexibility between C-4 photosynthetic subtypes NADP-malic enzyme (NADP-ME) and phosphoenolpyruvate carboxykinase (PEPCK), recently identified in some C-4 species, confers high photosynthetic efficiency under varying light conditions. Theoretically, PEPCK decarboxylation uses less quanta per CO2 fixed than NADP-ME, suggesting an increase in PEPCK activity could be advantageous under shading, as CO2 leakiness increases under low light. Thus, we hypothesize that sugarcane plants have flexibility among the decarboxylation pathways, i.e., more than one decarboxylation route occurs independent of the environmental condition; furthermore, low light availability induces biochemical and anatomical adjustments resulting in increased PEPCK activity, which could contribute to maintaining or even increasing quantum efficiency of CO2 assimilation under limiting light. Two sugarcane varieties were evaluated and both presented activities of the three decarboxylases, either under full sunlight or shading. In vitro PEPCK activity increased in plants grown under low light, suggesting an upregulation of this decarboxylation pathway. Accordingly, changes in chloroplast arrangement of bundle sheath cells from centrifugal to evenly distributed were found. Our data suggest that such biochemical and anatomical adjustments found in sugarcane grown under shading were important to maintain the maximum quantum efficiency of CO2 assimilation. Finally, we propose a model highlighting the integration between the decarboxylation pathways under shading, considering carboxylation and decarboxylation pathways in sugarcane plants. (AU)

• FAPESP's process: 08/57495-3 - Integrating physiological, morphological and anatomical traits to understand the differential sucrose yield in sugarcane genotypes
• Grantee: Eduardo Caruso Machado
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants