Copper supply and fruit yield of young Citrus trees: fertiliser sources and application methods

Hippler, Franz Walter Rieger; Boaretto, Rodrigo Marcelli; Teixeira, Luiz Antônio Junqueira; Quaggio, J. A.; Mattos, Dirceu

doi:10.1590/1678-4499.2017125

Cited by 8 publications

(3 citation statements)

References 16 publications

(22 reference statements)

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“…This phytotoxicity effect caused leaf chlorosis and necrosis of the leaf blade edge and severe leaf fall. Similar phytotoxicity symptoms caused by salt accumulation in leaf tissue were observed with copper nitrate applied via foliar application in young citrus trees in the eld (Hippler et al 2018a) and with copper sulfate in non-bearing trees under greenhouse conditions (Hippler et al 2018b). For this reason, during the entire course of this study, the Zn dose in the treatment with nitrate applied via foliar spray was maintained at 2.0 kg ha − 1 year − 1 , whereas the dose of Zn applied with the other fertilizer sources was twice this amount in the last year.…”

Section: )supporting

confidence: 63%

Zinc fertilizers for Citrus production: assessing nutrient supply via fertigation or foliar application

Boaretto¹,

Hippler²,

Teixeira

et al. 2023

Plant Soil

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Background and AimsCitrus trees are severely affected by zinc (Zn) de ciency, which impairs plant growth and fruit yield. Zn fertilization is usually recommended in eld orchards, and application strategies toward nutrient use e ciency are key for successful crop management. MethodsField studies were carried out with sweet orange trees for four growing seasons, testing Zn (nitrate, sulfate or EDTA) applied either via fertigation or foliar spray compared to a control without Zn. ResultsThe Zn concentrations in the soil increased with nutrient supply by both application methods. Zn-EDTA via fertigation increased soil nutrient availability compared to the control. Likewise, Zn-nitrate via foliar application also increased soil Zn levels. Regarding the plant, Zn-EDTA via fertigation increased leaf nutrient levels only after the third year of fertilization, whereas Zn-nitrate via foliar spray increased leaf levels in the short term, up to 120 mg kg − 1 . To a lesser extent, Zn-EDTA or sulfate also increased leaf Zn compared to the control. Accumulated fruit yield was ~ 20% higher in trees with Zn-EDTA via fertigation and ~ 20% higher in trees with Zn-nitrate or sulfate via foliar application compared to the control, with these latter exerting greater responses. Trees supplied with Zn exhibited lower H 2 O 2 and higher CAT activity compared to the control, which correlated with a fruit yield increase. ConclusionIn conclusion, Zn-EDTA via fertigation or nitrate or sulfate via foliar application improved the horticultural performance of trees, supporting the establishment of best nutrient management practices in fruit production.

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Section: )supporting

confidence: 63%

Zinc fertilizers for Citrus production: assessing nutrient supply via fertigation or foliar application

Boaretto¹,

Hippler²,

Teixeira

et al. 2023

Plant Soil

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“…Cu is poorly mobile in the phloem. Its application is recommended during periods of new vegetative growth ( Marschner, 2012 ; Hippler et al, 2017 ) and should be regularly applied as foliar and ground fertilizer ( Hippler et al, 2018 ). Cu is an important cofactor for many enzymes such as superoxide dismutase, amino oxidase, laccase, blue copper protein, and plastocyanin, but it also plays an important role for the transcription of protein trafficking machinery and oxidative phosphorylation ( Yruela, 2005 , 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Transcriptomic Response of Huanglongbing-Infected Citrus sinensis Following Field Application of a Microbial Fermentation Product

et al. 2021

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Huanglongbing (HLB) is considered the most destructive disease in Citrus production and threatens the future of the industry. Microbial-derived defense elicitors have gained recognition for their role in plant defense priming. This work assessed a 5% (V/V) microbial fermentation application (MFA) and its role in the elicitation of defense responses in HLB-infected Citrus sinensis trees following a foliar application with a pump sprayer. Using a PCR detection method, HLB infection levels were monitored in healthy and infected trees for 20months. Nutrient analysis assessed N, P, K, Ca, Mg, Mn, Zn, Fe, B, and Cu concentrations in the trees. MFA significantly increased Cu concentrations in treated trees and resulted in the stabilization of disease index (DI) in infected trees. Initial real-time qPCR analysis of defense-associated genes showed a significant increase in pathogenesis-related protein 2 (PR2) and phenylalanine ammonia lyase (PAL) gene expression in healthy and HLB-infected trees in response to MFA. Gene expression of PR2 and PAL peaked 6h post-microbial fermentation application during an 8-h sampling period. A transcriptomic assessment using GeneChip microarray of the hour 6 samples revealed differential expression of 565 genes when MFA was applied to healthy trees and 909 genes when applied infected citrus trees when compared to their respective controls. There were 403 uniquely differentially expressed genes in response to MFA following an intersectional analysis of both healthy and infected citrus trees. The transcriptomic analysis revealed that several genes associated with plant development, growth, and defense were upregulated in response to MFA, including multiple PR genes, lignin formation genes, ROS-related genes, hormone synthases, and hormone regulators. This study provides further evidence that MFA may play an important role as a plant elicitor in an integrated pest management strategy in citrus and other agronomically important crops.

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“…Due to all of the above, there is an urgent need to modify and improve commercial copper fertilizers. Current investigations are mainly focused on developing a new generation of enhanced agroformulations based on copper more efficiently than traditional fertilizers thus reducing environmental pollution [ 8 , 9 , 10 , 11 ]. Various chelate complexes are used in agricultural practice due to their biocidal activity toward some fungi and bacteria and as a supplier of essential microelements to the plants [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of Synthesized Plant Growth Regulator Based on Copper(II) Complex in Chitosan/Alginate Microcapsules

Kudasova

Mutaliyeva

Vlahoviček-Kahlina

et al. 2021

IJMS

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A new copper complex, trans-diaqua-trans-bis [1-hydroxy-1,2-di (methoxycarbonyl) ethenato] copper (abbreviation Cu(II) complex), was synthesized and its plant growth regulation properties were investigated. The results show a sharp dependence of growth regulation activity of the Cu(II) complex on the type of culture and its concentration. New plant growth regulator accelerated the development of the corn root system (the increase in both length and weight) but showed a smaller effect on the development of the wheat and barley root systems. Stimulation of corn growth decreased with increasing Cu(II) complex concentration from 0.0001% to 0.01% (inhibition at high concentrations—0.01%). The development of corn stems was also accelerated but to a lesser extent. Chitosan-coated calcium alginate microcapsules suitable for delivery of Cu(II) complex to plants were prepared and characterized. Analysis of the FTIR spectrum showed that complex molecular interactions between functional groups of microcapsule constituents include mainly electrostatic interactions and hydrogen bonds. Microcapsules surface exhibits a soft granular surface structure with substructures consisting of abundant smaller particles with reduced surface roughness. Release profile analysis showed Fickian diffusion is the rate-controlling mechanism of Cu(II) complex releasing. The obtained results give new insights into the complexity of the interaction between the Cu(II) complex and microcapsule formulation constituents, which can be of great help in accelerating product development for the application in agriculture

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Copper supply and fruit yield of young Citrus trees: fertiliser sources and application methods

Cited by 8 publications

References 16 publications

Zinc fertilizers for Citrus production: assessing nutrient supply via fertigation or foliar application

Zinc fertilizers for Citrus production: assessing nutrient supply via fertigation or foliar application

Transcriptomic Response of Huanglongbing-Infected Citrus sinensis Following Field Application of a Microbial Fermentation Product

Encapsulation of Synthesized Plant Growth Regulator Based on Copper(II) Complex in Chitosan/Alginate Microcapsules

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