scholarly journals Comparison of the characterization of allergenic protein 3 (Pla a3) released from Platanus pollen grains collected in Shanghai during the spring of 2019 and 2020

Aerobiologia ◽  
2021 ◽  
Author(s):  
Xingzi Wang ◽  
Shumin Zhou ◽  
Senlin Lu ◽  
Lu Zhang ◽  
Teng Ma ◽  
...  
Keyword(s):  
Pollen Grains ◽  
Allergenic Protein

Pollen characterization of ornamental species of Mammillaria Haw. (Cactaceae/Cactoideae)

2019 ◽  
Vol 6 (1) ◽  
pp. 13 ◽  
Author(s):  
Denise M. D. S. Mouga ◽  
Gabriel R. Schroeder ◽  
Nilton P. Vieira Junior ◽  
Enderlei Dec
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Radial Symmetry ◽  
Morphological Data ◽  
Medium Size ◽  
Ornamental Species

The pollen morphology of thirteen species of Cactaceae was studied: M. backebergiana F.G. Buchenau, M. decipiens Scheidw, M. elongata DC, M. gracilis Pfeiff., M. hahniana Werderm., M. marksiana Krainz, M. matudae Bravo, M. nejapensis R.T. Craig & E.Y. Dawson, M. nivosa Link ex Pfeiff., M. plumosa F.A.C. Weber, M. prolifera (Mill.) Haw, M. spinosissima var. “A Peak” Lem. and M. voburnensis Scheer. All analysed pollen grains are monads, with radial symmetry, medium size (M. gracilis, M. marksiana, M. prolifera, large), tricolpates (dimorphs in M. plumosa [3-6 colpus] and M. prolifera [3-6 colpus]), with circular-subcircular amb (quadrangular in M. prolifera and M. plumosa with six colpus). The pollen grains presented differences in relation to the shape and exine thickness. The exine was microechinate and microperforated. The pollen morphological data are unpublished and will aid in studies that use pollen samples. These pollen grains indicate ornamental cacti.

scholarly journals Reproductive characterization of interspecific hybrids among Capsicum species

2011 ◽  
Vol 11 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Carlos Eduardo da Silva Monteiro ◽  
Telma Nair Santana Pereira ◽  
Karina Pereira de Campos
Keyword(s):  
Male Sterility ◽  
Interspecific Hybrids ◽  
Pollen Viability ◽  
Pollen Grains ◽  
Male Sterile ◽  
Viable Pollen ◽  
Hybrid Combination ◽  
Capsicum Species ◽  
The Cross

The objective of this study was the reproductive characterization of Capsicum accessions as well as of interspecific hybrids, based on pollen viability. Hybrids were obtained between Capsicum species. Pollen viability was high in most accessions, indicating that meiosis is normal, resulting in viable pollen grains. The pollen viability of species C. pubescens was the lowest (27 %). The interspecific hybrids had varying degrees of pollen viability, from fertile combinations (C. chinense x C. frutescens and C. annuum x C. baccatum) to male sterile combinations. Pollen viability also varied within the hybrid combination according to accessions used in the cross. Results indicate that male sterility is one of the incompatibility barriers among Capsicum species since hybrids can be established, but may be male sterile.

scholarly journals snRNP: Rich Nuclear Bodies inHyacinthus orientalisL. Microspores and Developing Pollen Cells

2009 ◽  
Vol 2009 ◽  
pp. 1-12 ◽  
Author(s):  
K. Zienkiewicz ◽  
E. Bednarska
Keyword(s):  
Pollen Development ◽  
Rna Synthesis ◽  
Generative Cell ◽  
Pollen Grains ◽  
Strong Relationship ◽  
Nuclear Bodies ◽  
Cajal Body ◽  
Sm Proteins ◽  
Hyacinthus Orientalis

The aim of the present work was the characterization of nuclear bodies in the microspore and developing pollen cells ofHyacinthus orientalisL.. The combination of Ag-NOR, immunofluorescence and immunogold techniques was used in this study. The obtained results showed the presence of highly agyrophylic extranucleolar bodies in microspore and developing pollen cells, which were finally identified as Cajal bodies. In all cases, a strong accumulation of snRNP-indicating molecules including TMG cap, Sm proteins and U2 snRNA, was observed in the examined nuclear bodies. In contrast to their number the size of the identified structures did not change significantly during pollen development. In the microspore and the vegetative cell of pollen grains CBs were more numerous than in the generative cell. At later stages of pollen development, a drastic decrease in CB number was observed and, just before anthesis, a complete lack of these structures was indicated in both pollen nuclei. On the basis of these results, as well as our previous studies, we postulate a strong relationship between Cajal body numbers and the levels of RNA synthesis and splicing machinery elements in microspore and developing pollen cells.

Isolation and Characterization of Viable Sperm Cells from Tricellular Pollen Grains

1988 ◽  
pp. 245-250 ◽  
Author(s):  
E. Matthys-Rochon ◽  
S. Detchepare ◽  
V. Wagner ◽  
P. Roeckel ◽  
C. Dumas
Keyword(s):  
Pollen Grains ◽  
Sperm Cells ◽  
Isolation And Characterization ◽  
Viable Sperm

Molecular analysis of the maize wx-B3 allele indicates that precise excision of the transposable Ac element is rare.

Genetics ◽  
1992 ◽  
Vol 130 (2) ◽  
pp. 377-384 ◽  
Author(s):  
G Baran ◽  
C Echt ◽  
T Bureau ◽  
S Wessler
Keyword(s):  
Insertion Site ◽  
Pollen Grains ◽  
Genetic Maps ◽  
Null Alleles ◽  
P Elements ◽  
Ac Element ◽  
Precise Excision ◽  
Wx Gene ◽  
Low Levels

Abstract The somatic and germinal behavior of the maize wx-B3 mutation indicates that this Ac allele rarely reverts. Endosperms containing wx-B3 display tiny and infrequent Wx revertant sectors while no significant reversion is detected when wx-B3 pollen is stained with I/KI. Previous studies of other transposable element alleles that revert infrequently have implicated low levels of element excision. Unlike these other alleles, the wx-B3 Ac element is indistinguishable from fully active Ac elements with respect to its structure, and its ability to transpose from the Wx gene or to trans-activate a Ds element. Characterization of somatic and germinal excision events lead us to conclude that excision of the wx-B3 Ac element almost always produces null alleles. Furthermore, the excellent correlation between the position of the wx-B3 mutation on the physical and genetic maps indicates that the Ac insertion is the only lesion of wx-B3. As a result, precise excision of this Ac should restore Wx function. The fact that revertant sectors and pollen grains are rare indicates that precise excision of Ac is also rare. The finding that the wx-B3 reversion frequency is comparable whether wx-B3 is hemizygous or over a wx allele with a wild-type insertion site illustrates a fundamental difference between the excision mechanisms of Ac and Drosophila P elements.

Flowering and morphological characterization of Dendrocalamus asper androecium and pollen grains

Grana ◽  
2020 ◽  
pp. 1-15
Author(s):  
Priscila Fernandes De Souza ◽  
Cristina M. Ribas Dos Santos ◽  
Joseph Ree ◽  
Miguel Pedro Guerra ◽  
Rosete Pescador
Keyword(s):  
Pollen Grains ◽  
Morphological Characterization ◽  
Dendrocalamus Asper

scholarly journals Morphological Characterization of Tetraploids of Limonium sinuatum (L.) Mill. Produced by Oryzalin Treatment of Seeds

Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 248
Author(s):  
Shiro Mori ◽  
Masaki Yahata ◽  
Ayano Kuwahara ◽  
Yurina Shirono ◽  
Yasufumi Ueno ◽  
...  
Keyword(s):  
Pollen Grains ◽  
Type A ◽  
Morphological Characterization ◽  
Ornamental Plant ◽  
Type B ◽  
Stomatal Size ◽  
Chimeric Plant ◽  
L1 And L2 ◽  
Polyploidy Breeding

Limonium sinuatum (L.) Mill. (2n = 2x = 16) is a popular ornamental plant with dimorphism of pollen grains (type A and type B) and stigmas (papilla and cob-like). We applied polyploidy breeding to this species in order to introduce desirable traits. Tetraploid and mixoploid L. sinuatum plants were successfully obtained with oryzalin treatment of L. sinuatum ‘Early Blue’ seeds. All three tetraploids had increased leaf width, stomatal size, flower length, and pollen width compared to those of the diploid, and tetraploids had four germinal pores of pollen grains, whereas the diploid had three. All tetraploids had type A pollen grains and cob-like stigmas. Furthermore, the growth of cultivated tetraploid plants was slow, with later bolting and flowering times. Mixoploids Mixo-1 and Mixo-3 were estimated to be polyploidy periclinal chimeric plants consisting of a tetraploid L1 layer and diploid L2 layer, and Mixo-2 was estimated to be a polyploidy periclinal chimeric plant consisting of the diploid L1 layer and tetraploid L2 layer. Mixo-4 had tetraploid L1 and L2 layers. Mixoploids, except Mixo-4, had type A pollen grains and cob-like stigmas, whereas Mixo-4 had type B pollen grains and papilla stigmas. These polyploids will be useful as polyploidy breeding materials.

scholarly journals Concentration of pollen of Chenopodiaceae/Amaranthaceae plants in the air of selected Polish cities in 2020

Alergoprofil ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 34-40
Author(s):  
Krystyna Piotrowska-Weryszko ◽  
Elżbieta Weryszko-Chmielewska ◽  
Aneta Sulborska ◽  
Małgorzata Puc ◽  
Małgorzata Malkiewicz ◽  
...  
Keyword(s):  
Pollen Season ◽  
Pollen Grains ◽  
Volumetric Method ◽  
Low Risk ◽  
Southern Europe ◽  
Warm Climate ◽  
Plant Family ◽  
Pollen Concentrations ◽  
Low Precipitation

Various concentrations of Chenopodiaceae/Amaranthaceae pollen are detected in the air of many regions of Europe. The highest content of pollen produced by the taxon is reported in southern Europe and in other countries with a warm climate and low precipitation sums. The study was focused on characterization of the Chenopodiaceae/Amaranthaceae pollen season in 11 Polish cities: Bialystok, Bydgoszcz, Cracow, Lublin, Olsztyn, Piotrkow Trybunalski, Sosnowiec, Szczecin, Warsaw, Wroclaw, and Zielona Gora in 2020. The volumetric method based on the use of the Lanzoni or Burkard pollen sampler was employed in the study. In 2020, the pollen season in the analyzed plant family began in the second half of June and ended during the first ten days of October. The earliest pollen season onset was recorded in Lublin (13.06) and Szczecin (14.06), whereas the latest beginning was noted in Wroclaw (5.07). The earliest and latest end of the pollen season was recorded in Bialystok (6.09) and in Olszyn (5.10), respectively. In terms of length, the season was characterized by the shortest duration in Wroclaw (70 days) and the longest duration in Olsztyn (106 days). In most of the analyzed cities, maximum pollen concentrations were detected in the second half of August, and the highest values were recorded in Zielona Gora and Sosnowiec. Compared to 2019 and 2018, relatively low sums of the annual concentrations of Chenopodiaceae/Amaranthaceae pollen grains, i.e. in the range of 35-231, were recorded in Poland in 2020. The highest values of this parameter were reported in Olsztyn (231) and Lublin (230), whereas the lowest value was noted in Bialystok (35). The relatively low maximum concentrations of Chenopodiaceae/Amaranthaceae pollen recorded during the study year indicate a low risk of development of allergy symptoms induced by the presence of pollen of this taxon in the air.

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