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Anatomy and ontogeny of unisexual flowers in dioecious Woonyoungia septentrionalis (Dandy) Law (Magnoliaceae) 被引量:3
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作者 Lin FU Qing-Wen ZENG +1 位作者 Jing-Ping LIAO feng-xia xu 《Journal of Systematics and Evolution》 SCIE CSCD 北大核心 2009年第4期263-272,共10页
Woonyoungia septentrionalis (Dandy) Law is aceae. The floral morphology and structure of the species a dioecious species with unisexual flowers in Magnoliare conspicuously different from other species and are import... Woonyoungia septentrionalis (Dandy) Law is aceae. The floral morphology and structure of the species a dioecious species with unisexual flowers in Magnoliare conspicuously different from other species and are important to the study of floral phylogeny in this family. The floral anatomy and ontogeny were investigated to evaluate the systematic position of W. septentrionalis, using scanning electron microscopy and light microscopy. All of the floral organs are initiated acropetally and spirally. The carpels are of conduplicated type without the differentiation of stigma and style. The degenerated stamens in the female flowers have the same structures as the normal stamens at the earlier developmental stages, but they do not undergo successive development and eventually degenerate. The male floral apex was observed to have the remnants of carpels in a few investigated samples. As the bisexual flower features could be traced both in the male and female flowers in W. septentrionalis, it suggests that the flower sex in Magnoliaceae tends toward unisexual. As well as the unisexual flowers, the reduced tepals and carpels and concrescence of carpels conform to the specialized tendency in Magnoliaceae, which confirms the derived position of W. septentrionalis in this family. As the initiation pattern of floral parts of W. septentrionalis is very similar to other species in this family, it needs further investigation and especially comparison with species in Kmeria to evaluate the separation of Woonyoungia. 展开更多
关键词 floral anatomy MAGNOLIACEAE ONTOGENY Woonyoungia septentrionalis (Dandy) Law.
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Floral Ontogeny of Two Species in Magnolia L. 被引量:2
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作者 feng-xia xu 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2006年第10期1197-1203,共7页
Floral ontogeny is described in two species of genus Magnolia (Magnollaceae), Magnolia alboserlcea Chun et C. Tsoong, and M. amoena Cheng, representing subgenus Magnolia and subgenus Yulani In Magnolia, by using sca... Floral ontogeny is described in two species of genus Magnolia (Magnollaceae), Magnolia alboserlcea Chun et C. Tsoong, and M. amoena Cheng, representing subgenus Magnolia and subgenus Yulani In Magnolia, by using scanning electron microscope (SEM). The sequence of Initiation of floral organs Is from proximal to distal. The three distinct outermost and middle organs are Initiated in sequence, but ultimately form a single whorl, thus their ontogeny Is consistent with a sepal Interpretation. The last three tepals (petals) alternate with the preceding tepal whorl. The members of androeclum and gynoeclum arise spirally, although the androecium shows some Intermedlacy between a spiral and whorled arrangement. The carpel prlmordia initiate in group of four to five. The order of stamen Initiation within each tier Is not determined. The floral ontogeny Is remarkably homogeneous between the subgenus Magnolia and subgenus Yulani that does not support the resuming of genus Yulani. 展开更多
关键词 floral ontogeny Magnolia albosericea Magnolia amoena subgenus Magnolia subgenus Yulania
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