Data/hora: 11/06/2024 15:47:23

Provedor de dados: | 61
País: | Brazil
Título: | Influence of shoot inclination on irradiance and morphophysiological leaf traits along shoots in cerrado trees with distinct leaf deciduousness
Autores: | Souza,João Paulo; Prado,Carlos Henrique B. A.; Damascos,Maria A.; Albino,Ana Lúcia S.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Leaf-life-span; Maximum net photosynthesis; Orthotropic; Self-shading; Plagiotropic.
Resumo: | This study investigated the relationship among shoot inclination, irradiance and morphophysiological traits of basal (BL) and distal (DL) leaves in six cerrado trees with distinct leaf deciduousness. Deciduous species showed plagiotropic shoots (44º) and larger leaf area than semideciduous and evergreen species, which showed orthotropic shoots (56º and 63º, respectively). Despite larger leaf area, irradiance at shoot base in deciduous was around 85% in relation to full irradiance, while in semideciduous and evergreen only 23% of irradiance reached on BL. Likewise, maximum net photosynthesis (Pnmax) was similar between BL and DL in deciduous. Contrastingly, semideciduous and evergreen showed significant decreasing of Pnmax in BL. Plagiotropic shoots of deciduous allow similar irradiance along shoots, resulting in similar Pnmax along shoot. On the other hand, orthotropic shoots of semideciduous and evergreen resulted in shading and decreasing of Pnmax on BL. However, considering BL and DL together, there was not significant difference of leaf-life-span or Pnmax among deciduous, semideciduous and evergreen. Therefore, shoot inclination and shading among leaves on same shoot should be significant influencing leaf morphophysiological traits along shoots in cerrado trees. On the other hand, similar leaf-life-span among phenological groups resulted in absence of Pnmax differences when BL and DL were considered together.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000400004
Editor: | Brazilian Journal of Plant Physiology
Relação: | 10.1590/S1677-04202009000400004
Formato: | text/html
Fonte: | Brazilian Journal of Plant Physiology  v.21 n.4 2009
Fonte: | info:eu-repo/semantics/openAccess