scholarly journals Gibberellin Induces Diploid Pollen Formation by Interfering with Meiotic Cytokinesis

2016 ◽  
Vol 173 (1) ◽  
pp. 338-353 ◽  
Author(s):  
Bing Liu ◽  
Nico De Storme ◽  
Danny Geelen
Keyword(s):  
Diploid Pollen ◽  
Pollen Formation

Mago Nashi is involved in meristem organization, pollen formation, and seed development in Arabidopsis

Plant Science ◽  
2009 ◽  
Vol 176 (4) ◽  
pp. 461-469 ◽  
Author(s):  
Nam-Il Park ◽  
Edward C. Yeung ◽  
Douglas G. Muench
Keyword(s):  
Seed Development ◽  
Pollen Formation ◽  
Mago Nashi

CYTOLOGY OF 2n POLLEN FORMATION IN DIPLOID ALFALFA, MEDICAGO SATIVA

1979 ◽  
Vol 21 (4) ◽  
pp. 525-530 ◽  
Author(s):  
Nicholi Vorsa ◽  
E. T. Bingham
Keyword(s):  
Medicago Sativa ◽  
Seed Set ◽  
Pollen Grains ◽  
Genetic Constitution ◽  
2N Pollen ◽  
Diploid Parent ◽  
2N Gamete ◽  
Medicago Sativa L ◽  
Pollen Formation ◽  
Mother Cells

Four diploid (2x) clones of alfalfa, Medicago sativa L., which produced good seed set when used as male parents in 4x-2x crosses were selected for study. The 2x clones descended from 2x haploids of cultivated 4x alfalfa. Fertility in the 4x-2x cross was due to the production of pollen with the unreduced chromosome number (2n pollen) from the 2x parent. The cytological mechanism of 2n pollen formation was found to be disorientation of spindles at metaphase II in up to 38% of the pollen mother cells. Thus, both n and 2n pollen were produced by all four diploids examined. Normal spindles at metaphase II were oriented such that they defined the poles of a tetrahedron and resulted in normal tetrads in a tetrahedral arrangement. Disoriented spindles were basically parallel to each other and resulted in formation of dyads and occasionally a triad. Dyads developed into two 2n pollen grains; triads developed into one 2n and two n pollen grains. Since both n and 2n pollen grains are produced by the diploids, they can be maintained as diploids or they can be used as male parents in crosses to tetraploids. The genetic constitution of 2n pollen resulting from parallel spindles is similar to that expected after first division restitution of meiosis and much of the heterozygosity of the diploid parent is conserved in the gametes. The 2n gamete mechanism has potential application in germplasm transfer and in maximizing heterozygosity in tetraploid hybrids.

scholarly journals Mutations in AtPS1 (Arabidopsis thaliana Parallel Spindle 1) Lead to the Production of Diploid Pollen Grains

PLoS Genetics ◽  
2008 ◽  
Vol 4 (11) ◽  
pp. e1000274 ◽  
Author(s):  
Isabelle d'Erfurth ◽  
Sylvie Jolivet ◽  
Nicole Froger ◽  
Olivier Catrice ◽  
Maria Novatchkova ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Pollen Grains ◽  
Diploid Pollen

scholarly journals Pollination requirements of seeded and seedless mini watermelon varieties cultivated under protected environment

2015 ◽  
Vol 50 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Isac Gabriel Abrahão Bomfim ◽  
Antônio Diego de Melo Bezerra ◽  
Alexandre Campos Nunes ◽  
Breno Magalhães Freitas ◽  
Fernando Antonio Souza de Aragão
Keyword(s):  
Fruit Quality ◽  
Fruit Set ◽  
Floral Biology ◽  
Cross Pollination ◽  
Diploid Pollen

The objective of this work was to evaluate the floral biology and pollination requirements of seeded and seedless mini watermelon varieties, and to determine the best varieties to cultivate under protected environment. Three seedless (HA-5106, HA-5158, and HA-5161) and two seeded (Minipol and Polimore) genotypes were tested. Flowers were monitored from the pre-anthesis stage to senescence, and fruit quality was also evaluated. The evaluated treatments were hand-geitonogamous pollination (MG), cross-pollination with pollen from the Polimore variety (MCP), cross-pollination with pollen from the Minipol variety (MCM), and restricted pollination. All varieties had monoecious plants with diclinous flowers, and the stigmas remained receptive throughout anthesis. Fruit set rates of 84.62% (MG), 61.54% (MCP), 48% (MCM), and 0% (restricted) were obtained for seeded varieties, but of 0% (MG), 76.36% (MCP), 82.69% (MCM), and 0% (restricted) for seedless varieties. Fruits did not differ in quality among treatments within each genotype. Therefore, all the studied varieties require a pollination agent and diploid pollen for fruit set to occur, regardless of the donor variety; and Minipol or Polimore with HA-5106 or HA-5158 are the varieties recommended for cultivation in protected environment.

Pollen Formation, Development of the Pollen Wall and Tapetum

2019 ◽  
pp. 9-15
Author(s):  
Shripad N. Agashe ◽  
Eric Caulton
Keyword(s):  
Pollen Wall ◽  
Pollen Formation

scholarly journals Microsporogenesis and pollen formation in Larch Sukachev (Larix Sukaczewii Djil.) on permanent forest seed plot in Semiluksky forestry

2021 ◽  
Vol 25 (3) ◽  
pp. 42-48
Author(s):  
E.E. Kulakov ◽  
◽  
A.I. Sivolapov ◽  
Keyword(s):  
Significant Proportion ◽  
Spherical Shape ◽  
Pollen Size ◽  
Seed Plot ◽  
Male And Female ◽  
Division Spindle ◽  
Sterile Pollen ◽  
Pollen Formation ◽  
Sukachev Larch

The formation of male and female generative buds in the Sukachev larch in the conditions of Voronezh in the second decade of August is considered. The behavior of chromosomes in the meta-, ana -, and telophase of the first and second divisions of meiosis is analyzed. In each phase, 150–200 microsporocytes were taken into account. According to the results of the conducted studies, it was revealed that the microsporogenesis of larch proceeded asynchronously. A significant proportion of the disorders are caused by chromosome lag and the formation of bridges, the formation of a hexad, and the release of chromosomes outside the division spindle. The viability of Sukachev larch pollen is estimated to be high. A small number of disturbances in the process of meiotic divisions and the formation of gametophytes did not lead to the formation of a significant amount of sterile pollen. The average pollen size varies between 82.18–86.4 microns. Pollen has a spherical shape

Cytological mechanisms of 2n pollen formation in the wild potato Solanum okadae and pollen-pistil relations with the cultivated potato, Solanum tuberosum

2007 ◽  
Vol 55 (3) ◽  
pp. 471-477 ◽  
Author(s):  
Elsa Lucila Camadro ◽  
Sandra Karina Saffarano ◽  
Juan Carlos Espinillo ◽  
Mateo Castro ◽  
Phillip W. Simon
Keyword(s):  
Solanum Tuberosum ◽  
Wild Potato ◽  
2N Pollen ◽  
Cultivated Potato ◽  
In The Wild ◽  
Pollen Formation

scholarly journals The Conserved Chimeric Transcript UPGRADE2 Is Associated with Unreduced Pollen Formation and Is Exclusively Found in Apomictic Boechera Species

2013 ◽  
Vol 163 (4) ◽  
pp. 1640-1659 ◽  
Author(s):  
M. Mau ◽  
J. M. Corral ◽  
H. Vogel ◽  
M. Melzer ◽  
J. Fuchs ◽  
...  
Keyword(s):  
Chimeric Transcript ◽  
Unreduced Pollen ◽  
Pollen Formation
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