Caracterização de frutos e poliembrionia em sementes de 'flying dragon' e de híbridos de porta-enxerto de citros

Moreira, Rodrigo Amato; Ramos, José Darlan; Cruz, Maria do Céu Monteiro da

doi:10.1590/s0100-29452010005000056

Cited by 15 publications

(16 citation statements)

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“…Os frutos do citrumelo 'Swingle', seguido pelo híbrido LVK x LCR -010, apresentaram maior diâmetro, comprimento e massa, bem como maior número total de sementes (Tabela 2), resultado similar ao encontrado por Moreira et al (2010) na caracterização dos frutos e poliembrionia de sementes de trifoliata 'Flying Dragon' e de portaenxertos híbridos de citros. Os citrandarins 'Indio', 'Riverside' e 'San Diego', e os híbridos HTR -051 e TSKC x (LCR x TR) -059 apresentaram as menores médias para diâmetro, comprimento e massa do fruto.…”

Section: Resultsunclassified

“…Apesar de o trifoliata 'Flying Dragon' ter apresentado baixa taxa de poliembrionia, os resultados aqui observados são superiores aos relatados por Moreira et al (2010) com o mesmo genótipo apresentando 13,4% de poliembrionia. A taxa de poliembrionia é influenciada por diversas condições, como polinização, compatibilidade genética e taxa de fecundação, vigor genético do embrião zigótico, estado nutri cional da planta, além de fatores climáticos, como fotoperíodo e temperatura do ar (MACHADO et al, 2005).…”

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Caracterização De Frutos E Propagação De Porta-Enxertos Híbridos De Citros Em Ambiente Protegido

et al. 2015

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A diversificação de uso de porta-enxertos de citros é importante no Brasil devido à presença de diversos estresses abióticos e bióticos, além da busca por atributos horticulturais desejáveis como nanismo, alta eficiência de produção e indução de boa qualidade aos frutos. Para a seleção de um genótipo com potencial de uso como porta-enxerto, porém, o desempenho na fase de propagação também é relevante. Assim, caracterizaram-se os frutos e avaliou-se a propagação em ambiente protegido de porta-enxertos híbridos de citros obtidos ou selecionados pelo Programa de Melhoramento Genético de Citros da Embrapa: citrandarins ‘Indio’, ‘Riverside’ e ‘San Diego’, híbridos HTR-051, TSKC x (LCR x TR)-040 e 059, LVK x LCR-010 e 038, TSKC x CTTR-002, TSKC x CTSW-041 e LCR x TR-001, além das variedades comerciais citrumelo ‘Swingle 4475’, trifoliata ‘Flying Dragon’, limoeiro ‘Cravo Santa Cruz’ e tangerineira ‘Sunki Tropical’. Foram avaliados variáveis biométricas, fisiológicas e coeficientes técnicos. O delineamento experimental foi em blocos ao acaso, com quatro repetições e 50 plantas na parcela ou 20 frutos por genótipo, conforme a avaliação. Citrumelo ‘Swingle’ e LVK x LCR-010 apresentaram alta produção de sementes por fruto, enquanto HTR-051 e LCR x TR-001 produziram as menores quantidades. A poliembrionia foi superior para TSKC x CTTR-002, TSKC x (LCR x TR)–040, LCR x TR-001, citrandarins ‘Indio’, ‘Riverside’ e ‘San Diego’ e tangerineira ‘Sunki Tropical’, tendo trifoliata ‘Flying Dragon’ e LVK x LCR-010 apenas 45% de poliembrionia média. A emergência de citrandarin ‘Riverside’ foi mais rápida e uniforme em relação aos demais genótipos. O crescimento vegetativo da parte aérea e do sistema radicular foi superior para citrandarin ‘Riverside’, TSKC x (LCR x TR)-059, tangerineira ‘Sunki Tropical’, citrumelo ‘Swingle’ e limoeiro ‘Cravo’ e seus híbridos. Todos os híbridos de citros avaliados apresentam potencial de uso como porta-enxertos.

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Section: Resultsunclassified

Caracterização De Frutos E Propagação De Porta-Enxertos Híbridos De Citros Em Ambiente Protegido

et al. 2015

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“…The integument is considered the main limiting factor for seed germination of these rootstocks, which possibly have low germination due to low water absorption, or loss of seeds caused by the long period that they remain in contact with the substrate. Significant increase in seed emergence of hybrid rootstock from P. trifoliata has been achieved with the removal of the seed coat by Moreira et al (2010).…”

Section: Resultsmentioning

confidence: 99%

“…This behavior was observed in 'Flying Dragon' (P. trifoliata var. monstrosa) and hybrids of P. trifoliata, both used as citrus rootstocks (Moreira et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…The main rootstock used in Brazil in recent years, 'Rangpur' lime (Citrus limonia Osbeck), has proved susceptible to serious disease problems (Moreira et al, 2010), such as the citrus sudden death (CSD), disease associated with a virus (Maccheroni et al, 2005). Therefore, the need to diversify the use of rootstocks has *Corresponding author.…”

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confidence: 99%

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Hydrogel polymer in emergency and early growth of citrus rootstocks

Fagundes¹,

Camilo²,

Soares³

et al. 2014

Afr. J. Agric. Res.

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The development of techniques for rapid and uniform emergence of seeds is the alternative to the diversification of citrus rootstocks that were little used due to low vigor compared to 'Rangpur' lime, the main rootstock used in Brazil, but it has shown susceptible to serious disease problems, such as the citrus sudden death (CSD). The addition of the hydrogel polymer to the substrate can increase the uniformity of seed emergence and reduce the time for the production of rootstocks due to the increase in water availability. Thus, the study was done to evaluate the formulation of the substrate with the hydrogel polymer on the uniformity of emergence and early growth of citrus rootstocks. The factorial scheme 3 × 2 × 2 was used, with the factors: Three rootstocks ['Rangpur' lime (Citrus limonia Osbeck), Poncirus trifoliata (L.) and 'Sunki' mandarin (Citrus sunki Hort. ex Tanaka); two formulations of substrate (with and without 0.4 g per container of Hidroplan-EB/HyB-M ® polymer and two environments (greenhouse with an average maximum temperature of 36.6°C and minimum of 17.2°C and growth chamber programmed with temperature to 25°C and a photoperiod of 12 h, distributed in a completely randomized design with four replications and 35 seeds per plot. The emergency velocity index (EVI), the percentage of emergence and early growth of rootstocks were evaluated. Data were subjected to analysis of variance and the means were compared by Tukey test at 5% of probability. The addition of the polymer to the substrate favored the percentage of emergence and EVI of 'Rangpur' lime and of mandarin 'Sunki' seeds in the growth chamber. The 'Rangpur' lime was the rootstock which presented the highest percentage of emergence and uniformity in both environments. The addition of the hydrogel polymer to substrate favored initial growth of citrus rootstocks.

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Impact of HLB on the physiological quality of citrus rootstock seeds and non-vertical ‘Candidatus Liberibacter asiaticus’ transmission

Morelli¹,

Takayassu²,

Pacheco³

et al. 2020

Trop. plant pathol.

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Huanglongbing (HLB) is the main disease of citriculture worldwide, being mainly caused by the bacterium known as 'Candidatus Liberibacter asiaticus' (CLas), limited to the phloem and naturally transmitted by vector insects known as psyllids. For the production of citrus seedlings, it is necessary to use rootstocks that are propagated by seeds from fruits produced by mother plants grown in field, however being submitted to natural HLB transmission. Although there is no evidence of CLas transmission from seeds to seedlings, little is known about the effects of this bacterium on the physiological quality of seeds obtained from CLas-infected plants. Therefore, the aim of this work was to evaluate the physiological quality of seeds from 'Rangpur' lime and 'Swingle' citrumelo rootstocks, from CLas-infected plants, with symptomatic and asymptomatic branches. The parameters evaluated, in addition to fruit development in mother plants, were germination rate, tetrazolium test, electrical conductivity, seedling emergence in greenhouse, and vegetative development and molecular analysis via qPCR for the detection of bacteria (leaf petiole, fruit peduncles, roots, seed coats, and seed endosperm). The presence of CLas in plants of both rootstocks has negative impact on fruit development, as well as on the number of normal seeds. In addition, there is reduced germination and seed emergence. Although CLas was detected in different tissues (leaf petiole, fruit peduncles and seed coat, and seed embryo), no vertical bacteria transmission was detected. Results have shown that seeds from CLas-infected branches have impaired physiological quality, but without bacterial transmission from seeds to seedlings.

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Caracterização de frutos e poliembrionia em sementes de 'flying dragon' e de híbridos de porta-enxerto de citros

Cited by 15 publications

References 9 publications

Caracterização De Frutos E Propagação De Porta-Enxertos Híbridos De Citros Em Ambiente Protegido

Caracterização De Frutos E Propagação De Porta-Enxertos Híbridos De Citros Em Ambiente Protegido

Hydrogel polymer in emergency and early growth of citrus rootstocks

Impact of HLB on the physiological quality of citrus rootstock seeds and non-vertical ‘Candidatus Liberibacter asiaticus’ transmission

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