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|Type:||Artigo de periódico|
|Title:||Gynostegium morphology of Mesechiteae miers (Apocynaceae, Apocynoideae) as it pertains to the classification of the tribe|
do Rio, MCS
|Abstract:||In order to investigate morphological patterns in Mesechiteae and test the new circumscription of the tribe, the gynostegium structure of nine species belonging to Forsteronia, Mandevilla, and Mesechites, with two species from Secondatia as outgroup, were comparatively studied. Our results support the most recent circumscription of Mesechiteae, including Forsteronia, Mandevilla, and Mesechites and excluding Secondatia. The gynostegia of Forsteronia, Mandevilla, and Mesechites have the same basic organization: a proliferation of parenchyma cells in the style head forms five projecting ribs that are adnate to an expanded portion of the connective below the thecae, here named the 'staminal retinacle'. This adnation is very tenuous in Forsteronia ( few cells of the staminal retinacle are effectively connected to the style head) but much stronger in Mandevilla and Mesechites (several cells of the staminal retinacle are connected to the style head). The observed differences in the size of the style head ribs and the degree of adnation to the stamens also support the three major clades recognized within the tribe. The gynostegium of Secondatia has a different organization, of the type reported for representatives of the tribe Apocyneae: the style head has no projecting ribs, and its epidermal cells are interdigitated with, but not adnate to, unicellular trichomes of the staminal retinacle.|
|Editor:||Univ Chicago Press|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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