Influência da posição das miniestacas na qualidade de mudas de cedro australiano e no seu desempenho inicial no pós-plantio

Ferreira, Daniele de Alvarenga; Barroso, Déborah Guerra; Silva, Mírian Peixoto Soares da; Souza, Juliana Sobreira de; Freitas, Teresa Aparecida Soares de; Carneiro, José Geraldo de Araújo

doi:10.5902/198050987553

Cited by 15 publications

(16 citation statements)

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“…These findings resemble those reported by Silva et al (2012) for Australian cedar saplings originated from minicuttings in the same systems. In the last production cycle, we observed reductions of 43.6% and 17.3% in the number and length, respectively, of adventitious roots in comparison to saplings from the third cycle (Table 1).…”

Section: Resultssupporting

confidence: 90%

“…The forestry team at UENF has long focused on the vegetative propagation of Australian cedar by minicuttings, and has demonstrated the potential and viability of this technique in numerous works developed by Moraes (2008), Souza et al (2009), Ferreira et al (2012, Silva et al (2012) and Souza et al (2014). In this body of work, minicuttings were derived from ministumps grown from seeds.…”

Section: Introductionmentioning

confidence: 99%

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Growth and quality of australian cedar saplings originated from different multiclonal minigarden systems

Silva

Barroso

Souza

et al. 2016

SCA

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Forestry researchers often evaluate minicutting vegetative propagation of Australian cedar (Toona ciliata) as a viable technique for this species. However, the adoption of minigarden systems for commercial propagation still requires viability and quality testing of saplings produced after multiple harvests. In the present work, we evaluate survival, growth, and quality of Australian cedar saplings grown from minicuttings originating from multiple harvests of ministumps planted in gutter or tube systems. Experiments were conducted in a greenhouse using a completely randomized design with a 2 × 4 factorial treatment structure (two minigarden systems and four minicutting harvests). For the gutter system, six minicutting harvests were performed 50, 86, 115, 149, 177 and 212 days after planting ministumps, whereas for the tube system, four harvests were performed 115, 149, 177 and 212 days after planting ministumps. At the end of each sapling production cycle (105 days after each minicutting harvest), saplings were evaluated for survival, foliar area, dry mass of aerial parts, number and length of adventitious roots, dry mass of the root system, height to diameter ratio, ratio between the dry mass of aerial parts and dry mass of root system, and Dickson's Quality Index. Sapling survival was not affected by minigarden system, except for a reduction observed in fourth cycle saplings from the tube system. Sapling quality was also similar between systems. However, sapling growth potential decreased with production cycle, indicating that ministumps lose vigor with multiple harvests. Key words: Minicuttings. Sapling quality. Toona ciliata. ResumoA propagação vegetativa por miniestaquia do cedro australiano (Toona ciliata) tem sido alvo de pesquisas, mostrando ser uma técnica viável para esta espécie. Entretanto, para a adoção de sistemas de minijardins em canaletão e em tubetes na propagação comercial, ainda é necessário testar a qualidade das mudas produzidas ao longo de colheitas sucessivas. Objetivou-se com este trabalho avaliar a sobrevivência, o crescimento e a qualidade de mudas de cedro australiano, produzidas por miniestacas, obtidas de minicepas manejadas em sistemas de canaletões e em tubetes, ao longo das colheitas sucessivas. O experimento foi conduzido em casa de vegetação em delineamento inteiramente casualizado em esquema fatorial 2x4 (dois sistemas de minijardins e quatro colheitas de miniestacas). No sistema em canaletão foram realizadas seis colheitas de miniestacas aos 50, 86, 115, 149, 177 e 212 dias após recepagem e quatro no sistema em tubetes aos 115, 149, 177 e 212 dias após recepagem. Ao final de cada ciclo de produção (105 dias a partir de cada colheita), as mudas foram avaliadas quanto à sobrevivência, área foliar, massa seca da parte aérea, número e comprimento das raízes adventícias, massa seca do sistema radicular, as relações entre a altura e o diâmetro, massa seca da parte aérea e a massa seca das raízes e o Índice de Qualidade de Dickson. A sobrevivência das mudas não foi afetada pe...

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Growth and quality of australian cedar saplings originated from different multiclonal minigarden systems

Silva

Barroso

Souza

et al. 2016

SCA

Self Cite

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“…Between species of highgrade timber, there are few studies on the subject. In Brazil, the Australian cedar crop has gained popularity as it is well adapted to edafoclimatic conditions, and has a high timber potential (FERREIRA et al, 2012), adapting best in areas with an annual rainfall equal to or greater than 1,100 mm, and in frost-free areas with good drainage. A cedar crop can be established at low or high altitudes (up to 1,700 m), being more sensitive to higher altitudes (LORENZI et al, 2003;SOUZA;BARROSO;CARNEIRO, 2010).…”

Section: Introductionmentioning

confidence: 99%

Root Morphology and Nutrient Uptake Kinetics by Australian Cedar Clones

et al. 2016

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-Evaluation of root morphology and kinetic parameters assist in the characterization of genotypes in nutrient uptake efficiency. This study characterized Australian cedar clones concerning their nutrient uptake capacity at the seedling stage through root morphology and the kinetics of P, K, Ca, and Mg uptake. The experiment was conducted using a nutrient solution in a greenhouse and growth chamber. Four Australian cedar clones (HE, XF, XD, and XE), provided by Bela Forest View (Empresa Florestal Bela Vista), were tested using a completely randomized design with five repetitions, totaling 20 experimental plots. The length, volume, surface area, average diameter, and root length per diameter class, as well as the uptake parameters V max , K m , C min , and the estimated inflow of P, K, Ca, and Mg, were determined. The root morphological characteristics varied between Australian cedar clones; clone XD exhibited the largest root system development. The uptake efficiency of P, K, Ca, and Mg varied between cedar Australian clones. When availability differed, clones XE and XF exhibited greater plasticity in the uptake of P and K respectively, and similar results were found for clone HE in the uptake of Ca and Mg.Keywords: Morphological attributes of root systems. Kinetic parameters. Inflow of P, K, Ca, and Mg. Nutrient uptake. Toona ciliata. MORFOLOGIA RADICULAR E CINÉTICA DE ABSORÇÃO DE NUTRIENTES POR CLONES DECEDRO-AUSTRALIANO RESUMO -Avaliações da morfologia radicular e de parâmetros cinéticos auxiliam na caracterização de genótipos quanto à eficiência de absorção de nutrientes. O objetivo deste trabalho foi caracterizar clones de cedro-australiano quanto à capacidade de absorção de nutrientes na fase de muda, por meio da determinação de características morfológicas radiculares e dos parâmetros cinéticos de absorção de P, K, Ca e Mg. O experimento foi conduzido em solução nutritiva em casa de vegetação e câmara de crescimento. Foram testados quatro clones de cedro-australiano (HE, XF, XD e XE), provenientes da empresa Bela Vista Florestal, sendo utilizado o delineamento inteiramente casualizado com cinco repetições, totalizando em vinte parcelas experimentais. Determinou-se o comprimento, volume, área superficial, diâmetro médio e extensão de raízes por classes de diâmetro, bem como os parâmetros de absorção Vmax, Km, Cmin e o influxo estimado para P, K, Ca e Mg. As características morfológicas radiculares variam entre os clones de cedro-australiano, tendo destaque para o clone XD que apresentou um maior desenvolvimento do sistema radicular. A eficiência de absorção de P, K, Ca e Mg varia entre os clones de cedro-australiano. Em condições de variações na disponibilidade, os clones XF e XE apresentam maior plasticidade na absorção de P e K, respectivamente, e o clone HE na absorção de Ca e Mg. Palavras-chave:Atributos morfológicos do sistema radicular. Parâmetros cinéticos. Influxos de P, K, Ca e Mg.Absorção de nutrientes. Toona ciliata.

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“…So, it is necessary to fertilize minigardens, to keep high productivity levels of ministumps along the collects. Ferreira et al (2012) studied Toona ciliata in a duct channel system and observed an initial reduction in the sprout growth of the ministumps. The author observed a recovery of the minigarden after applying a nutrient solution.…”

Section: The Productivity Of the Multiclonal Minigardenmentioning

confidence: 99%

Productivity of polyclonal minigarden and rooting of Handroanthus heptaphyllus Mattos minicuttings

et al. 2015

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Aiming the improvement of the quality of techniques related to the growth of "ipê-roxo" cuttings, this study had as objective to evaluate the productivity of Handroanthus heptaphyllus Mattos ministumps and the rooting capacity of the minicuttings in successive collections in the presence and absence of exogenous auxin. Seedlings were grown in 280 cm 3 tubes with selected different sources of seeds. At 141 days after the sowing, seedlings were pruned at 8 cm from the collar with the goal to establish the minigarden. The productivity of ministumps over successive collections as well as the need to apply indol-3-butiric acid on the roots of the minicuttings were evaluated. Eight collects of minicuttings were carried out, at three, five, six, seven, eight, nine, 10 and 11 months after the pruning. In each of those cycles the number of minicuttings were quantified per mini-stump. Before their staking in 180 cm 3 tubes, half of the minicuttings from each cycle were treated with 8000 mg L -1 of Indole-3-Butiric Acid (IBA) (2 seconds). The ministumps tolerated the pruning (with 100% survival); over 70% of the ministumps produced minicuttings along all the time in each collection cycle. A cyclical behavior in the minigarden was observed with higher productivities of the ministumps at 8 and 11 months after pruning of seedlings. The use of IBA stimulated more robust root systems of the cuttings, although this was not a condition for rooting. Key words: Ministumps, indol-3-butiric acid, ipê-roxo ResumoNo intuito de aprimorar as técnicas para a produção de mudas de ipê-roxo, visando à qualidade, este estudo tem como objetivo avaliar a produtividade de minicepas de Handroanthus heptaphyllus Mattos e a capacidade de enraizamento das miniestacas em coletas sucessivas na presença e na ausência de auxina exógena. As plântulas produzidas a partir de sementes foram cultivadas em tubetes de 280 cm 3 . Aos 141 dias após a semeadura, as mudas foram podadas a 8 cm da base, com o objetivo de estabelecer o minijardim. A produtividade das minicepas em sucessivas coletas, bem como a necessidade de se aplicar o ácido indol-3-butírico no enraizamento das miniestacas foram avaliadas. Oito coletas de miniestacas foram realizadas, em três, cinco, seis, sete, oito, nove, 10 e 11 meses após a poda. Em cada um destes ciclos, o número de miniestacas foi quantificado por minicepa. Antes do estaqueamento em tubetes de 180 cm 3 , metade das miniestacas de cada ciclo foi tratada com 8000 mg L -1 de ácido indol-3-butírico (AIB) por 2 segundos. As minicepas toleraram a poda (com 100% de sobrevivência), mais de 70% das minicepas produziram miniestacas ao longo do tempo em cada ciclo de coleta. Um comportamento cíclico no minijardim foi observado com maiores produtividades das minicepas aos 8 e 11 meses após a poda das mudas. O uso de AIB estimulou sistemas radiciais mais robustos nas miniestacas, embora esta não seja uma condição para o enraizamento. Palavras-chave: Minicepa, ácido indolbutírico, ipê-roxo

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Influência da posição das miniestacas na qualidade de mudas de cedro australiano e no seu desempenho inicial no pós-plantio

Cited by 15 publications

References 1 publication

Growth and quality of australian cedar saplings originated from different multiclonal minigarden systems

Growth and quality of australian cedar saplings originated from different multiclonal minigarden systems

Root Morphology and Nutrient Uptake Kinetics by Australian Cedar Clones

Productivity of polyclonal minigarden and rooting of Handroanthus heptaphyllus Mattos minicuttings

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