Crescimento inicial de Dalbergia nigra (Vell.) Allemão ex. Benth. (Fabaceae) e Chorisia speciosa A.St.-Hil (Malvaceae) sob diferentes níveis de sombreamento

Pacheco, Fernanda Ventorim; Pereira, Carlos Rodrigues; Silva, Rogério Luiz da; Alvarenga, Ivan Caldeira Almeida

doi:10.1590/s0100-67622013000500017

Cited by 20 publications

(24 citation statements)

References 13 publications

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“…However, the increases in height and stem diameter were not proportional (Table 3), thus the acclimated seedlings of C. pachystachya had a lower H/D ratio, as also verified in C. speciosa in this study, and in other species by Gratzer et al (2004). A high H/D ratio resulting from the development of plants in shady spots can result in etiolated seedlings that are likely to have problems in sustaining their aerial part after planting at field (Pacheco et al 2013). Furthermore, the proportion of collenchyma in the stem decreased in shaded C. pachystachya seedlings (Table 2), which could reduce its resistance to factors that may cause deformation in this organ, such as the disturbance by winds (Niklas 1999).…”

Section: Discussionsupporting

confidence: 72%

Morphoanatomy and ecophysiology of tree seedlings in semideciduous forest during high-light acclimation in nursery

et al. 2015

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The recomposition of deforested environments demands the acclimation of seedlings in nurseries. This process induces changes in physiological, anatomical, and morphological traits of plants, favouring their establishment after transplantation to the field. The present study aimed to verify the influence of full sunlight acclimation on seedling hardiness. For the purpose, leaf gas-exchange, plant anatomical and morphological parameters of three tree species [Ceiba speciosa (A. St.-Hil.) Ravenna (Malvaceae), Croton floribundus Spreng. (Euphorbiaceae), and Cecropia pachystachya Trecul (Urticaceae)], which are used for reforestation in the Brazilian Atlantic Biome, were evaluated. Seedlings were grown under 40% of total PPFD (shaded control) and under full sun (acclimated) for 168 days. The acclimation process induced a higher leaf production rate in C. speciosa and C. floribundus, whereas C. pachystachya seedlings replaced their leaves quickly, irrespective of the light conditions. The newly developed leaves of all three species presented a lower area and thicker palisade parenchyma, resulting in a reduced specific leaf area. The seedlings of C. speciosa and C. pachystachya showed increases in light-saturated net photosynthesis and transpiration rates, whereas water-use efficiency generally remained unchanged in all three species. The full sun acclimated seedlings of C. pachystachya showed a reduced relative growth rate, lower height/stem diameter (H/D) and shoot to root dry mass ratios, characteristics that may result in greater physical resistance and ability for water and nutrient uptake to support the higher transpiratory demand under full sun. The reduction of H/D ratio also occurred in the acclimated seedlings of C. speciosa. The seedlings of C. floribundus showed few changes during acclimation, but they did not seem to be affected by excessive light. In spite of the observed differences among the three species, all of them developed hardiness characteristics, mainly related to leaf anatomy, which should favour their establishment after transplantation to the field.Additional key words: ecological anatomy, environmental restoration, mesophyll, plant ecophysiology.

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Section: Discussionsupporting

confidence: 72%

Morphoanatomy and ecophysiology of tree seedlings in semideciduous forest during high-light acclimation in nursery

et al. 2015

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“…As a result, initiatives for the execution of preservation projects and sustainable use and recovery of degraded pastures are growing, especially those involving the use of native species (Pacheco et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity among Hymenaea courbaril L. genotypes naturally occurring in the north of Mato Grosso State, Brazil

Rocha¹,

Tiago²,

Tiago³

et al. 2017

Genet. Mol. Res.

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ABSTRACT. Hymenaea courbaril L. is a tropical tree species with economic and medicinal potential largely used in programs for the recovery of degraded areas. The use of molecular markers in genetic studies can 2 V.D. Rocha et al. Genetics and Molecular Research 16 (3): gmr16039706 help in the definition of forest restoration strategies. This study was conducted to analyze the genetic diversity among H. courbaril ('jatobá') genotypes naturally occurring in the north of Mato Grosso State, Brazil, using ISSR markers, aiming to contribute to the development of seed collection and seedling production strategies. Twenty-four H. courbaril individuals were sampled by collecting leaves for DNA extraction by the CTAB method. The individuals were genotyped using 14 ISSR primers, resulting in the amplification of 87 bands in total, 65 of which were polymorphic. The ISSR markers presented average polymorphism information content of 0.44. Dissimilarity values based on the Jaccard coefficient ranged from 0.12 to 0.52. The most divergent individuals were 3 and 22, whereas 14 and 19 were the most genetically similar. The UPGMA and Tocher clustering methods indicated the formation of four distinct groups, revealing genetic variability among the 24 H. courbaril genotypes. Therefore, all the evaluated genotypes can be used for seed collection and seedling production, but the most divergent individuals should be prioritized.

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“…Ainda segundo esses autores, é grande a diversidade de respostas das plantas à luminosidade, principalmente no que se refere ao crescimento e desenvolvimento vegetativo da parte aérea. Diante da importância desse fator ambiental, vários autores estudaram a influência do sombreamento na produção de mudas de diversas espécies florestais (Câmara & Endres, 2008;Aguiar et al, 2011;Lenhard et al, 2013;Lopes et al, 2013;Pacheco et al, 2013;César et al, 2014;Santos et al, 2014). Para o nim indiano, porém, até o presente não existe informação disponível na literatura, o que torna esse tipo de estudo de grande relevância para o aprimoramento das técnicas empregadas na produção de mudas dessa espécie.…”

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Desenvolvimento de Mudas de Nim Indiano sob Diferentes Níveis de Sombreamento

et al. 2015

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RESUMOEste estudo teve como objetivo avaliar o efeito de níveis de sombreamento na produção de mudas de nim indiano (Azadirachta indica), visando a obtenção de mudas com maior padrão de qualidade. Foram adotados quatro tratamentos (pleno sol, 30%, 50% e 70% de sombreamento), dispostos em delineamento inteiramente casualizado, com seis repetições. Os parâmetros avaliados, aos 100 dias, foram: altura da parte aérea, diâmetro do coleto, relação altura/diâmetro, massa fresca e seca da parte aérea, raízes e total, número de folhas e índice de qualidade de Dickson. Os dados foram submetidos à análise de variância, sendo as médias comparadas pelo teste de Duncan a 5% de significância. Mudas produzidas a pleno sol apresentaram maior padrão de qualidade, sendo observados valores mais adequados para os parâmetros diâmetro do coleto, relação altura/diâmetro, massa fresca e seca das raízes, número de folhas e índice de qualidade de Dickson.Palavras-chave: viveiros florestais, luminosidade, parâmetros morfológicos, Azadirachta indica. Development of Indian Neem Seedlings under Different Levels of Shading ABSTRACTThe purpose of this study was to evaluate the effect of levels of shading on the seedling production of Indian neem (Azadirachta indica), aiming to obtain seedlings with higher quality standard. Four treatments were adopted (full sun; 30%, 50% and 70% of shading), arranged in a completely randomized design, with six replications. The following parameters were evaluated after 100 days: height of the aerial part; root-collar diameter; height/diameter ratio; fresh and dry mass of shoots, roots and total; number of leaves; and Dickson quality index. The data were subjected to analysis of variance and the averages were compared by the Duncan test at 5% significance level. Seedlings produced under full sun showed higher standard of quality, with more suitable values observed for the following parameters: root-collar diameter, height/diameter ratio, fresh and dry mass of roots, number of leaves, and Dickson quality index.

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Crescimento inicial de Dalbergia nigra (Vell.) Allemão ex. Benth. (Fabaceae) e Chorisia speciosa A.St.-Hil (Malvaceae) sob diferentes níveis de sombreamento

Cited by 20 publications

References 13 publications

Morphoanatomy and ecophysiology of tree seedlings in semideciduous forest during high-light acclimation in nursery

Morphoanatomy and ecophysiology of tree seedlings in semideciduous forest during high-light acclimation in nursery

Genetic diversity among Hymenaea courbaril L. genotypes naturally occurring in the north of Mato Grosso State, Brazil

Desenvolvimento de Mudas de Nim Indiano sob Diferentes Níveis de Sombreamento

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