On the evidence of subunifacial and unifacial leaves: developmental studies in leaf-succulent Senecio L. species (Asteraceae)

Ozerova, L.V.; Timonin, A.C.

Авторы: Ozerova L.V., Timonin A.C.
Журнал: Wulfenia
Том: 16
Год издания: 2009
Издательство: Botanischer Garten des Landes Karnten
Местоположение издательства: Austria
Первая страница: 61
Последняя страница: 77
Аннотация: The studied leaves initiate as completely bifacial primordia which differentiate into Unterblatt and Oberblatt. The Unterblatt remains bifacial throughout, highly inhibited, and develops to a very short leaf ground. The Oberblatt mostly changes into subunifacial structure due to a prominent thickening towards the apical dome. This thickening concurs with conspicuous widening of Oberblatt's abaxial side whereas its adaxial side nearly retains its original width. Oberblatt's tip becomes really unifacial. It has only an abaxial side and therefore differs from the rest of the Oberblatt. Leaf unifacial structure is thus not a misinterpretation of subunifacial structure sensu Hagemann, but a real phenomenon. The subunifacial basal Oberblatt develops into a terete, long cylindrical, spindle-shaped, or sub-ensiform leaf blade or into a petiole and globular leaf blade. All these leaves are called subunifacial because the subunifacial blade (and the petiole if present) highly exceeds both, the very short bifacial leaf ground and very short unifacial tip. The leaves that consist of a bifacial to subunifacial leaf ground and a highly prevailing unifacial rest of the leaf are suggested to be conventionally called unifacial. We conclude that the term 'subunifacial leaf' is neither a synonym nor a substitute of the term 'unifacial leaf'. Keywords: leaf development, unifacial leaf, subunifacial leaf, terete leaf, ensiform leaf, sub-ensiform leaf, spindle-shaped leaf, globular leaf, Unterblatt, Oberblatt, Senecio
Добавил в систему: Тимонин Александр Константинович

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On the evidence of subunifacial and unifacial leaves: developmental studies in leaf-succulent Senecio L. species (Asteraceae)статья