| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 650.41 KB | Adobe PDF |
Advisor(s)
Abstract(s)
A espécie aromática e medicinal Aloysia citrodora Palau, Verbenaceae, conhecida como limonete, erva -luísa ou lúcia-
-lima, é uma das mais cultivadas e comercializadas em Portugal. A instalação e manutenção dos campos de cultivo
exigem material de propagação em quantidade e com a qualidade e uniformidade que assegurem a comercialização
da biomassa, de acordo com os padrões dos compradores. A possibilidade dos produtores obterem as próprias plantas
depende da disponibilidade de material vegetativo ao longo de todo o ano e dos processos de rizogénese que nem
sempre são fáceis de induzir.
Realizaram -se ensaios de enraizamento de estacas caulinares lenhosas e semilenhosas, preparadas a partir de plantas-
-mãe cultivadas em campo comercial ao ar livre. O delineamento experimental incluiu estacas caulinares de diferente
espessura, diferentes substratos (perlite e composto orgânico comercial), hormona de enraizamento (com e sem auxina),
condições de humidade (com e sem nebulização) e temperatura (em bancada aquecida e sem aquecimento). Numa
segunda experiência avaliou -se a capacidade de enraizamento de material vegetal colhido ao longo de todos os meses
do ano a partir de plantas cultivadas em estufa.
As estacas colocadas em perlite originaram percentagens de enraizamento mais elevadas do que as estacas em substrato
orgânico, embora os valores tenham sido sempre inferiores a 20%. O substrato orgânico deu melhores resultados, conjugando
estacas grossas e ausência de nebulização, por oposição a estacas mais finas com nebulização. Ao longo do ano,
as percentagens de enraizamento foram máximas em maio, com valores superiores a 70%. As estacas semilenhosas do
período estival originaram percentagens de enraizamento particularmente baixas.
Aloysia citriodora Palau, Verbenaceae, known as lemon verbena, is one of the most cultivated and marketed medicinal and aromatic plants in Portugal. Biomass quality and uniformity of the plant material according to stakeholders’ standards are market criteria requiring important amounts of biomass supplied by producers’ organic fields. However, in order to satisfy such biomass needs, horticulturists should provide vegetative propagated plant material to install new fields or to regenerate the existing ones. Producing cuttings depends on the availability of plant material throughout the year and on rooting processes which could not be easy to induce. Woody and softwood stem cuttings were prepared from plants grown in the field. Different substrates, thickness of propagated material and exogenous application of auxin were compared in their capability to induce root and shoot formation. In other experiment, the rhizogenic ability of plant material was monthly assessed for a year from plants grown in a greenhouse. Cuttings placed in perlite presented higher percentages of rooting than those in organic substrate, although in both cases values of root formation were always below 20%. Organic substrate combined with thick cuttings and absence of nebulization had a better performance than thin cuttings with nebulization. Throughout the year, the rooting percentages were highest in May, with values greater than 70%. The softwood cuttings from summer period originated particularly low rooting percentages
Aloysia citriodora Palau, Verbenaceae, known as lemon verbena, is one of the most cultivated and marketed medicinal and aromatic plants in Portugal. Biomass quality and uniformity of the plant material according to stakeholders’ standards are market criteria requiring important amounts of biomass supplied by producers’ organic fields. However, in order to satisfy such biomass needs, horticulturists should provide vegetative propagated plant material to install new fields or to regenerate the existing ones. Producing cuttings depends on the availability of plant material throughout the year and on rooting processes which could not be easy to induce. Woody and softwood stem cuttings were prepared from plants grown in the field. Different substrates, thickness of propagated material and exogenous application of auxin were compared in their capability to induce root and shoot formation. In other experiment, the rhizogenic ability of plant material was monthly assessed for a year from plants grown in a greenhouse. Cuttings placed in perlite presented higher percentages of rooting than those in organic substrate, although in both cases values of root formation were always below 20%. Organic substrate combined with thick cuttings and absence of nebulization had a better performance than thin cuttings with nebulization. Throughout the year, the rooting percentages were highest in May, with values greater than 70%. The softwood cuttings from summer period originated particularly low rooting percentages
Description
Keywords
Estacaria de Aloysia citrodora Limonete Lúcia-lima Propagação vegetativa Enraizamento Estacaria
Citation
Carvalho, Ana Maria; Rodrigues, M.A. (2017). Estacaria de Aloysia citrodora Palau: ensaios de enraizamento em estufa e sob diferentes condições. Revista de Ciências Agrárias. ISSN 0871-018X. 40 (nº esp.), p. 50-58