نتایج جستجو برای: pollen

تعداد نتایج: 20847  

2013
Yuuri Hirooka Mitsuteru Akiba Yu Ichihara Hayato Masuya Yoshihiro Takahata Tomohisa Suda Yutaka Yada Shigehiro Yamamoto Takanori Kubono

In Japan, Japanese cedar pollen dispersal is one of the major causes of pollinosis. Sydowia japonica is an ascomycetous fungus that grows exclusively on the male strobili of Japanese cedar, suggesting a possible mechanism for controlling pollen dispersal. To evaluate this possibility, eleven isolates of S. japonica were collected from around Japan and used as an inoculum to male strobili of Jap...

2013
Mohamed Elfatih H. Bashir Jan Hsi Lui Ravishankar Palnivelu Robert M. Naclerio Daphne Preuss

BACKGROUND/AIM Pollen grains are the male gametophytes that deliver sperm cells to female gametophytes during sexual reproduction of higher plants. Pollen is a major source of aeroallergens and environmental antigens. The pollen coat harbors a plethora of lipids that are required for pollen hydration, germination, and penetration of the stigma by pollen tubes. In addition to proteins, pollen di...

2014
Kirk E Anderson Mark J Carroll Tim Sheehan Brendon M Mott Patrick Maes Vanessa Corby-Harris

Honey bee hives are filled with stored pollen, honey, plant resins and wax, all antimicrobial to differing degrees. Stored pollen is the nutritionally rich currency used for colony growth and consists of 40-50% simple sugars. Many studies speculate that prior to consumption by bees, stored pollen undergoes long-term nutrient conversion, becoming more nutritious 'bee bread' as microbes predigest...

Journal: :The Journal of experimental biology 2014
Elizabeth Nicholls Natalie Hempel de Ibarra

In contrast to the wealth of knowledge concerning sucrose-rewarded learning, the question of whether bees learn when they collect pollen from flowers has been little addressed. The nutritional value of pollen varies considerably between species, and it may be that bees learn the features of flowers that produce pollen best suited to the dietary requirements of their larvae. It is still unknown,...

Journal: :Plant physiology 2015
Christelle Leroux Sophie Bouton Marie-Christine Kiefer-Meyer Tohnyui Ndinyanka Fabrice Alain Mareck Stéphanie Guénin Françoise Fournet Christoph Ringli Jérôme Pelloux Azeddine Driouich Patrice Lerouge Arnaud Lehner Jean-Claude Mollet

Germination of pollen grains is a crucial step in plant reproduction. However, the molecular mechanisms involved remain unclear. We investigated the role of PECTIN METHYLESTERASE48 (PME48), an enzyme implicated in the remodeling of pectins in Arabidopsis (Arabidopsis thaliana) pollen. A combination of functional genomics, gene expression, in vivo and in vitro pollen germination, immunolabeling,...

2009
L. M. Sosnoskie T. M. Webster D. Dales G. C. Rains T. L. Grey A. S. Culpepper

Palmer amaranth is resistant to several herbicides, including glyphosate, and there is concern that the resistance traits can be transferred between spatially segregated populations via pollen movement. The objective of this study was to describe the physical properties of Palmer amaranth pollen, specifically size, density, and settling velocity (Vs), that influence pollen flight. The mean diam...

Journal: :Plant physiology 2015
Stephanie L Madison Matthew L Buchanan Jeremiah D Glass Tarah F McClain Eunsook Park Andreas Nebenführ

Pollen tube growth is an essential aspect of plant reproduction because it is the mechanism through which nonmotile sperm cells are delivered to ovules, thus allowing fertilization to occur. A pollen tube is a single cell that only grows at the tip, and this tip growth has been shown to depend on actin filaments. It is generally assumed that myosin-driven movements along these actin filaments a...

Journal: :Current Biology 2013
Jingjing Liu Sheng Zhong Xinyang Guo Lihong Hao Xiaolin Wei Qingpei Huang Yingnan Hou Jiao Shi Chaoyang Wang Hongya Gu Li-Jia Qu

Successful sexual reproduction in animals and plants requires communication between male and female gametes. In flowering plants, unlike in animals, eggs and sperm cells are enclosed in multicellular embryo sacs and pollen grains, respectively; guided growth of the pollen tube into the ovule is necessary for fertilization. Pollen tube guidance requires accurate perception of ovule-emitted guida...

2016
Andrea Obersteiner Stefanie Gilles Ulrike Frank Isabelle Beck Franziska Häring Dietrich Ernst Michael Rothballer Anton Hartmann Claudia Traidl-Hoffmann Michael Schmid Ulrich Melcher

Pollen allergies have been rapidly increasing over the last decades. Many allergenic proteins and non-allergenic adjuvant compounds of pollen are involved in the plant defense against environmental or microbial stress. The first aim of this study was to analyze and compare the colonizing microbes on allergenic pollen. The second aim was to investigate detectable correlations between pollen micr...

Journal: :Anais da Academia Brasileira de Ciencias 2017
Everton H Souza Fernanda V D Souza Mônica L Rossi Renan M Packer Maria Amelia V Cruz-Barros Adriana P Martinelli

Pollen morphology characterization is important in taxonomy, conservation and plant breeding, and pollen viability studies can support breeding programs. This study investigated pollen morphology and male fertility in 18 species of Bromeliaceae with ornamental potential. For morphological characterization, pollen grains were acetolyzed and characterization of exine was done using scanning and t...

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