RESGATE E PROPAGAÇÃO VEGETATIVA DE Sequoia sempervirens

Objetivou-se com o estudo verificar resgate vegetativo, enraizamento de estacas e adaptacao das mudas enraizadas em sistema de minijardim clonal de Sequoia sempervirens . Realizou-se a decepa de cinco individuos com 20 anos de idade e apos foi contabilizada a capacidade de emissao de brotacoes. Com as brotacoes, foram confeccionadas estacas, as quais foram submetidas a diferentes concentracoes de acido indolacetico (AIA) (0, 2000, 4000 e 6000 mg.L -1 ). Foram avaliadas a porcentagem de enraizamento e o numero e comprimento de raizes 160 dias apos o estaqueamento. O experimento foi instalado em DIC, com 5 repeticoes de 10 estacas. Apos a formacao das mudas com as estacas enraizadas, elas foram transplantadas para vasos, para a formacao do minijardim clonal. O resgate vegetativo atraves da decepa de arvores apresentou potencialidade para producao de estacas de sequoia e revigoramento do material. O uso entre 2000 e 4000 mg.L -1 de AIA aumentou a porcentagem de enraizamento e tambem o numero e comprimento de raizes formadas. O minijardim clonal de sequoia mostrou ser uma boa opcao para a multiplicacao clonal da especie. A clonagem da sequoia pode auxiliar tanto no melhoramento convencional como em plantios comerciais da especie, principalmente no Sul do Brasil, local onde encontra condicoes adequadas para seu crescimento. Palavras-chave : Silvicultura clonal; coniferas; rejuvenescimento; minijardim clonal. Abstract Rescue and vegetative propagation of Sequoia sempervirens . The objective of the study to verify the vegetative rescue, rooting cuttings and rooted plants adapt in mini-clonal hedge of Sequoia sempervirens system. Was held coppicing five individuals aged 20 years old and was recorded after the ability to shoot emission. Shoots with different concentrations of indole acetic acid were applied (IAA) (0, 2000, 4000 and 6000 mg.L -1 ) in cuttings made by evaluating the percentage of rooting, number and length of roots 160 days after striking. The experiment was a completely randomized with five replicates of 10 cuttings. After the formation of seedlings with rooted cuttings, these were transplanted to pots for the formation of mini-clonal hedge. The vegetative rescue through coppicing trees showed potential for the production of cuttings sequoia and reinvigoration of the material. The use from 2000 to 4000 mg.L -1 IAA increased rooting percentage and the number and length of roots formed. The mini-clonal hedge of sequoia proved to be a good option for clonal multiplication of the species. Cloning of sequoia can help both conventional breeding and for commercial plantations of the species, especially in southern Brazil, where finds suitable conditions for their growth. Keywords : Clonal forestry; conifers; rejuvenation; mini-clonal hedge.

[1]  C. Ruedell,et al.  When stress and development go hand in hand: main hormonal controls of adventitious rooting in cuttings , 2013, Front. Plant Sci..

[2]  P. Savill,et al.  Sequoia sempervirens (D. Don) Endl. - coast redwood. , 2013 .

[3]  Daniel Furtado Ferreira,et al.  Sisvar: a computer statistical analysis system , 2011 .

[4]  G. E. Brondani,et al.  Propagação assexuada de Cupressus lusitanica , 2010 .

[5]  G. E. Brondani,et al.  Miniestaquia de Eucalyptus benthamii × Eucalyptus dunnii : (II) sobrevivência e enraizamento de miniestacas em função das coletas e estações do ano , 2010 .

[6]  J. Nemhauser,et al.  Do trees grow on money? Auxin as the currency of the cellular economy. , 2010, Cold Spring Harbor perspectives in biology.

[7]  F. Stampar,et al.  Juvenile stockplant material enhances root development through higher endogenous auxin level , 2009, Acta Physiologiae Plantarum.

[8]  T. Luna.  Vegetative Propagation Of Coastal Redwood (Sequoia sempervirens (Lamb. ex D. Don) Endl.) , 2008 .

[9]  C. B. Reissmann,et al.  Poda e anelamento em erva-mate (Ilex paraguariensis) visando à indução de brotações basais , 2008 .

[10]  Alexandre Couto Rodrigues,et al.  Níveis de cálcio e boro de gemas florais de pereira (Pyrus sp.) no sul do Brasil , 2006 .

[11]  W. Yin,et al.  Shoot regeneration and somatic embryogenesis from needles of redwood (Sequoia sempervirens (D.Don.) Endl.) , 2006, Plant Cell Reports.

[12]  J. A. S. Filho,et al.  Enraizamento de estacas lenhosas e herbáceas de cultivares de caquizeiro com diferentes concentrações de ácido indolbutírico , 2005 .

[13]  J. A. D. Queiroz,et al.  PROPAGAÇÃO VEGETATIVA DE ESPIRRADEIRA PELA TÉCNICA DA ESTAQUIA , 2004 .

[14]  R. Mitchell,et al.  The effects of ontogenetic maturation in Pinus patula - Part 1: nursery performance , 2004 .

[15]  R. Cameron,et al.  Adventitious rooting: examining the role of auxin in an easy- and a difficult-to-root plant , 2002, Plant Growth Regulation.

[16]  M. Dibley,et al.  NURSERY SYSTEMS TO CONTROL MATURATION IN PINUS RADIATA CUTTINGS , COMPARING HEDGING AND SERIAL PROPAGATION , 2004 .

[17]  J. Schiefelbein,et al.  Molecular identification of proline-rich protein genes induced during root formation in grape ( Vitis vinifera L.) stem cuttings , 2003 .

[18]  Fernando Correa,et al.  Enraizamento de diferentes tipos de estacas de aceroleira utilizando ácido indolbutírico , 2003 .

[19]  A. N. Gonçalves,et al.  Propagação vegetativa de Eucalyptus: princípios básicos e a sua evolução no Brasil , 2000 .

[20]  P. D. Tredici,et al.  Redwood Burls: Immortality Underground , 1999 .

[21]  N. Borralho,et al.  Genetic control of propagation effects and the importance of stock plant age and source on early growth in cuttings of Pinus radiata , 1999 .

[22]  A. Hamann.  Adventitious root formation in cuttings of loblolly pine (Pinus taeda L .): developmental sequence and effects of maturation , 1998, Trees.

[23]  P. Aderkas,et al.  Rejuvenation of Tissues from Mature Conifers and its Implications for Propagation in Vitro , 1993 .

[24]  R. Dodd,et al.  Cyclophysis and topophysis in coast redwood stecklings. I: Rooting and nursery performance , 1988 .

[25]  T. Davis,et al.  Adventitious root formation in cuttings , 1988 .