Showing papers on "Michelia published in 2003"

Phylogenetic relationships in Magnoliaceae subfam. Magnolioideae: a morphological cladistic analysis

Abstract: Relationships within Magnolioideae have been the subject of persistent debate; the main point at issue mostly being the disposition of tribes, genera and sections. A morphological cladistic analysis of the subfamily using Liriodendron as the out-group showed that Magnolioideae consisted of a large basal polytomy, but with five resolved and variously supported clades. Manglietia constituted a clade with sect. Rytidospermum of Magnolia subg. Magnolia. Kmeria and Woonyoungia formed a pair. Pachylarnax, Parakmeria and Manglietiastrum were grouped together, and sect. Splendentes and Dugandiodendron also formed a pair. The largest and best supported clade consisted of Magnolia subg. Magnolia sects. Oyama and Maingola, Magnolia subg. Yulania, Michelia, Aromadendron, Alcimandra, Elmerrillia, Paramichelia and Tsoongiodendron, with sect. Oyama of Magnolia subg. Magnolia is sister to the remainder. Although Magnolia sect. Maingola, Aromadendron, Alcimandra and Elmerrillia constituted a poorly resolved subclade, Aromadendron formed a monophyletic clade with Alcimandra. Within the Michelia/Magnolia subgen. Yulania subclade, Paramichelia was sister to Tsoongiodendron. These results are supported by similar placement of taxa within various molecular analyses of the family, but the low level of resolution indicates that more morphological data are needed to improve phylogenetic signal. Our results support the molecular analyses in suggesting that Magnolia is best considered to be a large and diverse genus, but that the relationships between the taxa within it require more detailed clarification, with more extensive sampling and a combined molecular and morphological approach being needed.

The systematic relationship of the tribe M agnolieae and M ichelieae --based on matK sequence analysis

Abstract: In this paper, matK gene of the chloroplast DNA was sequenced in representatives of 7 species from the genus Magnolia and 4 species from the genus Michelia . The results indicated that the delimination of Magnolia and Michelia was not clear and the point that devided the Magnolieae and Michelieae with the character terminal flower and flower should not be supported.

Pollen morphology of 9 species from Magnoliaceae

Abstract: The pollenmorphology characteristics of 9 species of Magnoliaceae (Sinomanglietia glauca , Manlietia patungensis , Magnolia denudata , Magnolia biondii , Magnolia amoena , Michelia caloptila , Michelia chapensis , Michelia maudiae , Magnolia zenii )were observed by both optical microscope and scanning electron microscope (SEM), the result showed that the shape and germination aperture of 9 speices are similar , but their size and exine sculpture are different , and so are the different population of one species .Therefore , pollen morphology can be applied for taxonomy of Magnoliaceae to some extent , and it is important to adopt these evidence carefully combined with other evidence .[ Ch , 1 fig .1 tab .8 ref .]

The Crossing Result of Magnoliaceae

Abstract: Crossing experiments of 68 combinations within and between genera of Magnoliaceae were made in the Fairy Lake Botanical Garden based on the conventional methods of hybridization. Results revealed that the pollen vigor was various among different species. The low rate of pollen germination was not an important factor responsible for the low fruit set since owning a large number of pollens and having a high fruit set after manual crossing. The cross-compatibility commonly existed in the same genus of Magnoliaceae, except genus Magnolia (between subgenus Magnolia and Yulania). Furthermore, reproductive isolation between some species of Michelia was found. Subgenus Yulania and genus Michelia had a very close relationship, for their crossing being highly compatible and the hybrids being vigorous. Since it had reproductive isolation with Michelia, genus Tsoongiodendron should be accepted.