NDLI: Defects in cytoskeletal microtubule deployment of microsporocytes contribute to fertility loss in genic male-sterile Chinese cabbage

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Defects in cytoskeletal microtubule deployment of microsporocytes contribute to fertility loss in genic male-sterile Chinese cabbage

Content Provider	Springer Nature Link
Author	Fu, Shao Zhang, Ya Nan Wang, Ya Ying Zhu, Xue Yi Tian, Hui Qiao Russell, Scott D.
Copyright Year	2013
Abstract	The microtubular cytoskeleton of male-sterile Chinese cabbage was examined to characterize cytoplasmically based defects during microsporogenesis of fertile and sterile microsporocytes. At the onset of meiosis, microtubules (MTs) in fertile microsporocytes were short and anisotropically oriented in the microsporocyte cytoplasm. As the microsporocytes entered metaphase I, the MTs constructed a bisymmetrical spindle characterized by conspicuous kinetochore fibers closely associated with chromosomes in the medial plane. During anaphase I, interzonal MTs become conspicuous between the two sets of chromosomes and the polar regions become more distant as spindle MTs are depleted, essentially disappearing at telophase I. Radially distributed MTs increased and the microsporocyte entered meiosis II, producing two spindles at angles to one another within the wall of the microsporocyte. Indicative of the completion of anaphase II is the formation of a field of aligned MTs between two non-sister nuclei, after which the cytoplasm produced centripetal furrows, meeting in the center of the cell and dividing it into four microspores at the completion of cytokinesis. In sterile microsporocytes, however, an abnormal arrangement of MTs occurred at the conclusion of anaphase II. Although two spindles formed, the angle and the boundary between the spindles were not maintained. At the onset of telophase II, the two spindles migrated to a central region and laterally fused in irregular orientations in which the decondensing chromatin of the non-sister nuclei may form separate or merged nuclei, followed by irregular cytokinesis. The result of meiosis was 41.8 % two binuclear products, and 58.2 % one diploid and one binuclear sterile products.
Starting Page	55
Ending Page	61
Page Count	7
File Format	PDF
ISSN	21947953
Journal	Plant Reproduction
Volume Number	26
Issue Number	1
e-ISSN	21947961
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chinese cabbage Male sterility Microsporogenesis Microtubules Cell Biology Plant Sciences Agriculture
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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