Base de dados : LILACS
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Id: biblio-859948
Autor: Emer, Aquélis Armiliato; Oliveira, Marisa de Cacia; Althaus-Ottmann, Michelle Melissa.
Título: Biochemical composition and germination capacity of Ligustrum lucidum ait. seeds in the process of biological invasion / Composição bioquímica e capacidade de germinação de sementes de Ligustrum lucidum ait. no processo de invasão biológica
Fonte: Acta sci., Biol. sci;34(3):353-357, July-Sept. 2012. ilus.
Idioma: en.
Resumo: Ligustrum lucidum ait. is an exotic species and In the present study, contents of sugars, proteins, and germination were evaluated in seeds removed from not abscisic and abscisic fruits. The seeds were stored or not under shadow or sun. The higher contents of total and reducing sugars were observed in seeds removed from not abscisic fruit while the period of storage resulted in the loss of these compounds. The same result was observed in the content of total sugars of seeds from abscisic fruits. The content of reducing sugars in seeds from abscisic fruits and submitted to storage had its content increased. The contents of total proteins in seeds from abscisic and not abscisic submitted to shadow or sun were not significantly different, but the results suggested an increase in protein synthesis during the storage period, differently from those seeds that were not submitted to storage. When seeds from abscisic and not abscisic fruits were evaluated immediately after harvest, they presented greater percentages of germination, while after 28 days, seeds submitted to the storage treatments showed lower values. The invasive potential of L. lucidum seems to be more associated to the number of seeds produced, than to their germination potential.

Ligustrum lucidum ait. é uma espécie exótica e no presente trabalho foram avaliados os teores de açúcares totais, redutores, proteínas, e germinação de sementes retiradas de frutos coletados da planta-mãe (não abscisados) e dispersos (abscisados) mantidos ou não em condições de sombra ou sol. Os maiores teores de açúcares totais e redutores foram obtidos em sementes imaturas, enquanto o armazenamento levou à perda destes composto, o que foi observado também para açúcares totais, nas mesmas condições, para sementes maduras. Verificaram-se aumentos nos teores de açúcares redutores em sementes maduras armazenadas. Apesar de não serem estatisticamente significativos, estes resultados entre sementes maduras e imaturas submetidas ao mesmo tratamento, indicam possível aumento da síntese protéica durante o período de armazenamento, sugerido pelo acréscimo no teor de proteínas totais, com pequena perda e/ou inibição em sementes de frutos submetidos ao sol. Sementes maduras e imaturas, imediatamente testadas após a coleta, apresentaram os maiores valores de porcentagem de germinação. no final de 28 dias de avaliação, enquanto aquelas submetidas aos tratamentos de armazenamento ficaram muito abaixo destes valores. Pelo presente trabalho, o potencial invasor de L. lucidum parece estar relacionado mais ao número de sementes produzidas pela espécie que o seu potencial germinativo.
Descritores: Carboidratos
Ligustrum
Oleaceae
Proteínas
Responsável: BR513.2 - Editora da Universidade Estadual de Maringá


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Id: lil-365954
Autor: Aragón, Roxana; Groom, Martha.
Título: Invasion by Ligustrum lucidum (Oleaceae) in NW Argentina: early stage characteristics in different habitat types
Fonte: Rev. biol. trop;51(1):59-70, mar. 2003. tab, graf.
Idioma: en.
Resumo: Currently biological invasions are considered one of the world's most serious conservation problems. Ligustrum lucidum is the most abundant exotic tree in secondary forest patches of montane forests of NW Argentina. We studied the determinants of success of the early stages of its life cycle in distinct habitat types, with the hope of identifying vulnerabilities that could be exploited to control the invasion. Seed arrival, germination, seedling recruitment and survival, and sapling growth were studied in edges, gaps and forest interior. Seed arrival was also assessed under perches and in open fields. Germination was studied in forest and grassland patches. L. lucidum seedling survival and sapling growth were compared with the most abundant native species survival and growth. Seed arrival was strongly seasonal with a peak in mid-August. Seed rain did not differ significantly among habitat types, however there was a tendency for edges to receive more seeds when only dispersed seeds were considered. Perches strongly enhanced seed arrival; more than 40 times the number of seeds were dispersed beneath citrus plants (i.e. perches) than found in paired open areas. In the forest, seeds in gaps and edges had higher germination rates, but there was no difference in seedling survival. Fruits under closed canopy exhibited the lowest germination. Germination and survival were low in open areas. Neither seedling recruitment nor sapling growth differed between gaps and forest interior. L. lucidum saplings grew significantly more than saplings of the most common native species, and also showed higher seedling survival. L. lucidum is a prolific fruit producer, is capable of germinating and surviving in a broad range of forest environments, it is relatively shade tolerant and has higher survival and faster growth rate in comparison to the most common native species. All these characteristics highlight its potency as a successful invader, and point to few vulnerabilities that could be targets of control measures.
Descritores: Ligustrum
-Argentina
Germinação
Dinâmica Populacional
Estações do Ano
Sementes
Análise de Sobrevida
Responsável: BR1.1 - BIREME



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