FRUIT GROWTH OF CITRUS SINENSES (OSBECK) ORANGE TREES WITH HLB, SUBMITTED TO FOLIAR NUTRITION AND BIOREGULATORS.

Camilo Lázaro Medina; Paulo Roberto de Camargo e Castro; Ricardo Silverio Machado

All Papers

Submission

Paper Title

FRUIT GROWTH OF CITRUS SINENSES (OSBECK) ORANGE TREES WITH HLB, SUBMITTED TO FOLIAR NUTRITION AND BIOREGULATORS.

Authors

Camilo Lázaro Medina
Paulo Roberto de Camargo e Castro
Ricardo Silverio Machado

Modality

Abstract

Subject area

Plant Physiology

Publishing Date

26/09/2022

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/cbfv2022_registration/516110-fruit-growth-of-citrus-sinenses-(osbeck)-orange-trees-with-hlb-submitted-to-foliar-nutrition-and-bioregulators

ISBN

978-65-5941-830-5

Keywords

Citrus greening; Mineral nutrition; Plant regulators, Citrus recovery

Summary

Citrus greening or Huanglongbing (HLB) is caused by the phloem-limited intracellular Gram-negative bacterium Candidatus Liberibacter asiaticus (CLas) has a serious impact on Brazilian Citrus Industry. CLas promotes phloem dysfunction, root death, impairing nutrition and hormonal balance. In order to study how foliar fertilization and bioregulators affect disease severity and fruit mass, three-year-old 'Lima Verde' orange trees (Citrus sinensis, Osbeck) infected with HLB (PCR+) with symptomatic and asymptomatic branches, were submitted for two years to monthly applications of nutrient solution and bioregulators. The solution consisted of N, P, K, Ca, Mg, B, Cu, Zn, Mn, Fe, Mo and Ni at concentrations of 140, 60, 30, 140, 20, 36; 1.26, 3.63, 1.26, 0.18, 0.17 and 1.9 mg L-1; and GA3, 5 mg L-1 and 2,4-D 4 mg L-1 bioregulators, in addition to healthy (PCR-) and diseased (PCR+) controls. To establish the dry mass of the fruits, 5 fruits of 4 replicates were randomly taken at four times, from fixation to maturation. The severity of HLB was evaluated by the % of the crown affected by symptoms of the disease. Data were submitted to analysis of variance and means were compared by Tukey's test (p<0.05). Disease severity was reduced by bioregulators. These partially benefited the fruit dry matter gain in symptomatic branches. The isolated application of nutrients benefited only the severity, without altering the fruit growth. The association of bioregulators and nutrition allowed growth in a similar way to healthy control and greatly reduced the severity of the disease.

Title of the Event: XVIII Brazilian Congress of Plant Physiology and I Ibero-latinoamerican Congress of Plant Biology
City of the Event: Porto Alegre
Title of the Proceedings of the event: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology
Name of the Publisher: Even3
Means of Dissemination: Meio Digital

How to cite

MEDINA, Camilo Lázaro; CASTRO, Paulo Roberto de Camargo e; MACHADO, Ricardo Silverio. FRUIT GROWTH OF CITRUS SINENSES (OSBECK) ORANGE TREES WITH HLB, SUBMITTED TO FOLIAR NUTRITION AND BIOREGULATORS... In: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology. Anais...Porto Alegre(RS) CEPUCRS, 2022. Available in: https//www.even3.com.br/anais/cbfv2022_registration/516110-FRUIT-GROWTH-OF-CITRUS-SINENSES-(OSBECK)-ORANGE-TREES-WITH-HLB-SUBMITTED-TO-FOLIAR-NUTRITION-AND-BIOREGULATORS. Access in: 06/07/2025