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Androecium anatomy of Isertia laevis, a polysporangiate species of Rubiaceae
Ist Teil von
Protoplasma, 2021-05, Vol.258 (3), p.547-557
Ort / Verlag
Vienna: Springer Vienna
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this study, we performed an anatomical analysis of the polysporangiate anthers and the development of pollen in
Isertia laevis
(Rubiaceae) with the aim to elucidate the internal structure of these atypical anthers. For this purpose, flowers in successive stages of development were dissected and the anthers were processed for conventional anatomical analysis. The material was examined using light microscopy and scanning electron microscopy. The present study shows that the anthers of
Isertia laevis
have two thecae divided into multiple microsporangia. This division is due to the presence of transverse and longitudinal septa formed of parenchyma and idioblasts with crystals. The septa appear together with the microsporangia and remain in the mature anther, even developing fibrous thickening. As the anther matures, the idioblasts in the septa accumulate crystals until they break, facilitating the separation of the septa from the outer wall of the theca, and thus apparently assisting the process of dehiscence. The mature anther opens through the longitudinal dehiscence of each theca. In addition to the anatomy of the anther, the development and morphology of the pollen, and the presence of orbicules are described. The structure of the anthers of
I. laevis
is discussed with other polysporangiate species in the Rubiaceae and angiosperms.