Declínio dos citros: algo a ver com o sistema de produção de mudas cítricas?

Baldassari, Ricardo Braga; Goes, António de; Tannuri, Fernando

doi:10.1590/s0100-29452003000200047

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…According to Baldassari, Goes, and Tannuri (2003), the ideal situation would be a straight and undivided taproot of citrus plants, at least up to the length of the plastic bags where seedlings are grown after transplanting the rootstock, because citrus seedlings with root malformation have limited growth of the root system to greater soil depths, when planted in the field, even if soil chemical and physical conditions are favorable. Thus, the selection in the nursery may have contributed to the greater performance of the citrus seedling in the field, highlighting the importance of seedling quality in orchard establishment.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the taproot system loses dominance and is replaced by a fasciculated root system, which tends to concentrate in the superficial horizons, contributing to orchard vulnerability to environmental adversities (Rezende, 2011). Such practice, according to Baldassari, Goes, and Tannuri (2003), entails a severe morphological deformation of the root system in citrus seedlings, reducing their growth potential after field transplanting. The low quality of nursery plants could be related to the serious problems associated with the proper selection of plants in the nursery, for example, the need for discarding the zygotic seedlings to guarantee the genetic potential of rootstock variety and discarding seedlings with root malformation.…”

Section: Introductionmentioning

confidence: 99%

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Subsoiling and Planting Method on the Initial Growth of ‘Pera’ Sweet Orange (Citrus sinensis (L.) Osbeck)

Meneses¹,

Filho²,

Filho³

et al. 2019

JAS

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The objective of this work was to evaluate the vegetative vigor and root architecture of ‘Pera CNPMF D-6’ sweet orange grafted on Rangpur lime at early stage of development, submitted to different planting methods (planting of nursery trees produced in a protected environment-PNT and planting of seeds at the definitive place-PS) and soil preparation with and without subsoiling. The experiment was carried out at the Lagoa do Coco Farm, Rio Real, Bahia, Brazil. Biometric evaluations were performed to estimate the variables: canopy volume (CV), vegetative vigor index (VVI) and canopy cover rates in the planting row (CCR-R) and interrow (CCR-I). Root samples were also collected up to a depth of 1.45 m at five points in the planting row. The roots were digitized and processed to obtain total root length (TRL), root length density (RLD), average root diameter (RD) and root length for the diameter classes. Plants produced in protected environment exhibit greater shoot vegetative and root development compared to those produced by sowing at the definitive place, at least for the young orchard and under rainfed conditions. Subsoiling did not affect root system distribution and PNT favored the increase in TRL along the soil profile compared to PS, for all diameter classes evaluated, contributing to the increase in vegetative vigor observed in the plants. Regardless of the management practices adopted, roots were concentrated in the first 0.35 m of the vertical soil profile, due to physical impediment caused by the presence of cohesive horizons.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subsoiling and Planting Method on the Initial Growth of ‘Pera’ Sweet Orange (Citrus sinensis (L.) Osbeck)

Meneses¹,

Filho²,

Filho³

et al. 2019

JAS

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“…Plantas enxertadas sobre a tangerineira 'Cleópatra', por exemplo, não apresentam sintomas de morte súbita (GimenesFernandes & Bassanezi, 2001) nem declínio dos citros (Beretta & Lefevre, 1986;Baldassari et al, 2003); além disto, o portaenxerto desta cultivar apresenta compatibilidade para um grande número de variedades comerciais de citros . Entretanto, a tangerineira 'Cleópatra' (C. reshni) tem crescimento lento, o que constitui um entrave durante a fase de viveiro (Esposti & Siqueira, 2004).…”

Section: Introductionunclassified

Brassinosteroide e fungo micorrízico arbuscular na produção do porta-enxerto tangerineira ‘Cleópatra’

Freitas

Marinho

Freitas

et al. 2015

Agraria

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RESUMOTanto o brassinosteroide quanto a inoculação com fungos micorrízicos arbusculares (FMA) favorecem o crescimento e a absorção de nutrientes pelas plantas. Entretanto, não há relatos de experimentos testando a combinação desses insumos em mudas de Citrus reshni (tangerineira 'Cleópatra'). Assim, o objetivo deste trabalho foi avaliar o efeito da aplicação desses dois insumos sobre o crescimento e o estado nutricional de mudas de tangerineira 'Cleópatra', na fase final do enviveiramento. O experimento foi conduzido em delineamento casualizado em blocos, com esquema fatorial 5 x 2, sendo cinco concentrações de brassinosteroide (0,0; 0,1; 0,5; 0,75 e 1,00 mg L -1 ) e dois tratamentos de FMA (sem inoculação e inoculado com Acaulospora scrobiculata Trappe), com quatro repetições. Foram avaliados parâmetros de crescimento como altura, número de folhas e diâmetro do caule, a cada 20 dias após o transplantio das mudas e, ao final da fase de enviveiramento, a área foliar, a matéria seca da parte aérea e das raízes e o estado nutricional das mudas. O brassinosteroide não proporcionou efeito para as características de crescimento das mudas. A simbiose com A. scrobiculata promoveu aumento na altura no número de folhas, no conteúdo e no teor de Fe e Mn na massa seca das folhas de mudas de tangerineira 'Cleópatra'. Palavras-chave: Acaulospora, Citrus reshni, nutrição de plantas, propagação de plantas Brassinosteroid and arbuscular mycorrhizal fungi in the production of rootstock 'Cleopatra' ABSTRACTThe brassinosteroid belong to the class of plant hormone with diverse effects on plant physiology, including effects on growth and nutritional status. Allied to this substance, inoculation with mycorrhizal fungi can enhance growth and nutrient uptake in plants grown in containers. The objective of this study was to evaluate the effect of brassinosteroid and inoculation with arbuscular mycorrhizal fungi (AMF) on growth and nutritional status of Citrus reshni ('Cleopatra') at the stage of transplanting the tubes to pots. The experiment was conducted in a randomized block design in a 5 x 2 factorial arrangement with five doses of brassinosteroid (0.0; 0.1; 0.5; 0.75 and 1.00 mg L -1 ) and two AMF of treatments (without inoculation and inoculated with Acaulospora scrobiculata Trappe) with four replications. We evaluated the growth (height, number of leaves and stem diameter) every 20 days after transplanting of seedlings and at the end of the experiment (130 days after transplant) was assessed leaf area, shoot dry matter of roots and nutritional status of the plants. The brassinosteroid provided no effect on the characteristics of seedling growth. Inoculation with A. scrobiculata increased the height, number of leaves, the content and the content of Fe and Mn in the leaf dry weight of 'Cleopatra'.

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“…The citrus blight is an alteration in the normal development of the plant, characterized by accentuated loss of leaves, excess branches and shoots on the trunk, gradual drying of branches, unseasonal flowering, accentuated nutrient deficiencies, accumulation of soluble phenols in the stem, presence of amorphous and/ or filamentous obstructions in the xylem vessels and low production (Baldassari;Goes;Tannuri, 2003;Auler et al, 2011). The affected plants rarely die, but they become economically unviable due to low amount and quality of the produced fruits.…”

Section: Introductionmentioning

confidence: 99%

IDENTIFICATION AND QUANTIFICATION OF DIFFERENTIALLY EXPRESSED GENES ASSOCIATED WITH CITRUS BLIGHT (Citrus spp.)

et al. 2015

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Brazil is the largest citrus producer in the world, being responsible for more than 20% of its production, which is, however still low due to phytosanitary issues such as citrus blight. Citrus blight is an anomaly whose causes still have not yet been determined, therefore there are no efficient control measures to minimize the production losses with the use of resistant varieties being considered the most appropriate method. However, little is known about the genes involved in the defense response of the plants to this anomaly. Considering that many physiological alterations associated with plant stress responses are controlled at a transcriptional level, in this study we sought the identification and characterization of the gene expression products differentially expressed in the response to the citrus blight. Through the suppressive subtractive hybridization technique, expressed cDNA libraries were built using mRNAs isolated from "Cravo" lemon tree roots (Citrus limonia L. Osbeck) under "Pera" orange (Citrus sinensis L. Osbeck) of healthy and sick plants. 129 clones were obtained by subtraction and their sequences were compared in databases. 34 of them linked to proteins associated to stress processes, while the others were similar to sequences of unknown functions or did not present similarity with sequences deposited in the databases. 3 genes were selected and their expressions were studied by RT -qPCR in real-time. Plants with citrus blight presented an increase of the expression level in two of those genes, suggesting that these can be directly involved with this anomaly.Index terms: Differential gene expression, subtractive hybridization, RT-qPCR. RESUMOO Brasil é o maior produtor de citros do mundo, sendo responsável por mais de 20% de sua produção. No entanto, a produção ainda é baixa, em decorrência de problemas fitossanitários, como o Declínio do Citros que é uma anomalia cuja causa ainda não foi determinada e, consequentemente, não existem medidas de controle para minimizar as perdas na produção. O uso de variedades resistentes é considerado como a medida de controle mais adequada. Contudo, pouco se conhece sobre os genes envolvidos na resposta de defesa das plantas a essa anomalia. Considerando que muitas alterações fisiológicas associadas com respostas a estresses em plantas são controladas em nível transcripcional, neste estudo objetivou-se a identificação e caracterização dos produtos de expressão gênica diferencialmente expressos na resposta ao Declínio dos Citros. Por meio da técnica de hibridação subtrativa supressiva, bibliotecas de cDNAs expressos foram construídas utilizando mRNAs isolados de raízes de limoeiro "Cravo" (Citrus limonia L. Osbeck) sob laranja "Pera" (Citrus sinensis L. Osbeck) de plantas sadias e doentes. Cento e vinte e nove clones foram obtidos por subtração e suas sequências foram comparadas em bancos de dados. Trinta e quatro delas relacionaram-se a proteínas associadas a processos de estresses, enquanto as outras foram similares a sequências de funções desconheci...

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Declínio dos citros: algo a ver com o sistema de produção de mudas cítricas?

Cited by 10 publications

References 3 publications

Subsoiling and Planting Method on the Initial Growth of ‘Pera’ Sweet Orange (Citrus sinensis (L.) Osbeck)

Subsoiling and Planting Method on the Initial Growth of ‘Pera’ Sweet Orange (Citrus sinensis (L.) Osbeck)

Brassinosteroide e fungo micorrízico arbuscular na produção do porta-enxerto tangerineira ‘Cleópatra’

IDENTIFICATION AND QUANTIFICATION OF DIFFERENTIALLY EXPRESSED GENES ASSOCIATED WITH CITRUS BLIGHT (Citrus spp.)

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