Results 81 to 90 of about 731 (213)

Messenger RNas : their utilization and degradation during pollen germination and tube growth

Acta Societatis Botanicorum Poloniae, 2014
During pollen germination and tube growth at least 230 new proteins are synthesized, as determined by 35S-methionime labeling and two dimensional gel electrophoretic analysis of the labeled proteins.
Joseph P. Mascarenhas, Joann Mermelstein
doaj   +1 more source

Pollinator community composition and pollen resource use in calcareous grasslands under different landscape contexts across Europe

Journal of Animal Ecology, EarlyView.
In this paper, we show that pronounced differences in pollinator communities exist between grasslands embedded in contrasting agricultural landscape contexts. Opportunistic foraging strategies of most pollinators resulted in large interaction turnover, but these shifts did not translate into major changes in overall network structure, most likely as a ...
Olivia Bernhardsson, Epp Valdaru, Tsipe Aavik, Lucie M. Baltz, Tomáš Dostálek, L. Marie Ende, Khalil Jegham, Marianne Kivastik, Zuzana Münzbergová, Hana Pánková, Jan Plue, Patrycja Pluta, Iris Reinula, Virve Sõber, Panagiotis Theodorou, Sabrina Träger, Mari‐Liis Viljur, Hans Jacquemyn   +17 more
wiley   +1 more source

Brood parasitism reduces but does not prevent Bombus terrestris reproductive success

Insect Science, EarlyView.
Graphical depiction of the colony splitting process. Throughout figures in this paper, results pertaining to host success are represented in blue, and cuckoo success is represented in red. Abstract Cuckoo bumblebees are obligate brood parasites that must invade a colony of their host bumblebee species in order to reproduce.
Sofia Dartnell, Lynn V. Dicks
wiley   +1 more source

Badania biologii pyłku wytwarzanego przez kwiaty wiśni zakwitajace w różnych fazach kwitnienia [Studies of the biology of pollen formed by sour cherry flowers flowering in different stages of the blooming period]

Acta Agrobotanica, 2015
During four years (1971-1974), five sour cherry cultivars were examined for the pollen viability, germination and pollen tube growth. Pollen which was taken from the earliest and the last blooming stages had the smaller viability, germination and the ...
Stanisław Wociór
doaj   +1 more source

LINC-complex mediated positioning of the vegetative nucleus is involved in calcium and ROS signaling in Arabidopsis pollen tubes

Nucleus, 2020
Nuclear movement and positioning play a role in developmental processes throughout life. Nuclear movement and positioning are mediated primarily by linker of nucleoskeleton and cytoskeleton (LINC) complexes.
Morgan Moser, Andrew Kirkpatrick, Norman Reid Groves, Iris Meier   +3 more
doaj   +1 more source

Ants contribute to raspberry pollination in protected cropping systems

Agricultural and Forest Entomology, EarlyView.
Ants visited raspberry flowers more frequently than European honey bees (Apis mellifera), Australian stingless bees (Tetragonula carbonaria) and flies, many transporting raspberry pollen on their bodies, indicating potential pollination capacity. Ants were active flower visitors at most times of the day and may extend the daily pollination window and ...
Pia Malm, Blake M. Dawson, Jelena Preradovic, Johan Ekroos, Romina Rader, Bar Shermeister, Lena A. Schmidt   +6 more
wiley   +1 more source

EFFECT OF DIFFERENT FACTORS ON GERMINATION AND TUBE GROWTH OF Solanum sisymbrifolium LAM. POLLEN

Annals of Tropical Research, 1988
Both germination and tube growth of Solanum sisymbrifolium Lam. pollen require an optimum temperature of 25°C and a growth medium containing 100 ppm boric acid, 10% sucrose and 0.6% Bacto-agar. Pollen germination was stimulated by 5 and 10 ppm GA3, 1-10
K.M. Kuruvilla, Y.S. Chauhan , G. Das, J.S. Kharbteng   +3 more
doaj  

Molecular Mechanisms of Pollen Tube Growth and Differentiation [PDF]

The Plant Cell, 1993
' The extremely reduced, three-celled, haploid male plant (male gametophyte) of flowering plants has a number of specialized functions to perform. The primary functions are the production of two sperm cells and their transport within the pollen tube through the tissues of the style and ovary into the embryo sac in the ovule, where they participate in ...
openaire   +2 more sources

Colony‐level pollen collection reflects visitation of managed bumble bees (Bombus impatiens) in strawberry fields and surrounding landscapes without reducing pollen limitation

Agricultural and Forest Entomology, EarlyView.
We extracted pollen from colony beeswax to quantify season‐long, colony‐level resource use and tested how managed Bombus impatiens visitation and Rosaceae pollen collection relate to landscape context and strawberry pollination. Increased managed bumble bee visitation was not influenced by surrounding landcover, did not reduce pollen limitation and ...
Leeah I. Richardson, Olivia Miller, David Sossa, Aaron Iverson, Scott McArt, Katja Poveda, Heather Grab   +6 more
wiley   +1 more source

The effect of intracellular calcium level regulators on the synthesis of pollen tube callose in Oenothera biennis L.

Acta Societatis Botanicorum Poloniae, 2014
It is shown that callose synthesis in the Oenothera biennis pollen tube is regulated by the endogenous Ca2+ level. Calcium antagonists reduced the amount of callose in the wall above the tip of the pollen tube (Verapamil - calcium channels blocker) and ...
Elżbieta Bednarska
doaj   +1 more source