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.)

Rootstocks induce contrasting photosynthetic responses of orange plants to low night temperature without affecting the antioxidant metabolism

Author(s):
Sao Pedro Machado, Daniela Favero [1] ; Ribeiro, Rafael Vasconcelos [2] ; Gomes da Silveira, Joaquim Albenisio [3] ; Magalhaes Filho, Jose Rodrigues [1] ; Machado, Eduardo Caruso [1]
Total Authors: 5
Affiliation:
[1] Inst Agron IAC, Lab Plant Physiol Coaracy M Franco, Campinas, SP - Brazil
[2] Univ Estadual Campinas UNICAMP, Plant Biol Dept, Inst Biol, Campinas, SP - Brazil
[3] Univ Fed Ceara, Biochem & Mol Biol Dept, Fortaleza, Ceara - Brazil
Total Affiliations: 3
Document type: Journal article
Source: THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY; v. 25, n. 1, p. 26-35, 2013.
Web of Science Citations: 8
Abstract

Low temperatures negatively impact the metabolism of orange trees, and the extent of damage can be influenced by the rootstock. We evaluated the effects of low nocturnal temperatures on Valencia orange scions grafted on Rangpur lime or Swingle citrumelo rootstocks. We exposed six-month-old plants to night temperatures of 20 degrees C and 8 degrees C under controlled conditions. After decreasing the temperature to 8 degrees C, there were decreases in leaf CO2 assimilation, stomatal conductance, mesophyll conductance and CO2 concentration in the chloroplasts, in plant hydraulic conductivity and in the maximum electron transport rate driven ribulose-1,5-bisphosphate (RuBP) regeneration in plants grafted on both rootstocks. However, the effects of low night temperature were more severe in plants grafted on Rangpur rootstock, which also presented reduction in the maximum rate of RuBP carboxylation and in the maximum quantum efficiency of the PSII. In general, irreversible damage due to night chilling was found in the photosynthetic apparatus of plants grafted on Rangpur lime. Low night temperatures induced similar changes in the antioxidant metabolism, preventing oxidative damage in citrus leaves on both rootstocks. As photosynthesis is linked to plant growth, our findings indicate that the rootstock may improve the performance of citrus trees in environments with low night temperatures, with Swingle rootstock improving the photosynthetic acclimation in leaves of orange plants. (AU)

FAPESP's process: 05/57862-8 - Flowering and fruiting in Valencia orange tree: anatomical, physiological, biochemical and molecular aspects
Grantee:Marcelo Carnier Dornelas
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 07/53520-0 - Response of photosynthesis to variation of temperature in the root system of Valencia-orange
Grantee:José Rodrigues Magalhães Filho
Support Opportunities: Scholarships in Brazil - Master