| Full text | |
| Author(s): |
Fernando Trevizan Devite
[1]
;
Fernando Alves de Azevedo
[2]
;
Marinês Bastianel
[3]
;
Patrícia Marluci da Conceição
[4]
;
Rodrigo Marcelli Boaretto
[5]
;
Dirceu de Mattos Júnior
[6]
Total Authors: 6
|
| Affiliation: | [1] Agronomic Institute (IAC), Sylvio Moreira Citriculture Center - Brasil
[2] Agronomic Institute (IAC), Sylvio Moreira Citriculture Center - Brasil
[3] Agronomic Institute (IAC), Sylvio Moreira Citriculture Center - Brasil
[4] Federal University of São Carlos (UFSCar). Department of Rural Development - Brasil
[5] Agronomic Institute (IAC), Sylvio Moreira Citriculture Center - Brasil
[6] Agronomic Institute (IAC), Sylvio Moreira Citriculture Center - Brasil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | Revista Brasileira de Fruticultura; v. 45, 2023-06-02. |
| Abstract | |
Abstract Alternaria brown spot - ABS (Alternaria alternata) causes lesions on fruits, leaves and branches of mandarins. The cost of fungicide application is high and alternative managements for the control need to be studied. We aimed to evaluate calcium (Ca) nutrition to mitigate the effects of ABS. Murcott IAC 221 tangor plants were nourished with calcium nitrate at three different concentrations (30, 150 and 300 mg Ca L-1), and the N content was standardized in the nutrient solution of the treatments (245 mg L-1 of N) with ammonium nitrate. In vitro and in vivo tests were installed, evaluating the severity and area under the disease progress curve (AUDPC), total proteins, peroxidase (POX), catalase (CAT), superoxide dismutase (SOD) and hydrogen peroxide (H2O2), during four times. In all evaluations a negative correlation was observed between leaf Ca content and the severity and AUDPC of ABS. On the other hand, there was a positive correlation between N and the occurrence of the disease. In the treatment with the lowest concentration of calcium there was accumulation of H2O2 and hypersensitivity reaction (HR), with low detoxification of H2O2 by CAT. There is potential for use of calcium supply to plants of Murcott IAC 221 tangor as an alternative management against the fungus A. alternata. (AU) | |
| FAPESP's process: | 12/13917-7 - Copper deficiency and toxicity in Citrus: integrating nutrient absorption and plant nutritional status |
| Grantee: | Franz Walter Rieger Hippler |
| Support Opportunities: | Scholarships in Brazil - Doctorate |