| Full text | |
| Author(s): |
Vilhalva, Divina A. A.
[1]
;
Appezzato-da-Glória, Beatriz
Total Authors: 2
|
| Affiliation: | [1] Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia - Brasil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | BRAZILIAN JOURNAL OF BOTANY; v. 29, n. 1, p. 39-47, jan.-mar. 2006. |
| Field of knowledge: | Biological Sciences - Botany |
| Abstract | |
Several herbaceous species from cerrado (savana like vegetation) have thickened subterranean systems, which may be of root and/or stem nature. These systems have bud shoot-forming potential, providing the sprout of new shoots after an adverse period, like a severe drought or a burning. The verification of the subterranean systems nature is extremely important to the correct terminology usage. This work aimed to present information about subterranean systems morphology and anatomy of Calea verticillata and Isostigma megapotamicum, placing emphasis on the shoot-buds development. The subterranean systems were collected from cerrado areas of São Paulo State. The anatomical structure in C. verticillata is of both stem and root nature, with self-grafting of both shoots and roots, whereas in I. megapotamicum, the anatomical structure is caulinar, with self-grafting of shoots. Both species are composed of xylopodium with a high bud shoot-forming potential, whose buds are exclusively formed in the cambium. Secretory ducts occur in these species. The microchemical test, accomplished with Sudan black B, stained the oily nature of the secretion. Crystals of inulin were visualized by polarized light in I. megapotamicum. The high bud shoot-forming potential, present in the subterranean systems of both species here analyzed, improves their survival perspectives when they are submitted to the cerrado adverse conditions, by providing the sprouting of new shoots in favourable periods. (AU) | |
| FAPESP's process: | 00/12469-3 - Morphological, anatomical, histochemical, and ultrastructural studies of cerrado plants (sensu lato) of São Paulo State |
| Grantee: | Silvia Rodrigues Machado |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |