Abstract：
:This is the first report on gamma-tubulin and microtubule arrays during microsporogenesis in a gymnosperm. Meiosis in Ginkgo biloba is polyplastidic, as is typical of the spermatophyte clade, and microtubule arrays are organized at various sites during meiosis and cytokinesis. In early prophase, a cluster of gamma-tubulin globules occurs in the central cytoplasm adjacent to the off-center nucleus. These globules diminish in size and spread over the surface of the nucleus. A system of microtubules focused on the gamma-tubulin forms a reticulate pattern in the cytoplasm. As the nucleus migrates to the center of the microsporocyte, gamma-tubulin becomes concentrated at several sites adjacent to the nuclear envelope. Microtubules organized at these foci of gamma-tubulin give rise to a multipolar prophase spindle. By metaphase I, the spindle has matured into a distinctly bipolar structure with pointed poles. In both first and second meiosis, gamma-tubulin becomes distributed throughout the metaphase spindles, but becomes distinctly polar again in anaphase. In telophase I, gamma-tubulin moves from polar regions to the proximal surface of chromosome groups/nuclei where interzonal microtubules are organized. No cell wall is deposited and the interzonal microtubules embrace a plate of organelles between the two nuclear cytoplasmic domains (NCDs) of the dyad. Following second meiosis, phragmoplasts that form between sister and non-sister nuclei fuse to form a complex six-sided structure that directs simultaneous cytokinesis. Gamma-tubulin becomes associated with nuclei after both meiotic divisions and is especially conspicuous in the distal hemisphere of each young microspore where an unusual encircling system of cortical microtubules develops.
journal_name
J Plant Resjournal_title
Journal of plant researchauthors
Brown RC,Lemmon BEdoi
10.1007/s10265-005-0199-1subject
Has Abstractpub_date
2005-04-01 00:00:00pages
121-8issue
2eissn
0918-9440issn
1618-0860journal_volume
118pub_type
杂志文章abstract：:Although touch responses of plant roots are an important adaptive behavior, the molecular mechanism remains unclear. We have developed a bioassay for measuring root-bending responses to physical hardness in Arabidopsis thaliana seedlings. Our test requires a two-layer solid medium. Primary roots growing downward throu...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-008-0178-4
更新日期：2008-09-01 00:00:00
abstract：:Recent progress in the study of cytokinin metabolism in plants indicates that quantitative analysis of cytokinin nucleotides is essential for elucidation of early steps of the biosynthetic pathway. However, traditional procedures for purification and quantification of cytokinin cannot discriminate the various nucleoti...
journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2003-06-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-006-0044-1
更新日期：2007-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-015-0772-1
更新日期：2016-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2012-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-008-0191-7
更新日期：2009-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0903-3
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-009-0252-6
更新日期：2009-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/BF02344552
更新日期：1996-12-01 00:00:00
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pub_type： 杂志文章
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更新日期：2003-02-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-014-0632-4
更新日期：2014-05-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2013-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2019-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-013-0575-1
更新日期：2013-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2020-07-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-014-0661-z
更新日期：2014-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2004-02-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2016-07-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
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更新日期：2002-08-01 00:00:00
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journal_title：Journal of plant research
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journal_title：Journal of plant research
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journal_title：Journal of plant research
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更新日期：2008-09-01 00:00:00
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journal_title：Journal of plant research
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更新日期：2008-01-01 00:00:00
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journal_title：Journal of plant research
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更新日期：2017-01-01 00:00:00
