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pollen

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absolute pollen frequency

absolute pollen frequency  

(APF)The expression of pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are known, per unit time. ...
aeropalynology

aeropalynology  

The study of pollen grains and spores in the atmosphere. This is important for allergy studies (e.g. of hay fever), for understanding the spread of diseases in man, other animals, and agricultural ...
Allerød

Allerød  

A north-west European interstadial, from c.12 000 to 10 800 years bp; in Britain not usually distinct from the Bølling. Pollen records point to a cool temperate flora, with birch. See Willard et al. ...
allogamy

allogamy  

Fertilization that involves pollen and ovules from different flowers. See also autogamy, geitonogamy, and xenogamy.
anther

anther  

The upper two-lobed part of a plant stamen, usually yellow in colour. Each lobe contains two pollen sacs within which are numerous pollen grains, which are released when the anther ruptures.
antherozoid

antherozoid  

The motile male gamete of algae, fungi, bryophytes, clubmosses, horsetails, ferns, and certain gymnosperms. Antherozoids usually develop in an antheridium but in certain gymnosperms, such as Ginkgo ...
aperturate

aperturate  

Applied to a structure having openings (apertures), especially to a pollen grain with regions where only nexine is present or exine is lacking completely.
bee

bee  

Traditionally taken as the type of an industrious and productive worker. Bees are also the emblem of St Ambrose (see also beehive) and St John of Chancery.There are a number of superstitions ...
Boreal

Boreal  

A division of the Flandrian, c.10 000–8 000 years bp.
buzz pollination

buzz pollination  

The shedding of pollen from anthers that project from the flower, due to stimulation that occurs when the rapid vibration of a bee's wings resonates with the natural frequency of the anther ...
callose

callose  

An insoluble glucan that is found in higher plants, in which glycosidic (see glycoside) linkages join the first and third carbon atoms of neighbouring beta-glucose units. Structurally it is similar ...
Clavatipollenites

Clavatipollenites  

A miospore from the Barremian (Lower Cretaceous); one of the oldest known angiosperm pollen grains. It is oval and monosulcate (see sulcus).
colpate

colpate  

Applied to a pollen grain that has 1 or more colpi (see colpus).
colpus

colpus  

(pl. colpi)A germinal groove or aperture on the surface of a pollen grain, which is elliptical or approximately rectangular in shape and at least twice as long as it is wide. The shape and ...
connective tissue

connective tissue  

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The tissue that supports, binds, or separates more specialized tissues and organs or functions as a packing tissue of the body. It consists of an amorphous ground substance of mucopolysaccharides in ...
controlled pollination

controlled pollination  

A common practice in plant hybridization of bagging the pistillate flowers to protect them from undesired pollen. When the pistillate flowers are in a receptive condition, they are dusted with pollen ...
corpus

corpus  

1 The body of a pollen grain that has bladders, or air-filled sacs (e.g. Pinus).2 In angiosperms, the cells below the tunica of the apical meristem.
cross-breeding

cross-breeding  

Usually, outbreeding or the breeding of genetically unrelated individuals. In animals it refers to the mating of individuals that are not consanguineous (see consanguinity).
cross-pollination

cross-pollination  

The transfer of pollen from the stamen of a flower to the stigma of a flower of a different genotype but usually of the same species, with subsequent growth of the pollen tube. See also ...
Cycadophyta

Cycadophyta  

A phylum of seed plants (see gymnosperm) that contains many extinct species; the few modern representatives of the group include Cycas and Zamia. Cycads inhabit tropical and subtropical regions, ...

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