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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

What does the RuBisCO activity tell us about a C-3-CAM plant?

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Author(s):
Goncalves, Ana Z. [1] ; Latsanio, Sabrina [1] ; Detmann, Kelly C. [2] ; Marabesi, Mauro A. [3] ; Neto, Antonio A. C. [1] ; Aidar, Marcos P. M. [4] ; DaMatta, Fabio M. [2] ; Mercier, Helenice [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Biociencias, Dept Bot, Rua Matao 277, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Fed Vicosa, Dept Biol Vegetal, Vicosa, MG - Brazil
[3] Univ Estadual Campinas, Dept Biol Vegetal, Campinas, SP - Brazil
[4] Inst Bot Sao Paulo, Secretaria Meio Ambiente, Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Plant Physiology and Biochemistry; v. 147, p. 172-180, FEB 2020.
Web of Science Citations: 0
Abstract

Plants that perform the Crassulacean acid metabolism (CAM), which obtain CO2 overnight and convert it mainly in malic acid, successfully grow in environments with water and nutrient shortages, that is partly associated with their higher water- and nitrogen-use efficiencies. Water and nutrient limitations can impair photosynthesis through the reduction of RuBisCO and increment of photorespiration, disturbing the plant carbon balance. In this context, we conducted a controlled experiment with the epiphytic C-3-CAM bromeliad Guzmania monostachia to investigate how the combined water and nutritional deficits affect the activity of RuBisCO and its activation state (RAS), and to evaluate the efficiency of photosynthesis during the transition from C-3 to CAM. Apart from an increase in CAM activity, bromeliads submitted to both water and nutritional deficits showed higher RAS values and unaltered RuBisCO activity compared to C-3 bromeliads and, surprisingly, the maximum quantum efficiency of photosynthesis increased. Glucose, fructose and starch levels were maintained, while sucrose concentrations increased over time. These results, combined with the high RAS values, suggest an increased efficiency of RuBisCO functioning. Our results reinforce the ability of epiphytic bromeliads to deal with stressful habitats by a higher efficiency of RuBisCO during the transition to CAM, another feature that may allow their evolution in the epiphytic environment. (AU)

FAPESP's process: 16/09699-5 - Nitrogen metabolism and its interaction with the Crassulacean acid metabolism (CAM) in Guzmania monostachia (Bromeliaceae): a physiological and molecular approach
Grantee:Ana Zangirólame Gonçalves
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/12667-3 - Exploring the physiological and molecular aspects of Guzmania monostachia (Bromeliaceae): studying the functional pathways of photosynthesis and nutrient responses.
Grantee:Helenice Mercier
Support Opportunities: Regular Research Grants
FAPESP's process: 11/50637-0 - Competence for Crassulacean Acid Metabolism (CAM) expression in epiphytic bromeliad: signaling, modulation of expression, transcriptional profile and interaction with the nitrogen metabolism
Grantee:Helenice Mercier
Support Opportunities: Research Projects - Thematic Grants