scholarly journals Development of the Middle Layer in the Anther of Arabidopsis

2021 ◽  
Vol 12 ◽  
Author(s):  
Jing-Shi Xue ◽  
Chi Yao ◽  
Qin-Lin Xu ◽  
Chang-Xu Sui ◽  
Xin-Lei Jia ◽  
...  
Keyword(s):  
Cell Division ◽  
Fluorescent Proteins ◽  
Middle Layer ◽  
Live Imaging ◽  
Anther Development ◽  
Anther Wall ◽  
Fundamental Information ◽  
Stage 4 ◽  
Cell Layers ◽  
Staining Methods

The middle layer is an essential cell layer of the anther wall located between the endothecium and tapetum in Arabidopsis. Based on sectioning, the middle layer was found to be degraded at stage 7, which led to the separation of the tapetum from the anther wall. Here, we established techniques for live imaging of the anther. We created a marker line with fluorescent proteins expressed in all anther layers to study anther development. Several staining methods were used in the intact anthers to study anther cell morphology. We clarified the initiation, development, and degradation of the middle layer in Arabidopsis. This layer is initiated from both the inner and outer secondary parietal cells at stage 4, stopped cell division at stage 6, and finally degraded at stage 11. The neighboring cell layers, the epidermis, and endothecium continued cell division until stage 10, which led to a thin middle layer. The degradation of the tapetum cell wall at stage 7 lead to its isolation from the anther wall. This work presents fundamental information on the development of the middle layer, which facilitates the further investigation of anther development and plant fertility. These live imaging methods could be useful in future studies.

scholarly journals Dynamics of Polysaccharides and Neutral Lipids during Anther Development in Castor (Ricinus communis)

2015 ◽  
Vol 140 (4) ◽  
pp. 356-361 ◽  
Author(s):  
Dongmei Wei ◽  
Huimin Xu ◽  
Ruili Li
Keyword(s):  
Neutral Lipids ◽  
Ricinus Communis ◽  
Starch Content ◽  
Single Layer ◽  
Pollen Grains ◽  
Middle Layer ◽  
Anther Development ◽  
Anther Wall ◽  
Starch Grains ◽  
Tapetal Cells

Anthers contain starch and neutral lipids, which have key roles in microspore ontogeny and gametophyte development. In this study, we observed the dynamic changes in starch and neutral lipids in the anther developmental processes of castor (Ricinus communis) by cytochemical methods. Starch grains and neutral lipids presented a regular dynamic distribution during anther development. In young anthers, some neutral lipids accumulated in sporogenous cells, whereas neutral lipids disappeared with microspore growth. At the late microspore stage, starch grains began to accumulate in microspores, and the starch content of bicellular pollen significantly increased after microspore mitosis. At anthesis, starch grains and neutral lipids accumulated in the mature pollen grains. Visible changes occurred in anther wall cells. The epidermis, middle layer, and tapetum were degenerated, and only a single layer of endothecium remained at anthesis. The dynamic variation of starch grains and neutral lipids in tapetal cells was consistent with the changes in microspores and pollen during anther development. All these findings demonstrated that tapetal cells directly interacted with the developing gametophytes. The tapetal cells play an important role in supplying nutritional substances for microspore absorption. Moreover, the endothecium protects the pollen and contributes to anther dehiscence. The results of this study provide a foundation for the further research on sexual reproduction in angiosperms.

Embryology of the dioecious Australian endemic Lomandra longifolia (Lomandraceae)

2008 ◽  
Vol 56 (8) ◽  
pp. 651 ◽  
Author(s):  
Nabil M. Ahmad ◽  
Peter M. Martin ◽  
John M. Vella
Keyword(s):  
Middle Layer ◽  
Endosperm Development ◽  
Anther Wall ◽  
Polygonum Type ◽  
Cell Functions ◽  
Mature Ovule ◽  
Cell Layers ◽  
Nucellar Tissue ◽  
Successive Cytokinesis ◽  
Dermal Cells

Microsporogenesis, embryogeny and endosperm development of Lomandra longifolia Labill. are described in detail. The formation of the anther wall is the basic type composed of four cell layers, namely an epidermis, an endothecium, one middle layer and a tapetum. The tapetum layer has glandular, uninucleate cells. Successive cytokinesis follows meiosis, subsequently forming a tetrahedral tetrad of microspores. The ovule in each carpel is hemitropous, crassinucellate and bitegmic, with the micropyle formed by the inner integument. The archesporial cell divides periclinally to form the primary parietal and primary sporogenous cells. The sporogenous cell functions as the megaspore mother cell, whereas the parietal cell divides to give rise to two parietal layers. The mature megagametophyte, which has enlarged synergids and antipodals, is of the Polygonum type, with the normal complement of seven cells and eight nuclei. Nucellar tissue in the mature ovule consists of enlarged dermal cells and irregular subdermal cells surrounding a central strand of markedly smaller cells. Endosperm development is of the nuclear type. Embryo development is of the Graminad type, characterised by oblique zygotic and early pro-embryonic divisions.

scholarly journals A Cytological Study of Anther and Pollen Development in Chinquapin (Castanea henryi)

HortScience ◽  
2020 ◽  
Vol 55 (6) ◽  
pp. 945-950
Author(s):  
Weiping Zhong ◽  
Zhoujun Zhu ◽  
Fen Ouyang ◽  
Qi Qiu ◽  
Xiaoming Fan ◽  
...  
Keyword(s):  
Pollen Development ◽  
Lipid Droplets ◽  
Morphological Characteristics ◽  
Pollen Grains ◽  
Middle Layer ◽  
Anther Development ◽  
Mature Pollen ◽  
Anther Wall ◽  
Male Flowers ◽  
Microspore Stage

The normal development of anthers and the formation of functional pollen are the prerequisites for successful pollination and fertilization. In this study, we observed dynamic changes in inflorescence and anther development in the chinquapin (Castanea henryi) using stereomicroscopy, light microscopy, and transmission electron microscopy. We found that cytokinesis during meiosis in microsporocytes was of the simultaneous type, and that the tetrads were mainly tetrahedral. Mature pollen grains contained two cells with three germ pores. The anther wall was of the basic type and composed of epidermis, endothecium, middle layers, and tapetum. Mature anthers had no middle layer and tapetum. The tapetum was of the glandular type. At the early microspore stage, a large number of starch granules appeared in the endothecium, which was deformed at the late microspore stage. Lipid droplets appeared in tapetum during the early microspore stage, and a few lipid droplets were still found during tapetum degeneration. The mature pollen accumulated a large amount of starch and lipids. These findings demonstrated that the anther wall provides nutrients and protection for pollen development. There is relatively stable correspondence between the external morphological characteristics of male flowers and internal structure of anther development.

scholarly journals Live-imaging fluorescent proteins in mouse embryos: multi-dimensional, multi-spectral perspectives

2009 ◽  
Vol 27 (5) ◽  
pp. 266-276 ◽  
Author(s):  
Sonja Nowotschin ◽  
Guy S. Eakin ◽  
Anna-Katerina Hadjantonakis
Keyword(s):  
Fluorescent Proteins ◽  
Live Imaging ◽  
Mouse Embryos

Illuminating subcellular structures and dynamics in plants: a fluorescent protein toolboxThis review is one of a selection of papers published in the Special Issue on Plant Cell Biology.

2006 ◽  
Vol 84 (4) ◽  
pp. 515-522 ◽  
Author(s):  
Preetinder K. Dhanoa ◽  
Alison M. Sinclair ◽  
Robert T. Mullen ◽  
Jaideep Mathur
Keyword(s):  
Plant Cell ◽  
Cell Biology ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Live Imaging ◽  
Living Cells ◽  
Special Issue ◽  
Exciting Possibility ◽  
Selection Of

The discovery and development of multicoloured fluorescent proteins has led to the exciting possibility of observing a remarkable array of subcellular structures and dynamics in living cells. This minireview highlights a number of the more common fluorescent protein probes in plants and is a testimonial to the fact that the plant cell has not lagged behind during the live-imaging revolution and is ready for even more in-depth exploration.

scholarly journals The Plastid of Toxoplasma gondii Is Divided by Association with the Centrosomes

2000 ◽  
Vol 151 (7) ◽  
pp. 1423-1434 ◽  
Author(s):  
Boris Striepen ◽  
Michael J. Crawford ◽  
Michael K. Shaw ◽  
Lewis G. Tilney ◽  
Frank Seeber ◽  
...  
Keyword(s):  
Cell Division ◽  
Toxoplasma Gondii ◽  
Genetic Manipulation ◽  
Fluorescent Proteins ◽  
Recombinant Expression ◽  
Molecular Genetic ◽  
Time Lapse ◽  
Microtubule Organization ◽  
Apicomplexan Parasites ◽  
Daughter Cells

Apicomplexan parasites harbor a single nonphotosynthetic plastid, the apicoplast, which is essential for parasite survival. Exploiting Toxoplasma gondii as an accessible system for cell biological analysis and molecular genetic manipulation, we have studied how these parasites ensure that the plastid and its 35-kb circular genome are faithfully segregated during cell division. Parasite organelles were labeled by recombinant expression of fluorescent proteins targeted to the plastid and the nucleus, and time-lapse video microscopy was used to image labeled organelles throughout the cell cycle. Apicoplast division is tightly associated with nuclear and cell division and is characterized by an elongated, dumbbell-shaped intermediate. The plastid genome is divided early in this process, associating with the ends of the elongated organelle. A centrin-specific antibody demonstrates that the ends of dividing apicoplast are closely linked to the centrosomes. Treatment with dinitroaniline herbicides (which disrupt microtubule organization) leads to the formation of multiple spindles and large reticulate plastids studded with centrosomes. The mitotic spindle and the pellicle of the forming daughter cells appear to generate the force required for apicoplast division in Toxoplasma gondii. These observations are discussed in the context of autonomous and FtsZ-dependent division of plastids in plants and algae.

scholarly journals Improvement of Selected Induction Culture Media on Callus Induction in Anther Culture of Anthurium and a Histological Study on its Callus Formation

2012 ◽  
Vol 12 (2) ◽  
pp. 93 ◽  
Author(s):  
Budi Winarto ◽  
Nurhayati Ansori Mattjik ◽  
Agus Purwito ◽  
Budi Marwoto
Keyword(s):  
Anther Culture ◽  
Callus Induction ◽  
Culture Media ◽  
Callus Formation ◽  
Histological Study ◽  
Block Design ◽  
Middle Layer ◽  
Shoot Formation ◽  
Anther Wall ◽  
Randomized Complete Block Design

Improvement of selected induction culture media on callus induction in anther culture of anthurium and a histologicalstudy on its callus formation were studied at the tissue culture laboratory of the Indonesian Ornamental CropsResearch Institute from February to October 2008. The objectives of the study were to optimize selected media forcallus formation, reveal cell origin of callus derived from anther culture and shoot formation process. Selectedmedia improved in the study were 1) MMS-TBN containing 0,5 mg/l TDZ, 1,0 mg/l BAP and 0,01 mg/l NAA (Winartomedium, WM) and 2) MMS III supplemented with 1,5 mg/l TDZ, 0,75 mg/l BAP and 0,02 mg/l NAA (Winarto andRachmawati medium, WRM). Improvement treatments were carried out by omission and application of 2,4-D in 0.5mg/l and reduction of medium strength of full, half, quarter, one eighth, one sixteenth, and zero strength. Afactorial experiment was arranged using a randomized complete block design with four replications. Results ofthis study indicated that the highest callus induction was clearly established in WRM. The medium stimulatedpotential growth of anther (PGA) up to 81% with 49% of percentage of anther regeneration (PAR) and 2.7 number ofcallus formed per replication (NCF). Significant improvement in callus formation was also recorded by reduction ofmedium strength of WRM to one eighth compared to others. The reduction induced PGA up to 58% with 29% of PARand 1.8 NCF. From histological studies it was well recognized that regenerated callus on half anthers cultured wasoriginated from middle layer cells of anther wall. The morphogenic response of anther wall cells caused primarilyon no androgenesis effect in microspore cells.

scholarly journals Continuous live imaging of adult neural stem cell division and lineage progression in vitro

Development ◽  
2011 ◽  
Vol 138 (6) ◽  
pp. 1057-1068 ◽  
Author(s):  
M. R. Costa ◽  
F. Ortega ◽  
M. S. Brill ◽  
R. Beckervordersandforth ◽  
C. Petrone ◽  
...  
Keyword(s):  
Stem Cell ◽  
Cell Division ◽  
Neural Stem Cell ◽  
Live Imaging ◽  
Adult Neural Stem Cell ◽  
Stem Cell Division

scholarly journals Probing for Binding Regions of the FtsZ Protein Surface through Site-Directed Insertions: Discovery of Fully Functional FtsZ-Fluorescent Proteins

2016 ◽  
Vol 199 (1) ◽  
Author(s):  
Desmond A. Moore ◽  
Zakiya N. Whatley ◽  
Chandra P. Joshi ◽  
Masaki Osawa ◽  
Harold P. Erickson
Keyword(s):  
Cell Division ◽  
Fluorescent Proteins ◽  
Sole Source ◽  
Ring Structure ◽  
Content Type ◽  
Z Ring ◽  
Complete Cell ◽  
The Right

ABSTRACT FtsZ, a bacterial tubulin homologue, is a cytoskeletal protein that assembles into protofilaments that are one subunit thick. These protofilaments assemble further to form a “Z ring” at the center of prokaryotic cells. The Z ring generates a constriction force on the inner membrane and also serves as a scaffold to recruit cell wall remodeling proteins for complete cell division in vivo. One model of the Z ring proposes that protofilaments associate via lateral bonds to form ribbons; however, lateral bonds are still only hypothetical. To explore potential lateral bonding sites, we probed the surface of Escherichia coli FtsZ by inserting either small peptides or whole fluorescent proteins (FPs). Among the four lateral surfaces on FtsZ protofilaments, we obtained inserts on the front and back surfaces that were functional for cell division. We concluded that these faces are not sites of essential interactions. Inserts at two sites, G124 and R174, located on the left and right surfaces, completely blocked function, and these sites were identified as possible sites for essential lateral interactions. However, the insert at R174 did not interfere with association of protofilaments into sheets and bundles in vitro. Another goal was to find a location within FtsZ that supported insertion of FP reporter proteins while allowing the FtsZ-FPs to function as the sole source of FtsZ. We discovered one internal site, G55-Q56, where several different FPs could be inserted without impairing function. These FtsZ-FPs may provide advances for imaging Z-ring structure by superresolution techniques. IMPORTANCE One model for the Z-ring structure proposes that protofilaments are assembled into ribbons by lateral bonds between FtsZ subunits. Our study excluded the involvement of the front and back faces of the protofilament in essential interactions in vivo but pointed to two potential lateral bond sites, on the right and left sides. We also identified an FtsZ loop where various fluorescent proteins could be inserted without blocking function; these FtsZ-FPs functioned as the sole source of FtsZ. This advance provides improved tools for all fluorescence imaging of the Z ring and may be especially important for superresolution imaging.

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