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pollen

Collectively, the mass of microspores or pollen grains produced within the anthers of a flowering plant (angiosperm) or the male cones of a gymnosperm.

Piano

Piano   Reference library

Edwin M. Ripin, Stewart Pollens, Edwin M. Ripin, Stewart Pollens, Michael Latcham, Philip R. Belt, Maribel Meisel, Alfons Huber, Michael Cole, Philip R. Belt, Maribel Meisel, Gert Hecher, Anne Beetem Acker, Michael Cole, Beryl Kenyon de Pascual, Michael Latcham, Cynthia Adams Hoover, Cyril Ehrlich, Edwin M. Good, Cyril Ehrlich, Edwin M. Good, Anne Beetem Acker, Robert Winter, Robert Winter, Anne Beetem Acker, and J. Bradford Robinson

The Grove Dictionary of Musical Instruments (2 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Music
Length:
25,722 words
Illustration(s):
19

...1750–1900 (Oxford, 1999) S. Soderlund : How Did They Play? How Did They Teach? A History of Keyboard Technique (Chapel Hill, NC, 2006) M. Moran , D. Taubman : Basic Alignment and Rotation (New York, 2008) Edwin M. Ripin / Stewart Pollens /R (I(1)); Edwin M. Ripin / Stewart Pollens / Michael Latcham (I(2)); Philip R. Belt , Maribel Meisel / Alfons Huber /R (I(3)); Michael Cole /R (I(4)); Philip R. Belt , Maribel Meisel / Gert Hecher / Anne Beetem Acker (I(5)); Michael Cole (I(6)); Beryl Kenyon de Pascual / Michael Latcham /R...

pollen

pollen   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
33 words

... Collectively, the mass of microspores or pollen grains produced within the anthers of a flowering plant ( angiosperm ) or the male cones of a gymnosperm...

pollen

pollen   Quick reference

A Dictionary of Forensic Science

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Law
Length:
22 words

... A very fine dust produced by plants containing microspores; the male component of reproduction. The study of pollen is called...

pollen

pollen   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... Collectively, the mass of microspores (pollen grains) produced by the anthers of a flowering plant ( angiosperm ) or the male cones of a gymnosperm . Different pollen types are described according to their shapes, apertures, etc. Furrows on the surface of the pollen grain are called ‘sulci’ (sing. sulcus) and monosulcate pollen has a single sulcus. Tricolpate pollens have three, furrow-like, germinal apertures arranged 120° apart and there are many variants of this...

pollen

pollen   Reference library

Bryan Coombe

The Oxford Companion to Wine (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... , collective term for pollen grains which carry the male gametes in sexual propagation for the vines as for other plants. Pollen develops within sacs of the anther . Mature grains have a sculptured surface typical for each species. See flowering . See also vineyard ecosystem . Dr Bryan...

pollen

pollen   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
106 words

...pollen The mass of grains containing the male gametes of seed plants, which are produced in large numbers in the pollen sacs . The pollen grains of insect-pollinated plants may be spiny or pitted and are usually larger than those of wind-pollinated plants, which are usually smooth and light. The pollen grain contains the male gametophyte generation; it contains two male nuclei: a generative nucleus and a tube nucleus . The wall of the mature pollen grain consists of the tough outer wall ( exine ) and the more delicate narrower intine . The latter gives...

pollen

pollen   Quick reference

The Concise Oxford Dictionary of Archaeology (2 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
Archaeology, History
Length:
53 words

... [Ge] Fine dust‐like grains discharged from the male part of a plant with a tough outer layer called the exine surrounding the fertile gamete. Pollen grains are distinctive to species level or beyond in their shape and form and survive well for long periods. Fern spores also survive in a similar...

pollen

pollen   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
124 words

... Powder-like spores that give rise to the male sex cells in flowering plants. Pollen grains are produced in the anther chambers on the stamen . When the pollen lands on the stigma of a compatible plant, it germinates, sending a long pollen tube down through the style to the ovary . During this process, one of its nuclei divides, giving rise to two male nuclei (the equivalent of male sex cells or gametes ), one of which fuses with a female sex cell in fertilization. The other sex cell fuses with two more of the female nuclei to form a special...

pollen

pollen   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... Tiny, powdery grains derived from seed plants that contain the male reproductive cells. The pollen of each plant has a distinctive size and shape, which helps in pollen analysis...

pollen

pollen   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... Collectively, the mass of microspores or pollen grains produced within the anthers of a flowering plant or the male cones of a gymnosperm . Different pollen types are described according to their shapes, apertures, etc. Furrows on the surface of the pollen grain are called ‘colpi’ (sing. colpus ) or ‘sulci’ (sing. sulcus); the words are synonymous. Monosulcate pollen has a single colpus, tricolpate pollens have three, furrow-like colpi (sulci) arranged 120° apart, and there are many variants of this...

pollen

pollen   Quick reference

A Dictionary of Public Health (2 ed.)

Reference type:
Subject Reference
Current Version:
2018

...pollen Plant spores mainly of microscopic size carried long distances by wind. As they are plant protein, they are usually antigenic in action, and some induce severe allergies. In communities where high proportions of people experience these allergies, weather forecasts often include the pollen count during relevant seasons. ...

pollen rain

pollen rain   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
15 words

... rain The pollen grains and spores that fall on a particular...

pollen sac

pollen sac   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
17 words

... sac The structure within which pollen grains are formed in angiosperms and gymnosperms...

pollen tube

pollen tube   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
22 words

... tube the tube formed from a germinating pollen grain that carries male gametes to the ovum. See Appendix C , 1830,...

bee pollen

bee pollen   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007

...pollen A mixture of bee saliva, plant pollen, and nectar. Bee pollen is taken by some athletes as an ergogenic aid , but claims that it increases energy levels and boosts performance have not been supported by scientific evidence. Honey bee-collected pollen contains bioflavinoids, such as rutin and quercetin. Bee pollen can cause allergic reactions in some...

pollen sac

pollen sac   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
51 words

...pollen sac The structure in seed plants in which pollen is produced. In angiosperms there are usually four pollen sacs in each anther ; they contain the microspore mother cells (microsporophytes). In gymnosperms variable numbers of pollen sacs are borne on the microsporophylls that make up the male cone...

pollen tube

pollen tube   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
130 words

...pollen tube An outgrowth of a pollen grain, which transports the male gametes to the ovule. It will only grow if the pollen grain is compatible with the female tissue. In angiosperms, the pollen grain is deposited on the stigma and the pollen tube grows down through the style and into the ovule. Germination of the pollen grain is initiated by imbibition of water from the stigma. Development of the pollen tube through the tissue of the style is guided by signal molecules secreted by the synergids in the embryo sac. In some conifers, e.g. Pinus (pines), the...

pollen core

pollen core   Quick reference

The Concise Oxford Dictionary of Archaeology (2 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
Archaeology, History
Length:
29 words

... core [De] A column of soil or peat extracted from the ground containing a continuous record of pollen grains representative of changing vegetation over a period of...

bee pollen

bee pollen   Quick reference

Food and Fitness: A Dictionary of Diet and Exercise (2 ed.)

Reference type:
Subject Reference
Current Version:
2016

...pollen Bee pollen is a mixture of bee saliva, plant pollen, and nectar. Some people take it in the belief that it has special health-enhancing properties, others take it because they think it acts as an ergogenic aid (performance booster). It has been claimed that bee pollen improves oxygen uptake and helps to accelerate recovery in training. There is no scientific evidence to support claims that bee pollen improves health or physical performance. On the contrary, it may contain allergy-inducing substances that are dangerous to hypersensitive...

pollen grain

pollen grain   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
57 words

... grain a microspore in flowering plants that germinates to form the male gametophyte (pollen grain plus pollen tube), which contains three haploid nuclei. One of these fertilizes the ovum, a second fuses with the two polar nuclei to form the 3N endosperm, and the third (the vegetative nucleus) degenerates once double fertilization ( q.v. ) has been...

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