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| Mantovani,André. |
| Leaf succulence has important physiological and ecological implications. Currently it is quantified by Delf's index (fresh weight/leaf area) and fresh weight/ dry weight ratio. Both indeces are reconsidered and a new index is proposed. Shade and sun leaves from terrestrial, hemiepiphytic and epiphytic aroids were studied. Delf's formula, which does not consider dry weight, overestimated leaf succulence. As fresh weight / dry weight ratio (fw / dw) does not consider leaf area, plants with the same fw / dw ratio were more than five times different in area. The last case was only possible with a decrease in surface / volume ratio and a increase of mesophyll thickness, components not measured by fw / dw ratio. The new index proposed here, which takes into... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf succulence; Water relations; Leaf anatomy; Araceae; Ecophysiology. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100002 |
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| Mantovani,André; Filartiga,Arinawa Liz del Prado; Coelho,Marcus Alberto Nadruz. |
| São apresentados dados relativos à anatomia da lâmina foliar e espata de nove espécies do gênero Anthurium (seções Urospadix e Leptanthurium). Os indivíduos foram coletados em diversas partes do Brasil e aclimatados no Instituto de Pesquisas Jardim Botânico do Rio de Janeiro. O objetivo deste estudo foi comparar as características anatômicas da lâmina foliar e da espata, detectando caracteres que sejam potenciais para subsidiar e contribuir aos estudos taxonômicos do gênero Anthurium. Observa-se nas folhas a presença tanto de cutícula lisa quanto estriada, células epidérmicas dispostas ao acaso, estômatos no mesmo nível das demais células da epiderme ou elevados, glândulas epidérmicas e divisões periclinais em células epidérmicas, além de ráfides, drusas,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptanthurium; Taxonomia; Urospadix. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000100016 |
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| Mantovani,André; Gomes,Mario; Gomes,Doria Maria Saiter; Vieira,Ricardo Cardoso. |
| São apresentados dados sobre a anatomia das folhas de Rudgea decipiens e R. macrophylla (Rubiaceae). Ambas ocorrem na Floresta de Tijuca (Mata Atlântica), Rio de Janeiro. As folhas são hipostomáticas, com estômatos do tipo paralelocítico, dotadas de mesofilo dorsiventral, feixes vasculares do tipo colateral, papilas na epiderme abaxial e cutícula estriada. Em R. macrophylla, destaca-se a ocorrência de estômatos peculiares. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomia foliar; Rudgea; Rubiaceae. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061995000200005 |
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| Mantovani,André; Iglesias,Ricardo R.. |
| Bromeliad seedlings are rarely found on sandy coastal plains (restinga), limited, probably, by stressful conditions and/or specific abiotic requirements for germination. The effect of water stress on rate, time, synchronicity and spreading of germination was evaluated here for three terrestrial bromeliads from the restinga of Maricá using osmotic solutions of polyethyleneglicol 6000 (PEG 6000), from 0.0 to -0.26 MPa for 30 days. Water stress induced by PEG lowered rate and increased time and synchronicity values, besides the number of daily events of bromeliad seed germination, under water potentials between 0.00 to -0.14 MPa. No seeds germinated under water potentials lower than -0.14 MPa. These results reinforce a constant and/or high moisture... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bromeliaceae; PEG; Sandy plains; Seed. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000100017 |
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