| Full text | |
| Author(s): |
Eduardo Augusto Girardi
[1]
;
Andréa Dias Brandão
[2]
;
Rubens Duarte Coelho
[3]
;
Hilton Thadeu Zarate do Couto
[4]
;
Marcos Silveira Buckeridge
[5]
;
Francisco de Assis Alves Mourão Filho
[6]
Total Authors: 6
|
| Affiliation: | [1] Universidade de São Paulo - Brasil
[2] University of São Paulo - Brasil
[3] Universidade de São Paulo - Brasil
[4] Universidade de São Paulo - Brasil
[5] University of São Paulo - Brasil
[6] Universidade de São Paulo - Brasil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | Revista Brasileira de Fruticultura; v. 40, n. 6 2018-11-23. |
| Abstract | |
Abstract Drought tolerance is a major trait for the selection of citrus rootstocks in breeding programs. PEG 4000 solution at 110 g L-1 (osmotic potential of -376 kPa) was used to evaluate biometric, physiological, and biochemical responses of grafted citrus plants in pots. ‘Valencia’ sweet orange plants grafted onto ‘Rangpur’ lime (drought tolerant) rootstock showed greater plant growth compared to that on ‘Swingle’ citrumelo (drought sensitive) rootstock, regardless of PEG-induced stress; however, biological responses to PEG were similar on both rootstocks. Plant dry weight, gas exchange, and leaf and root starch concentrations were reduced by PEG. Water potential at 2:00 p.m. and Fe and Mn leaf concentrations increased with severe phytotoxic symptoms. The results corroborate the limitation of PEG for assessing drought tolerance of citrus plants at the whole plant level. (AU) | |