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Brazilian Journal of Botany
On-line version ISSN 1806-9959
MAYER, Juliana Lischka Sampaio; ALVES, Ana Cristina Atala; SOUZA, Luiz Antonio de and BONA, Cleusa. Rollinia sylvatica (A. St.-Hil.) Mart. (Annonaceae) seedling and tirodendro morphology and anatomy. Rev. bras. Bot. [online]. 2008, vol.31, n.4, pp. 689-700. ISSN 1806-9959. http://dx.doi.org/10.1590/S0100-84042008000400014.
Morphology and anatomy studies about seedling are important to identify species and to comprehend Angiosperm life cycle. However, there are few researches about it. The aim of this study is to analyze the morphological and anatomical aspects of the structure of Rollinia sylvatica (A. St.-Hil.) Mart seedlings, which is a native species from South of Brazil.The seedlings were obtained from seeds collected in Antonina, state of Paraná. The germination was carried out in a green house condition. Seedlings and tirodendros were collected 2, 4, 8, 18, 40 e 55 days after germination and were fixed in FPA 50. These plants are phanerocotylars and epigeous with tap and diarch root. The hypocotyl has transition structure between root and stem, being separated and spreading cells from primary xylem, arranged around of parenchyma pith. Phloem keeps undivided. At the beginning of epicotyls two vascular bundles are formed. The 55 day old seedlings secondary growth is notorious in the root basal region, hypocotyl and epicotyl. Cotyledons, eophylls and metaphylls present uniseriate epidermis on both faces. Cotyledons are amphihypostomatic and eophylls and metaphylls are hypostomatic, all of them have dorsiventral mesophyll. The cotyledon midrib is not prominent with a bundle. The midrib is prominent and it has five collaterals bundle in the eophyll and seven in the metaphyll. The three leaves have different petiole formats, subepidermic collenchyma, two collateral vascular bundles ones in the cotyledon and ten in the eophyll and metaphyll.
Keywords : anatomy; araticum; morphology; seedling.