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Heteroblastic leaf development on the generative shoots of some dicotyledonsстатья
Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
- Авторы: Barykina Rimma P., Churikova Olga A.
- Журнал: Wulfenia
- Том: 21
- Год издания: 2014
- Издательство: Botanischer Garten des Landes Karnten
- Местоположение издательства: Austria
- Первая страница: 33
- Последняя страница: 48
- Аннотация: The results of developmental and structural studies on three leaf formations of generative shoots of Nandina, Mahonia and Helleborus species of different eco-geographical origin from native area and introduced ones are outlined here. The development of three leaf formations (cataphylls, assimilative leaves, bracts) from different parts of leaf primordia, in our view, is the base of leaf heterogeneity. The results of comparative studies of developmental and anatomical structures show that homological formations (cataphylls and assimilative leaf bases) of shrubs and herbaceous forms are characterized by their considerable similarity. More vigorous development of leaf bases are due to their multifunctionality. Amphistomacy and the presence of homogenous mesophyll are distinctive features of cataphylls and bracts, unlike assimilative leaf laminas. Cataphylls of herbaceous forms lack many special defensive features which are characteristic of many woody ones. The defensive function of cataphylls is supplied by anatomical features of the epidermal complex and by the presence of anthocyans and tannin substances as well. Great anatomical similarity of bracts and sepals are revealed. It confirms the possibility of bracteous origin of the calyx in Berberidaceae and Ranunculaceae.
- Добавил в систему: Чурикова Ольга Альбертовна