Flexibility of C4 decarboxylation and photosynthetic plasticity in sugarcane plants under shading

Sales, Cristina Rodrigues Gabriel; Ribeiro, Rafael Vasconcelos; Hayashi, Adriana Hissae; Marchiori, Paulo Eduardo Ribeiro; Silva, Karina Iolanda; Martins, Márcio O.; Silveira, Joaquim Albenísio Gomes da; Silveira, Neidiquele M.; Machado, Eduardo Caruso

doi:10.1016/j.envexpbot.2017.10.027

Cited by 36 publications

(36 citation statements)

References 49 publications

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“…3a, b). It has been speculated that this enzyme provides the necessary ATP to increase PEPCK activity for sugarcane plants under stress [11, 32]. Western Blot analyses showed that plant species that use predominantly PEPCK have significant levels of NAD-ME [33].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The rise in PEPCK activity can be modulated by various environmental factors [5, 11]. Specifically in sugarcane, shading caused increases in the decarboxylation by PEPCK, which shows that this enzyme is the main decarboxylase under low light conditions [11]. These authors showed that PEPCK decarboxylation uses less quanta per CO 2 fixed than NADP-ME , thus the increase in PEPCK activity advantageous contribute to maintaining or even increasing quantum efficiency of CO 2 assimilation under limiting light.…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, in sugarcane, a study using the SAGE (Serial Analysis of Gene Expression) technique showed that PEPCK transcript was more abundant than that of NADP-ME in bundle sheath cells [10]. Recently, was reported the activity of the three decarboxylases (NADP-ME, NAD-ME and PEPCK) in sugarcane plants and that shading caused increases in the decarboxylation through PEPCK [11]. This flexibility in the use of enzymes of different C4 subtypes has direct consequences on energy requirements for photosynthesis and, consequently, for the acclimation to fluctuating environmental conditions [5, 11–13].…”

Section: Introductionmentioning

confidence: 99%

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Decarboxylation mechanisms of C4 photosynthesis in Saccharum spp.: increased PEPCK activity under water-limiting conditions

et al. 2019

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Background C4 plants have been classified into three subtypes based on the enzymes used to decarboxylate C4 acids in the bundle sheath cells (NADP-ME, NAD-ME and PEPCK pathways). Evidences indicate that, depending on environmental factors, C4 plants may exhibit a certain degree of flexibility in the use of the decarboxylation mechanisms. In this context, the objective was to extend the knowledge on the degree of flexibility between the pathways of decarboxylation in sugarcane, a NADP-ME species, at different levels of water deficit. Results An experiment was carried out with two cultivars - RB92579 (tolerant to water deficit) and SP80–3280 (susceptible to water deficit) subjected to moderate level (− 1.5 to − 1.8 MPa), severe level (below − 2.0 MPa) and recovery (48 h after rehydration) and changes in the activities of the enzymes involved in the three C4 mechanisms and in gene expression were investigated. Our results showed that sugarcane uses the PEPCK pathway as a decarboxylation mechanism in addition to the NADP-ME, which was more evident under water deficit conditions for both cultivars. Conclusions The results obtained here, show that sugarcane increases the use of the PEPCK pathway as a decarboxylation mechanism, in addition to the NADP-ME pathway, under conditions of water deficit, particularly in the tolerant cultivar. Electronic supplementary material The online version of this article (10.1186/s12870-019-1745-7) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decarboxylation mechanisms of C4 photosynthesis in Saccharum spp.: increased PEPCK activity under water-limiting conditions

et al. 2019

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“…Shade acclimation in C 4 species has been studied primarily by comparing plants grown in high vs. low light (Tazoe et al, 2008;Sales et al, 2018;Sonawane et al, 2018). On this basis, it has been observed that C 4 species have relatively poor acclimation to shade relative to C 3 species (Sage and McKown, 2006), but C 4 grasses which use the NADP-ME subtype, such as Z. mays, acclimate to shade more readily than those using NAD-ME or PEP-CK subtypes (Sonawane et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Light, Not Age, Underlies the Maladaptation of Maize and Miscanthus Photosynthesis to Self-Shading

et al. 2020

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Zea mays and Miscanthus × giganteus use NADP-ME subtype C 4 photosynthesis and are important food and biomass crops, respectively. Both crops are grown in dense stands where shaded leaves can contribute a significant proportion of overall canopy productivity. This is because shaded leaves, despite intercepting little light, typically process light energy very efficiently for photosynthesis, when compared to light-saturated leaves at the top of the canopy. However, an apparently maladaptive loss in photosynthetic light-use efficiency as leaves become shaded has been shown to reduce productivity in these two species. It is unclear whether this is due to leaf aging or progressive shading from leaves forming above. This was resolved here by analysing photosynthesis in leaves of the same chronological age in the centre and exposed southern edge of field plots of these crops. Photosynthetic light-response curves were used to assess maximum quantum yield of photosynthesis; the key measure of photosynthetic capacity of a leaf in shade. Compared to the upper canopy, maximum quantum yield of photosynthesis of lower canopy leaves was significantly reduced in the plot centre; but increased slightly at the plot edge. This indicates loss of efficiency of shaded leaves is due not to aging, but to the altered light environment of the lower canopy, i.e., reduced light intensity and/or altered spectral composition. This work expands knowledge of the cause of this maladaptive shade response, which limits productivity of some of the world's most important crops.

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Decarboxylation mechanisms of the C4 cycle in foxtail millet observed under salt and selenium treatments

et al. 2022

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Flexibility of C4 decarboxylation and photosynthetic plasticity in sugarcane plants under shading

Cited by 36 publications

References 49 publications

Decarboxylation mechanisms of C4 photosynthesis in Saccharum spp.: increased PEPCK activity under water-limiting conditions

Decarboxylation mechanisms of C4 photosynthesis in Saccharum spp.: increased PEPCK activity under water-limiting conditions

Light, Not Age, Underlies the Maladaptation of Maize and Miscanthus Photosynthesis to Self-Shading

Decarboxylation mechanisms of the C4 cycle in foxtail millet observed under salt and selenium treatments

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