Author(s): Zhou QY, Bertin RI, Fu DZ
Source: INTERNATIONAL JOURNAL OF PLANT SCIENCES 167 (2): 201-212 MAR 2006
Document Type: Article
Language: English
Cited References: 46 Times Cited: 1
Abstract: We investigated the sexual system, floral biology, sporogenesis, and gametogenesis of Tetradium daniellii (Bennett) Hartley, which possessed distinct male and monoecious sexual phenotypes. Male individuals produced almost exclusively male flowers. In the years 2000 - 2002, the protandrous monoecious individuals had male and female flowering phases completely separated in time within and between the plants, while in 2003 and 2004, slight overlap of male and female functions occurred. During early floral development, all flowers were hermaphroditic. Dimorphic unisexual flowers resulted from later selective abortion of the gynoecium or androecium. Male flowers and their pollen in the two sexual morphs did not significantly differ in structure. Pollen grains from male flowers on both male and monoecious plants were fertile and could germinate on the stigmas of female flowers on monoecious plants. Maturation of female gametophytes in monoecious plants coincided with the release of the three-celled pollen in the male plant. We propose that the sexual system of T. daniellii has arisen from hermaphroditism and is likely to lead to dioecism.
Author Keywords: sexual system; floral biology; gametogenesis; evolution; Tetradium daniellii; monoecy
KeyWords Plus: THYMELAEA-HIRSUTA THYMELAEACEAE; FLOWERING PLANTS; DIOECIOUS PLANTS; MALE-STERILITY; ANGIOSPERMS; DICHOGAMY; INTERFERENCE; MONOECY; HETERODICHOGAMY; CUCURBITACEAE
Addresses: Zhou QY (reprint author), Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
Coll Holy Cross, Dept Biol, Worcester, MA 01610 USA

E-mail Addresses: qyzhou@ibcas.ac.cn, rbertin@holycross.edu
Publisher: UNIV CHICAGO PRESS, 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA
Subject Category: Plant Sciences
IDS Number: 021SW

ISSN: 1058-5893