germinação de sementes de espécies medicinais do rio grande do sul: bromelia antiacantaha bert., cuphea carthagenensis (jacq.) macbride e talinum patens (jacq.) willdenow seed germination of medicinal plants of rio grande do sul state, brazil: bromelia antiacantha bert., cuphea carthagenensis (jacq.) macbride and talinum patens (jacq.) willdenow

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ID: 145245
1998
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Abstract
As espécies estudadas são ervas de expressiva dispersão no Estado do Rio Grande do Sul e com uso difundido na farmacopeia popular. Estudou-se a influência de diferentes temperaturas constantes (10, 15, 20, 25, 30 e 35ºC) sob condição de escuro ou de luz (fotoperíodo: luz/escuro 8h/16h) e as temperaturas alternadas (10-20, 15-25, 20-30 e 25-35ºC) sobre o comportamento germinativo das sementes. As sementes não germinadas foram submetidas ao teste de tetrazólio. Sementes de B. antiacantha germinaram acima de 80% nas temperaturas constantes de 25, 30 e 35ºC na luz e no escuro. Abaixo de 25ºC, as sementes apresentaram dormência relativa. No armazenamento por um ano sob condições ambientais (25 ºC) e sob refrigeração (5ºC), a viabilidade das sementes foi mantida em 90%. Sementes de C cartliagenensis germinaram acima de 80% nas temperaturas alternadas. Em temperaturas constantes, a germinação foi nula, mas as sementes estavam viáveis. Em T patens constatou-se acima de 50% se sementes deterioradas e a germinabilidade foi semelhante nas temperaturas constantes em relação às alternadas. As três espécies podem ser propagadas através de sementes, se as condições de temperatura apropriadas forem observadas.
These species of herbs are well distributed over all Rio Grande do Sul State, and are used to prepare medicine for the human population. The influence of constant temperatures (10ºC; 15ºC; 20ºC; 25ºC; 30ºC and 35ºC) on the germination of seeds during a photoperiod of 8 hours, was analyzed. Experiments were also performed in darkness, and at alternating temperatures (10-20ºC; 15-25ºC; 20-30ºC; 25-35ºC). Seeds that did not germinate were submitted to the tetrazolium test. Over 80% of the seeds of B. antiacantha germinated at constant temperatures of 25º, 30º or 35ºC, both in light and darkness. Below 25ºC, the seeds presented relative dormancy. Storage during one year under laboratory conditions (25ºC), or at a low temperature (5ºC) allowed for 90% of seed viability. Over 80% of the seeds of C. cartliagensis germinated at alternating temperatures, but no germination was observed at constant temperatures, although the seeds remained viable. T. patens presented over 50% of deteriorated seeds and final germination was similar at constant and alternating temperatures. The three species can be propagated through seeds, if the appropriate temperature requirements are observed for each of them.
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rosa1998actagerminao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shirley G. T. da Rosa, Alfredo Gui Ferreira
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Journal monatshefte für chemie chemical monthly
Year 1998
DOI
10.1590/S0102-33061998000400018
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061998000400018
Keywords
temperature light

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