Showing papers on "Michelia published in 2006"

Comparative floral anatomy and ontogeny in Magnoliaceae

Abstract: Floral anatomy and ontogeny are described in six species of Magnoliaceae, representing the two subfamilies Liriodendroideae (Liriodendron chinese and L. tulipifera) and Magnolioideae, including species with terminal flowers (Magnolia championi, M. delavayi, M. grandiflora, M. paenetalauma) and axillary flowers (Michelia crassipes). The sequence of initiation of floral organs is from proximal to distal. The three distinct outermost organs are initiated in sequence, but ultimately form a single whorl; thus their ontogeny is consistent with a tepal interpretation. Tepals are initiated in whorls, and the stamens and carpels are spirally arranged, though the androecium shows some intermediacy between a spiral and whorled arrangement. Carpels are entirely free from each other both at primordial stages and maturity. Ventral closure of the style ranges from open in Magnolia species examined to partially closed in Michelia crassipes and completely closed in Liriodendron, resulting in a reduced stigma surface. Thick-walled cells and tannins are present in all species except Michelia crassipes. Oil cells are normally present. Floral structure is relatively homogeneous in this family, although Liriodendron differs from other Magnoliaceae in that the carpels are entirely closed at maturity, resulting in a relatively small stigma, in contrast to the elongate stigma of most species of Magnolia. The flower of Magnolia does not terminate in an organ or organ whorl but achieves determinacy by gradual diminution.

Advanced Research on Terpenoids in Michelia and Their Biological Activity

Abstract: The article has summarized the distribution, terpenoids and biological activity of Michelia;And has classified putting in order according to its affiliated basic skeleton on the structure of the terpenoids composition.It provided valuable chemistrical information for Michelia and offered reference for estimating medical effection of the genus in an all-round way.

Karyotypical Studies on an Endangered Species Alcimandra cathcartii (Magnoliaceae)

Abstract: The karyotype of Alcimandra cathcartii Dandy is reported for the first time.Its karyotype can be formulated as 2n=2x=38=22m+15sm (3sat)+1st,belonging to Stebbins's 2A type.Only the eighteenth chromosome is st chromosome,and one satellite has been found on the fifth,sixth,and seventh chromosomes respectively.The interphase nucleus is characteristic of simple chromocenter type,and during mitotic prophase,the condensation behavior of chromosomes conforms to the interstitial type.Comparing with previous karyotype research results of Magnolia and Michelia,Alcimandra cathcartii is phylogenetically closed to Michelia but far from Magnolia.

Tissue culture propagation process of late spring michelia

Abstract: The present invention is fast propagation tissue culture method of interspecific crossed F1 late spring michelia with M sphaerantha as female parent and M yunnanensis as male parent The method includes taking the stem section of annual or biannual young late spring michelia tree as explant to establish sterile line with high growth coefficient, and two-step process for rooting to obtain high rooting effect and high transplanting survival rate The late spring michelia is one ideal garden ornamenting tree

A karyomorphological study of 40 species in 11 genera of the Magnoliaceae from China

Abstract: In this paper, 40 species in 11 genera of the Magnoliaceae from China were karyomorphologically investigated for a better understanding of the intergeneric relationships in the family and the systematic positions of some species, particularly those in the genus Manglietia. The 20 Manglietia species studied are all diploid with 2n=38, indicating that in this genus the speciation may have taken place predominantly at the diploid level and that minor structural changes of chromosomes may have resulted in distinct morphological divergence. In the genus Magnolia, cytotypes with various ploidy levels from 2x to 6x have been found, which may be, at least to some degree, associated with the wide distributional range and complex gross-morphological variation of the genus. Our results indicate that Manglietia should be an independent genus from Magnolia and do not support the treatment of merging them as a genus. All the Michelia species already with chromosome numbers are diploid with 2n=38, while most of the species in Magnolia subgen. Yulania are polyploid, suggesting that Michelia is not closely allied with Yulania and that the two groups should not be merged as a genus. All Parakmeria members are polyploid. It is noteworthy that cytological evidence is generally less informative in clarifying the intergeneric relationships of the Magnoliaceae than the interspecific relationships within a given genus of the family because reticulate evolution may have extensively occurred in this family. Systematic positions of some species in Manglietia are discussed based on evidence from cytology, morphology and geographical distribution.

In vitro Culture of Hybrid F1 of Michelia crassipes Law(♀)×Michelia calcicola C. Y. Wu ex Law et Y. F. Wu(♂)

Abstract: The top buds and axillary buds of the hybrid F1 saplings of Michelia crassipes Law (♀) ×Michelia calcicola C. Y. Wu ex Law et Y. F. Wu (♂) were collected from August to next March and cultured on the medium H+0.25 mg·L-1 6-BA+0.125 mg·L-1 NAA+0.10 mg·L-1 KT+0.05 mg·L-1 IAA,and the rate of adventi-tious buds reached about 115%. The adventitious buds were cultured on the medium H+0.3 mg·L-1 6-BA+0.3 mg·L-1 KT,the proliferation and growth were better. When the shoots were cultured on medium H+2.8 mg·L-1 NAA,the rooting percentage was 100%. Phloroglucinol could greatly promote the shoot rooting,but it might restrain the root elongation. The well-rooted shoots were transplanted into composts (red soil,humus and perlite mixed with same volume) and the survival rate reached 90% after 60 days.

Analysis on chemical constituents of Michelia figo Spreng

Abstract: OBJECTIVE To analyze constituents of volatile oil from Michelia figo SprengMETHODS The volatile oil from flower,leaf,rootstock of Michelia figo Spreng was prepared by steam distillationThe constituents were analyzed and identified by GC-MSRESULTS 34,37,37 compounds were separated and identified respectivelyThe relative content of each component was determined by area normalizationCONCLUSION The main constituents of volatile oil from Michelia figo Spreng are β-elemene,methyl_2[3-cyclopropyl-7-norcaranyl]acetate,γ-elemene,betulene etc

An Experimental Study on Germination Rate and Seedling-forming Rate of Eight Species of Magnoliaceae

Abstract: The germination and seedling raising experiments of eight species of Magnoliaceae were carried out.A series of results were gotten as follows: the germination rate of Kmeria septentrionalis was 2.5 %,which was the lowest among all the tested species.The germination time of Michelia lanuginose and Michelia yunnanensis were the earliest.Michelia fovolata had the shortest duration in seed germination and emergence,the even degree of seed germination of Michelia yunnanensis was the best.The germination duration increased in the order of Michelia,Manglietia and Magonlia,the reason was the seed coat of Michelia was the thinnest,next come Manglietia,that of Magonlia was the thickest among the three species.