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The role of rootstocks on carbohydrate metabolism and transport in citrus species under water deficit

Grant number: 15/14817-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): November 01, 2015
Effective date (End): July 31, 2019
Field of knowledge:Biological Sciences - Botany
Principal Investigator:Rafael Vasconcelos Ribeiro
Grantee:Simone Ferreira da Silva
Home Institution: Instituto de Biologia (IB). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

An effective strategy to mitigate the impacts of water scarcity on citrus production is the use of rootstocks tolerant to drought. The Rangpur lime rootstock is able to change the sensitivity of plant shoot to drought, maintaining the availability of carbohydrates and root growth under unfavourable conditions. These responses indicate the ability to coordinate the source-sink relationship, adjusting the balance between synthesis and consumption of carbohydrate through changes in photosynthesis, respiration and carbohydrates partitioning. In such context, this proposal will test the hypothesis that carbohydrate metabolism is more active in drought-tolerant rootstock, which would lead to further root growth and increase the sink strength. As consequence, there would be an increase in import of photoassimilates in roots and a stimulation of photoassimilates exportation from leaves. The three rootstocks most used in Brazilian citrus industry, Swingle citrumelo, Sunki tangerine and Rangpur lime will be used in two experiments to test this hypothesis. Inside a growth chamber, plants of each rootstock will be divided into two lots and one of the lots will be subjected to water withholding for 18 days following substrate rehydration. Gas exchange, leaf water potential, biometry, contents of carbohydrates in leaves, stem and roots, activity of key enzymes of sucrose metabolism and the determination of ATP will be evaluated. In the second experiment, the plants will receive a gas mixture containing 13C before the water deficit, and measurements of gas exchange and leaf water potential and analysis of 13C partitioning and phloem sap will be taken. The experiments will be carried out in a random block design in a factorial scheme with the factors being the rootstock species, the water regime and the time of evaluation. The normality of the data will be checked and they will be subjected to the analysis of variance, being mean values compared by the Tukey test (p<0.05). (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MIRANDA, MARCELA TREVENZOLI; DA SILVA, SIMONE FERREIRA; MOURA, BARBARA BASSO; HAYASHI, ADRIANA HISSAE; MACHADO, EDUARDO CARUSO; RIBEIRO, RAFAEL VASCONCELOS. Hydraulic redistribution in Citrus rootstocks under drought. THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY, v. 30, n. 3, p. 165-172, SEP 2018. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.