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26 results on '"Li, Hongqi"'

14. Early Cretaceous Archaefructus eoflora sp. nov. with Bisexual Flowers from Beipiao, Western Liaoning, China

Author

L. Michelle Bowe, Liu Yusheng, Ji Qiang, LI Hongqi, and David Winship Taylor

Subjects
Plant evolution, Gynoecium, Archaefructus, biology, Inflorescence, Shoot, Botany, Stamen, Geology, biology.organism_classification, Yixian Formation, Ovule
Abstract

Recently, whether Archaefructus has bisexual multi-parted flowers or just inflorescences of unisexual flowers, and whether it is ancestral to all angiosperms or a derived eudicot have been debated. Here, from the same Yixian Formation, NE China, we report a new Archaefructus species, A. eoflora sp. nov., with the generic characteristics of dissected leaves and bisexual reproductive axes. It is entirely preserved with roots, rhizome, shoots and protogynous reproductive organs at different developmental stages. Its lateral and main fertile shoots form a pseudo-indeterminate pattern, while the reproductive branches on the main shoot form a cymose inflorescence. Subtended by 1-2 bract-like leaves, the section of stamen clusters changes into a much shorter section of carpels that have one row of orthotropous ovules. Significantly, one cluster bearing two carpels and one stamen between the two sections demonstrates a true bisexual flower, an important step of the origin of floral bisexuality, and the homology between the stamen and carpel. The complex reproductive axes represent a mix between flowers and inflorescences, and suggest that A. eoflora sp. nov. possesses the potential to evolve into a variety of diverse flower types as found in modern basal and early fossil angiosperms. A comparison with other two species also leads to a revision of the generic diagnosis.

Published
2010

21. Gene targeted ablation of high molecular weight fibroblast growth factor-2

Author

Azhar, Mohamad, primary, Yin, Moying, additional, Zhou, Ming, additional, Li, Hongqi, additional, Mustafa, Marwan, additional, Nusayr, Eyad, additional, Keenan, Jack B., additional, Chen, Hwudaurw, additional, Pawlosky, Sharon, additional, Gard, Connie, additional, Grisham, Christina, additional, Sanford, L. Philip, additional, and Doetschman, Tom, additional

Published
2008
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26. Gene targeted ablation of high molecular weight fibroblast growth factor-2.

Author

Azhar M, Yin M, Zhou M, Li H, Mustafa M, Nusayr E, Keenan JB, Chen H, Pawlosky S, Gard C, Grisham C, Sanford LP, and Doetschman T

Subjects
Animals, Capillaries physiology, Fibroblast Growth Factor 2 genetics, Mice, Mice, Knockout, Protein Isoforms genetics, Protein Isoforms physiology, Coronary Vessels metabolism, Fibroblast Growth Factor 2 physiology, Myocardium metabolism
Abstract

Fibroblast growth factor-2 (FGF2) is produced as high molecular weight isoforms (HMW) and a low molecular weight isoform (LMW) by means of alternative usage of translation start sites in a single Fgf2 mRNA. Although the physiological function of FGF2 and FGF2 LMW has been investigated in myocardial capillarogenesis during normal cardiac growth, the role of FGF2 HMW has not been determined. Here, we report the generation of FGF2 HMW-deficient mice in which FGF2 HMW isoforms are ablated by the Tag-and-Exchange gene targeting technique. These mice are normal and fertile with normal fecundity, and have a normal life span. Histological, immunohistochemical, and morphometric analyses indicate normal myocardial architecture, blood vessel, and cardiac capillary density in young adult FGF2 HMW-deficient mice. These mice along with the FGF2- and FGF2 LMW-deficient mice that we have generated previously will be very useful for elucidating the differential functions of FGF2 isoforms in pathophysiology of cardiovascular diseases.

Published
2009
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