TY  - JOUR
A1  - Feng, Xiao-Li
A1  - Ni, Wei-Min
A1  - Elge, Stephan
A1  - Müller-Röber, Bernd
A1  - Xu, Zhi-Hong
A1  - Xue, Hong-Wei
T1  - Auxin flow in anther filaments is critical for pollen grain development through regulating pollen mitosis
N2  - It was well known that auxin is critical for anther/pollen grain development, however, the clear distribution and detailed effects of auxin during floral development are still unclear. We have shown here that, through analyzing GUS activities of Arabidopsis lines harboring auxin response elements DR5-GUS, auxin was mainly accumulated in the anther during flower stages 10-12. Further studies employing the indoleacetic acid-lysine synthetase (iaaL) coding gene from Pseudomonas syringae subsp. savastanoi under control of the promoter region of Arabidopsis phosphatidylinositol monophosphate 5-kinase 1 gene, which conducts the anther filament-specific expression, showed that block of auxin flow of filaments resulted in shortened filaments and significantly defective pollen grains. Similar phenotype was observed in tobacco plants transformed with the same construct, confirming the effects of auxin flow in filaments on anther development. Detailed studies further revealed that the meiosis process of pollen grain was normal while the mitosis at later stage was significantly defected, indicating the effects of auxin flow in filaments on pollen grain mitosis process. Analysis employing [C-14]IAA, as well as the observation on the expression of AtPIN1, coding for auxin efflux carrier, demonstrated the presence of polar auxin transport in anther filaments and pollen grains
Y1  - 2006
UR  - http://www.springerlink.com/content/100330
U6  - https://doi.org/10.1007/s11103-006-0005-z
SN  - 0167-4412
ER  - 
TY  - JOUR
A1  - Yan, Xiaoli
A1  - Xue, Zhike
A1  - Jiang, Chaowei
A1  - Priest, E. R.
A1  - Kliem, Bernhard
A1  - Yang, Liheng
A1  - Wang, Jincheng
A1  - Kong, Defang
A1  - Song, Yongliang
A1  - Feng, Xueshang
A1  - Liu, Zhong
T1  - Fast plasmoid-mediated reconnection in a solar flare
JF  - Nature Communications
N2  - Magnetic reconnection is a multi-faceted process of energy conversion in astrophysical, space and laboratory plasmas that operates at microscopic scales but has macroscopic drivers and consequences. 
Solar flares present a key laboratory for its study, leaving imprints of the microscopic physics in radiation spectra and allowing the macroscopic evolution to be imaged, yet a full observational characterization remains elusive. 
Here we combine high resolution imaging and spectral observations of a confined solar flare at multiple wavelengths with data-constrained magnetohydrodynamic modeling to study the dynamics of the flare plasma from the current sheet to the plasmoid scale. The analysis suggests that the flare resulted from the interaction of a twisted magnetic flux rope surrounding a filament with nearby magnetic loops whose feet are anchored in chromospheric fibrils. Bright cusp-shaped structures represent the region around a reconnecting separator or quasi-separator (hyperbolic flux tube). 
The fast reconnection, which is relevant for other astrophysical environments, revealed plasmoids in the current sheet and separatrices and associated unresolved turbulent motions. 
Solar flares provide wide range of observational details about fundamental processes involved. Here, the authors show evidence for magnetic reconnection in a strong confined solar flare displaying all four reconnection flows with plasmoids in the current sheet and the separatrices.
Y1  - 2022
U6  - https://doi.org/10.1038/s41467-022-28269-w
SN  - 2041-1723
VL  - 13
IS  - 1
PB  - Nature Publishing Group UK
CY  - London
ER  -