Строение, происхождение и эволюция вальковатых листьев в секции Rowleyani C. Jeffrey рода Senecio L. (Asteraceae)статья
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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.
Аннотация:STRUCTURE, ORIGIN AND EVOLUTION OF THE TERETE LEAVES IN ROWLEYANI C. JEFFREY SECTION OF SENECIO L. GENUS (ASTERACEAE)
5 types — the typical bifacial with the blade and petiole, the epiascidiate with bifacial blade and unifacial petiole, the bifacial terete and unifacial terete and secondary bifacial ones — were revealed as a result of investigation of leaf in 11 Senecio L. species of the Rowleyani section. Phylloid nature of both terete and secondary bifacial leaves was confirmed. The pathway of leaf evolution from the typical bifacial leaves with blade and petiole through ascidiate ones to the primitive terete leaves is traced in the section. High variability of mutual proportions of adaxial and abaxial sides of leaf is inherent in the primitive terete leaves. The latters gave rise to the strictly unifacial terete leaves as well as the strictly bifacial ones. Further both types evolved into leaves with the secondary «blade» and «petiole». Specific pathway of evolution of the primitive terete leaves resulted in appearing of the secondary bifacial leaves.