Developmental and Structural Section
Angyalossy, Veronica , Botânico, Marli , Tavares, Maíra .
Revisiting the secondary growth in palms.
There have been many works on palm stem anatomy from Europe during the period from the middle of the XIX to the beginning of the XX century. Since they are old and non translated into English, they are of difficult access. Therefore, they had been neglected for many years. According with the current literature, palm radial growth occurs by diffuse cell divisions at the older regions of the stem (diffuse secondary growth). Our studies on palm stem anatomy of Butia paraguayensis, Attalea geraensis (short stem) and Syagrus petraea (subterranean stem) show the presence of a meristematic band in the border region of the cortex and central cylinder that was originated from the pericycle. This meristematic band, here considered as secondary thickening meristem (STM), resembles the Cordyline model. This meristem is composed by several layers of cells that produce, inwards, new vascular bundles of metaphloem and metaxylem, parenchymatic cells that are added to the central cylinder and to the cortex, and, finally, new fiber bundles which are incorporated to the cortex. This secondary thickening meristem also forms adventitious roots. By reviewing the old literature, the presence of a meristematic band in palms was cited by an Italian researcher in 1904, and mentioned later by German researchers in 1906. These works were completely ignored later. A thorough review of the old literature in other languages beside English is necessary in order to recover the knowledge which is already available.
Log in to add this item to your schedule
1 - Universidade de São Paulo, Botany, Rua do Matão, 277. Cidade Universitária. Caixa-Postal: 11461., São Paulo, São Paulo, 05422-970, Brazil
2 - Rua Augusto de Miranda 1092, apto 132, São Paulo, São Paulo, 05026-001, Brazil
3 - Rua Inácio Manuel Alvares 600, apto 92, São Paulo, São Paulo, 05372-110, Brazil
short and subterranean stems
secondary thickening meristem
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 5:00 PM