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Meristem fate and bulbil formation in Titanotrichum (Gesneriaceae).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wang, Chun-Neng Cronk, Quentin C. B.
Description	Country affiliation: United kingdom Author Affiliation: Wang CN ( Royal Botanic Garden, 20A Inverleith Row, Edinburgh EH3 5LR, Scotland, UK)
Abstract	Titanotrichum oldhamii (a monotypic genus from Taiwan, Okinawa, and adjacent regions of China) has inflorescences bearing either showy yellow flowers or asexual bulbils. Asexual reproduction by bulbils is important in natural populations, and bulbil production increases in August and September at the end of the flowering season (which runs from June to the end of September). The bulbils are small (â¼1-2.5 mm long) and numerous. They consist of a small portion of stem (bract-stem) topped by opposite storage bracts that enclose a minute apical meristem. A secondary root develops from the side of the bract-stem. The floral meristem of T. oldhamii has three possible fates: (1) bulbil formation, (2) flower formation, or (3) bracteose proliferation. Bracteose proliferation rarely occurs and appears to be a developmental transition between the bulbiliferous and racemose inflorescence forms. It is strongly reminiscent of the floricaula and squamosa mutants of Antirrhinum. In the bulbiliferous form a single floral primordium, which would normally produce one flower, gives rise to â¼50-70 bulbils by repeated subdivision of the meristem. This form of bulbil production appears to be unique to Titanotrichum. Occasionally a floral meristem divides, but the subdivision forms multiflowered units of up to four flowers rather than bulbils, suggesting that meristem fate is reversible up to the first or second meristem subdivision. In Titanotrichum, therefore, primordium fate is apparently not determined at inception but becomes irreversibly determined shortly after the appearance of developmental characteristics of the floral or bulbil pathway.
File Format	HTM / HTML
ISSN	00029122
e-ISSN	15372197
Journal	American Journal of Botany
Issue Number	12
Volume Number	90
Language	English
Publisher	Botanical Society of America
Publisher Date	2003-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Plant Science Agriculture Science Botany
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Ecology, Evolution, Behavior and Systematics

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