resposta germinativa de duas espécies de vellozia (velloziaceae) dos campos rupestres de minas gerais, brasil germination response of two species of vellozia (velloziaceae) from the "campos rupestres" of minas gerais, brazil

Clicks: 157
ID: 210470
2007
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Steady

Ranked #108 of 124 articles by views in monatshefte für chemie chemical monthly

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 124 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Foi avaliado o comportamento germinativo das sementes de Vellozia leptopetala Goeth. et Henr., uma espécie de porte arbustivo que cresce sobre afloramentos rochosos e de V. epidendroides Mart. ex Schult. & Schult., uma herbácea que cresce em campos, na Serra do Cipó. As sementes foram submetidas às temperaturas de 15 a 40 ºC, sob luz ou escuro contínuos, com quatro repetições de 25 sementes por tratamento. Ambas as espécies apresentam sementes pequenas, com 1,31 ± 0,06 mm e 1,15 ± 0,01 mm para V. leptopetala e V. epidendroides, respectivamente. As sementes de V. leptopetala sob luz apresentaram germinabilidade alta (95 a 100%) e semelhante na faixa de 20 a 35 ºC e percentuais inferiores a 15 e 40 ºC (34 e 29%, respectivamente). Na condição de escuro a germinação só ocorreu nas temperaturas mais altas, alcançando 68% a 30 ºC e 3% a 40 ºC. Na presença de luz as sementes de V. epidendroides apresentaram altos percentuais de germinação na faixa de 30 a 40 ºC (91 a 84%), com diminuição gradativa da germinabilidade nas temperaturas mais baixas e inibição do processo a 15 ºC. No escuro ocorreu germinação na faixa de 20 a 40 ºC (3 a 88%), sendo significativamente superior a 35 e 40 ºC. A produção de sementes capazes de germinar em diferentes condições de temperatura e luminosidade pode ser de grande valor para a espécie, por permitir a colonização de maior diversidade de hábitats, como fendas de rochas sem luz, situação comum para V. leptopetala, ou com densa cobertura por herbáceas, para V. epidendroides.
The germination behaviour of Vellozia leptopetala Goeth. et Henr., a shrubby species growing on rocky outcrops, and of V. epidendroides Mart. ex Schult. & Schult., an herb growing in grasslands of Serra do Cipó, was evaluated under controlled light and temperature conditions. Seeds were sown at temperatures ranging from 15 to 40 ºC in continuous light or darkness, in four treatments with 25 seeds each. Both species produce small seeds; 1.31 ± 0.06 mm and 1.15 ± 0.01 mm for V. leptopetala and V. epidendroides, respectively. V. leptopetala seeds grown in light had high germinability (95-100%) between 20 and 35 ºC, and lower percentages at 15 and 40 ºC (34 and 29%, respectively). When grown in total darkness, significant germination occurred only at the highest temperatures, reaching 68% at 30 ºC and 3% at 40 ºC. V. epidendroides seeds grown in light had high germinability (91-84%) between 30 and 40 ºC, which gradually decreased at lower temperatures to no germination at 15 ºC. In darkness germination was successful between 20 and 40 ºC (3 to 88%), and was significantly higher at 35 and 40 ºC. The production of seeds capable of germinating in different temperature and light conditions may be of great value to a species, because it allows colonization of a greater diversity of habitats, including dark rock crevices, a common situation for V. leptopetala, or thick grass cover, for V. epidendroides.
Reference Key
garcia2007actaresposta Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Queila de Souza Garcia, Claudia Maria Jacobi, Beatriz de Aquino Ribeiro
Are you one of these authors? Claim your profile
Journal monatshefte für chemie chemical monthly
Year 2007
DOI
10.1590/S0102-33062007000200018
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000200018
Keywords
temperature vellozia epidendroidesbotany

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.