1
|
Grandis A, Leite DCC, Tavares EQP, Arenque-Musa BC, Gaiarsa JW, Martins MCM, De Souza AP, Gomez LD, Fabbri C, Mattei B, Buckeridge MS. Cell wall hydrolases act in concert during aerenchyma development in sugarcane roots. Ann Bot 2019; 124:1067-1089. [PMID: 31190078 PMCID: PMC6881219 DOI: 10.1093/aob/mcz099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 06/07/2019] [Indexed: 05/09/2023]
Abstract
BACKGROUND AND AIMS Cell wall disassembly occurs naturally in plants by the action of several glycosyl-hydrolases during different developmental processes such as lysigenous and constitutive aerenchyma formation in sugarcane roots. Wall degradation has been reported in aerenchyma development in different species, but little is known about the action of glycosyl-hydrolases in this process. METHODS In this work, gene expression, protein levels and enzymatic activity of cell wall hydrolases were assessed. Since aerenchyma formation is constitutive in sugarcane roots, they were assessed in segments corresponding to the first 5 cm from the root tip where aerenchyma develops. KEY RESULTS Our results indicate that the wall degradation starts with a partial attack on pectins (by acetyl esterases, endopolygalacturonases, β-galactosidases and α-arabinofuranosidases) followed by the action of β-glucan-/callose-hydrolysing enzymes. At the same time, there are modifications in arabinoxylan (by α-arabinofuranosidases), xyloglucan (by XTH), xyloglucan-cellulose interactions (by expansins) and partial hydrolysis of cellulose. Saccharification revealed that access to the cell wall varies among segments, consistent with an increase in recalcitrance and composite formation during aerenchyma development. CONCLUSION Our findings corroborate the hypothesis that hydrolases are synchronically synthesized, leading to cell wall modifications that are modulated by the fine structure of cell wall polymers during aerenchyma formation in the cortex of sugarcane roots.
Collapse
Affiliation(s)
- Adriana Grandis
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| | - Débora C C Leite
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| | - Eveline Q P Tavares
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| | - Bruna C Arenque-Musa
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| | - Jonas W Gaiarsa
- GaTE Lab, Department of Botany, Institute of Bioscience, University of São Paulo, São Paulo, Brazil
| | - Marina C M Martins
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| | - Amanda P De Souza
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Leonardo D Gomez
- Centre for Novel Agricultural Products, Department of Biology, University of York, UK
| | - Claudia Fabbri
- Department of Biology and Biotechnology ‘C. Darwin’, University of Rome – Sapienza, Italy
| | - Benedetta Mattei
- Department of Biology and Biotechnology ‘C. Darwin’, University of Rome – Sapienza, Italy
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Italy
| | - Marcos S Buckeridge
- Laboratory of Plant Physiological Ecology (LAFIECO), Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, SP, Brazil
| |
Collapse
|
2
|
De Souza AP, Grandis A, Arenque-Musa BC, Buckeridge MS. Diurnal variation in gas exchange and nonstructural carbohydrates throughout sugarcane development. Funct Plant Biol 2018; 45:865-876. [PMID: 32291068 DOI: 10.1071/fp17268] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 02/10/2018] [Indexed: 05/21/2023]
Abstract
Photosynthesis and growth are dependent on environmental conditions and plant developmental stages. However, it is still not clear how the environment and development influence the diurnal dynamics of nonstructural carbohydrates production and how they affect growth. This is particularly the case of C4 plants such as sugarcane (Saccharum spp.). Aiming to understand the dynamics of leaf gas exchange and nonstructural carbohydrates accumulation in different organs during diurnal cycles across the developmental stages, we evaluated these parameters in sugarcane plants in a 12-month field experiment. Our results show that during the first 3 months of development, light and vapour pressure deficit (VPD) were the primary drivers of photosynthesis, stomatal conductance and growth. After 6 months, in addition to light and VPD, drought, carbohydrate accumulation and the mechanisms possibly associated with water status maintenance were also likely to play a role in gas exchange and growth regulation. Carbohydrates vary throughout the day in all organs until Month 9, consistent with their use for growth during the night. At 12 months, sucrose is accumulated in all organs and starch had accumulated in leaves without any diurnal variation. Understanding of how photosynthesis and the dynamics of carbohydrates are controlled might lead to strategies that could increase sugarcane's biomass production.
Collapse
Affiliation(s)
- Amanda P De Souza
- Laboratory of Plant Physiological Ecology, Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, 05508-090, SP, Brazil
| | - Adriana Grandis
- Laboratory of Plant Physiological Ecology, Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, 05508-090, SP, Brazil
| | - Bruna C Arenque-Musa
- Laboratory of Plant Physiological Ecology, Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, 05508-090, SP, Brazil
| | - Marcos S Buckeridge
- Laboratory of Plant Physiological Ecology, Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo, 05508-090, SP, Brazil
| |
Collapse
|
3
|
Rezende LFC, Arenque-Musa BC, Moura MSB, Aidar ST, Von Randow C, Menezes RSC, Ometto JPBH. Calibration of the maximum carboxylation velocity (Vcmax) using data mining techniques and ecophysiological data from the Brazilian semiarid region, for use in Dynamic Global Vegetation Models. BRAZ J BIOL 2016; 76:341-51. [PMID: 26959950 DOI: 10.1590/1519-6984.14414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 03/24/2015] [Indexed: 11/21/2022] Open
Abstract
The semiarid region of northeastern Brazil, the Caatinga, is extremely important due to its biodiversity and endemism. Measurements of plant physiology are crucial to the calibration of Dynamic Global Vegetation Models (DGVMs) that are currently used to simulate the responses of vegetation in face of global changes. In a field work realized in an area of preserved Caatinga forest located in Petrolina, Pernambuco, measurements of carbon assimilation (in response to light and CO2) were performed on 11 individuals of Poincianella microphylla, a native species that is abundant in this region. These data were used to calibrate the maximum carboxylation velocity (Vcmax) used in the INLAND model. The calibration techniques used were Multiple Linear Regression (MLR), and data mining techniques as the Classification And Regression Tree (CART) and K-MEANS. The results were compared to the UNCALIBRATED model. It was found that simulated Gross Primary Productivity (GPP) reached 72% of observed GPP when using the calibrated Vcmax values, whereas the UNCALIBRATED approach accounted for 42% of observed GPP. Thus, this work shows the benefits of calibrating DGVMs using field ecophysiological measurements, especially in areas where field data is scarce or non-existent, such as in the Caatinga.
Collapse
Affiliation(s)
- L F C Rezende
- Earth System Science Center, National Institute for Space Research, São José dos Campos, SP, Brazil
| | - B C Arenque-Musa
- Department of Botany, Universidade de São Paulo, São Paulo, SP, Brazil
| | - M S B Moura
- Embrapa Tropical Semiarid, Empresa Brasileira de Pesquisa Agropecuária, Petrolina, PE, Brazil
| | - S T Aidar
- Embrapa Tropical Semiarid, Empresa Brasileira de Pesquisa Agropecuária, Petrolina, PE, Brazil
| | - C Von Randow
- Earth System Science Center, National Institute for Space Research, São José dos Campos, SP, Brazil
| | - R S C Menezes
- Department of Nuclear Energy, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - J P B H Ometto
- Earth System Science Center, National Institute for Space Research, São José dos Campos, SP, Brazil
| |
Collapse
|