Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Short-term physiological changes in roots and leaves of sugarcane varieties exposed to H2O2 in root medium

Full text
Author(s):
Silva, Karina I. [1, 2] ; Sales, Cristina R. G. [1, 2] ; Marchiori, Paulo E. R. [1, 2] ; Silveira, Neidiquele M. [1, 2] ; Machado, Eduardo C. [2] ; Ribeiro, Rafael V. [3]
Total Authors: 6
Affiliation:
[1] Agron Inst IAC, Grad Program Trop & Subtrop Agr, Campinas, SP - Brazil
[2] IAC, Ctr R&D Ecophysiol & Biophys, Lab Plant Physiol Coaracy M Franco, Campmas, SP - Brazil
[3] Univ Estadual Campinas, UNICAMP, Inst Biol, Dept Plant Biol, Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Plant Physiology; v. 177, p. 93-99, APR 1 2015.
Web of Science Citations: 3
Abstract

The aim of this study was to evaluate the differential sensitivity of sugarcane genotypes to H2O2 in root medium. As a hypothesis, the drought tolerant genotype would be able to minimize the oxidative damage and maintain the water transport from roots to shoots, reducing the negative effects on photosynthesis. The sugarcane genotypes IACSP94-2094 (drought tolerant) and IACSP94-2101 (drought sensitive) were grown in a growth chamber and exposed to three levels of H2O2 in nutrient solution: control; 3 mmol L-1 and 80 mmol L-1. Leaf gas exchange, photochemical activity, root hydraulic conductance (L-r) and antioxidant metabolism in both roots and leaves were evaluated after 15 min of treatment with H2O2. Although, root hydraulic conductance, stomatal aperture, apparent electron transport rate and instantaneous carboxylation efficiency have been reduced by H2O2 in both genotypes, IACSP94-2094 presented higher values of those variables as compared to IACSP94-2101. There was a significant genotypic variation in relation to the physiological responses of sugarcane to increasing H2O2 in root tissues, being root changes associated with modifications in plant shoots. IACSP94-2094 presented a root antioxidant system more effective against H2O2 in root medium, regardless H2O2 concentration. Under low H2O2 concentration, water transport and leaf gas exchange of IACSP94-2094 were less affected as compared to IACSP94-2101. Under high H2O2 concentration, the lower sensitivity of IACSP94-2094 was associated with increases in superoxide dismutase activity in roots and leaves and increases in catalase activity in roots. In conclusion, we propose a general model of sugarcane reaction to H2O2, linking root and shoot physiological responses. (C) 2015 Elsevier GmbH. All rights reserved. (AU)

FAPESP's process: 12/19167-0 - INVOLVEMENT OF NITRIC OXIDE ON PHYSIOLOGICAL RESPONSES IN PLANTS OF SUGARCANE UNDER WATER DEFICIT
Grantee:Neidiquele Maria Silveira
Support Opportunities: Scholarships in Brazil - Doctorate