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Topic: Cotyledon


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In the News (Sat 12 Apr 14)

  
  cotyledon - Encyclopedia.com
cotyledon, in botany, a leaf of the embryo of a seed.
In some seeds the cotyledons are flat and leaflike; in others, such as the bean, the cotyledons store the seed's food reserve for germination and are fleshy.
Adventitious bud regeneration from leaf and cotyledon explants of Chinese hawthorn (Crataegus pinnatifida Bge.
www.encyclopedia.com /doc/1E1-cotyledo.html   (1131 words)

  
 Highbeam Encyclopedia - Search Results for Cotyledon
In botany, the resting stage of certain seed plant s, particularly perennial monocotyledons (cotyledon), consisting of a relatively large, usually globe-shaped, underground bud with membranous or fleshy overlapping leaves arising from a short stem.
Sedges are monocots (cotyledon) of extraordinary ecological importance; forming the base of food webs, they provide food and shelter for...
A Dictionary of Plant Sciences; 1/1/1998; MICHAEL ALLABY; 32 words; cotyledon A seed leaf that is borne on a plant embryo.
www.encyclopedia.com /SearchResults.aspx?Q=Cotyledon   (1357 words)

  
 Daylily Dictionary: Cotyledon
Flowering plants, called angiosperms, have embryos within their seeds that form one or two cotyledons, also often referred to as "seed leaves".
Those with one cotyledon are known as monocotyledons or monocots.
When seeds germinate, the cotyledon/s may remain below the soil surface (known as "hypogeous" germination), or emerge above it (known as "epigeous" germination), depending on the type of plant.
www.daylilies.org /ahs_dictionary/cotyledon.html   (234 words)

  
  cotyledon
Structure in the embryo of a seed plant that may form a ‘leaf’; after germination and is commonly known as a seed leaf.
The number of cotyledons present in an embryo is an important character in the classification of flowering plants (angiosperms).
In seeds that also contain endosperm (nutritive tissue), the cotyledons are thin, but where they are the primary food-storing tissue, as in peas and beans, they may be quite large.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0006930.html   (299 words)

  
  Plants Belonging to the Genus 'Cotyledon'
Cotyledon attenuata synonym of Dudleya attenuata (Orcutt's Liveforever, Tapertip Liveforever)
Cotyledon peacockii synonym of Echeveria peacockii (Peacock Echeveria)
Cotyledon pumila synonym of Echeveria pumila (Hen And Chicks)
www.desert-tropicals.com /Plants/Crassulaceae/Cotyledon.html   (298 words)

  
  Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Gymnosperm seedlings also have cotyledons, and these are often variable in number (multicotyledonous), with from 2 to 24 cotyledons forming a whorl at the top of the hypocotyl (the embryonic stem) surrounding the plumule.
Cotyledons may be either epigeal, expanding on the germination of the seed, throwing off the seed shell and become photosynthetic above the ground; or hypogeal, not expanding, remaining below ground and not becoming photosynthetic.
The latter is typically the case where the cotyledons act as a storage organ, as in many nuts and acorns.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=cotyledon   (362 words)

  
  Cotyledon   (Site not responding. Last check: )
A cotyledon is a significant part of the embryo within the seed of a plant.
The cotyledon of grasses and many other monocotyledons is highly modified, and composed of a scutellum and a coleoptile.
The cotyledons contain (or in the case of gymnosperms and monocotyledons, have access to) the stored food reserves of the seed.
www.xasa.com /wiki/en/wikipedia/c/co/cotyledon.html   (268 words)

  
 cotyledon - What is definition of the term - cotyledon ?   (Site not responding. Last check: )
A cotyledon (Greek: κωτυλυδών) is a significant part of the embryo within the seed of a plant.
Upon germination, the cotyledon usually becomes the embryonic first leaves of a seedling.
The number of cotyledons present is one characteristic used by botanists to classify the flowering plants (angiosperms).
www.linguasphere.org /dictionary/n-17814-cotyledon.html   (245 words)

  
 Cotyledon cells of Vigna mungo seedlings use at least two distinct autophagic machineries for degradation of starch ...
Cotyledon cells of Vigna mungo seedlings use at least two distinct autophagic machineries for degradation of starch granules and cellular components -- Toyooka et al.
In the detached cotyledons, expressions of SH-EP and
In the course of the ultrastructural observation of the cotyledon
www.jcb.org /cgi/content/full/154/5/973   (5152 words)

  
 Cotyledon orbiculata
Cotyledon orbiculata is widespread throughout South Africa, but is usually confined to rocky outcrops in grassland fynbos and karoo regions.
The genus name Cotyledon comes from the Greek word kotyledon that means cup-shaped hollow, this refers to the leaves of some species.
Cotyledon orbiculata is an ideal plant for the rockery, but also grows well as a pot plant placed on a veranda (stoep).
www.plantzafrica.com /plantcd/cotyledorbic.htm   (672 words)

  
 PLANTS Profile for Cotyledon orbiculata var. oblongata (pig's ear) | USDA PLANTS
See available county distributions by clicking on the states below or on the map.
View 18 genera in Crassulaceae, 2 species in Cotyledon, 1 varieties in Cotyledon orbiculata L. Classification:
Click on a scientific name below to expand it in the PLANTS Classification Report.
www.plants.usda.gov /java/profile?symbol=COORO   (86 words)

  
 cotyledon - Definitions from Dictionary.com
A leaf of the embryo of a seed-bearing plant.
Cotyledons either store food for the growing embryo (as in monocotyledons) or absorb food that has been stored in the endosperm (as in other angiosperms) for eventual distribution to the growing parts of the embryo.
One of the lobules constituting the uterine side of the placenta, consisting mainly of a rounded mass of villi.
dictionary.reference.com /browse/cotyledon   (284 words)

  
 Corn, Soybean, Wheat, and Alfalfa Field Guide   (Site not responding. Last check: )
Cotyledon: oval to spatulate with grooved petioles, and purple undersides.
Cotyledon: round to square, no hair, petiole longer and more vertical than deadnettle, a white point at tip, cotyledon lobes at petiole usually do not touch each other creating a square at the petiole.
As a seedling the cotyledons are linear to oblong and hairless.
ohioline.osu.edu /b827/0007.html   (892 words)

  
 cotyledons
For broadleaf crops, the cotyledons are used for germination and early development of the plant.
Wheat, corn and grain sorghum are grassy crops and are monocotyledons.
For grassy crops, the cotyledon is used below ground as a shield for the emerging shoot.
www.oznet.ksu.edu /fieldday/kids/crops/cotyledons.htm   (87 words)

  
 UCBG *Aloes-Big, Medium and Small *
Cotyledon, the earliest named of the three, dates from the 18 th century, when succulent plants were being introduced to the emerging world of European natural science.
Regardless of their native habitat, however, cotyledons are universally easy to grow and will respond to the same conditions.
Cotyledon orbiculata, by far the most common cotyledon in cultivation, in nature grows over much of southern Africa and takes on a bewildering number of forms.
botanicalgarden.berkeley.edu /SOM/SOM-may06.shtml   (1531 words)

  
 Cotyledon orbiculata - Crassulaceae
Cotyledon orbiculata is a succulent shrub native to South Africa.
During the winter months, the temperatures are dropped to 50° F (10°C) and watered only enough to keep the leaves from shriveling.
Cotyledon orbiculata was featured as Plant of the Week June 13-19, 2003.
www.plantoftheweek.org /week217.shtml   (308 words)

  
 KBD: Kew Bibliographic Databases: Search results
New cliff-dwelling Crassulaceae from the Eastern Cape: a new Cotyledon and two new Adromischus taxa from the Mbashe and Mzimvubu Rivers, South Africa.
Pollen morphology of Cotyledon grandiflora and Echeveria sp.
Cotyledon orbiculata - notes on the taxonomy of a variously interpreted species (abbreviated).
www.kew.org /kbd/advancedsearch.do?keywords=Cotyledon   (270 words)

  
 An expanded role for the TWN1 gene in embryogenesis: defects in cotyledon pattern and morphology in the twn1 mutant of ...
An expanded role for the TWN1 gene in embryogenesis: defects in cotyledon pattern and morphology in the twn1 mutant of Arabidopsis (Brassicaceae) -- Vernon et al.
Cotyledons from a twn1 seedling with one normal and one abnormally large cotyledon.
A separate third cotyledon is present on the opposite side of this embryo but is not entirely visible in the focal plane shown.
www.amjbot.org /cgi/content/full/88/4/570   (6230 words)

  
 Definition of cotyledon - Merriam-Webster Online Dictionary
Learn more about "cotyledon" and related topics at Britannica.com
Find more about "cotyledon" instantly with Live Search
See a map of "cotyledon" in the Visual Thesaurus
www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=cotyledon   (77 words)

  
 Induction of direct somatic embryogenesis and plant regeneration from mature cotyledon explants of Arachis hypogaea L.
Cotyledon explants (control) cultured on basal medium in the absence of any exogenous growth regulators never differentiated to produce somatic embryos, but occasionally formed roots.
Histology of somatic embryo-producing regions of cotyledons confirmed that the induction of the development process was embryogenic and not organogenic in nature.
In the present study, cotyledons were used to obtain a high frequency of somatic embryogenesis, and cotyledons from mature seeds are a convenient, accessible and efficient explant for somatic embryogenesis in groundnut.
www.ias.ac.in /currsci/jul25/articles18.htm   (2418 words)

  
 distinction-angiosperms
when the seed germinates, the cotyledon remains below ground absorbing nutrients from the endosperm which is the starchy food supply in the seed.
Dicot seeds contain 2 cotyledons, these structures absorb and store the nutrients from the endosperm before the seed germinates.
The cotyledons emerge above the ground and transports nutrients, and for a short time serve as photosynthetic leaves, but die when the true leaves emerge.
www.geocities.com /atiemajal/distinction-angiosperms.html   (179 words)

  
 Role of ethylene in cotyledon development of microspore-derived embryos of Brassica napus -- Hays et al. 51 (352): 1851 ...
At 20 DAC the excised cotyledon evolved 85% of the ethylene
The inhibition of cotyledon expansion by an ethylene biosynthesis inhibitor (AVG) and an ethylene action inhibitor (STS) is reversible at the cellular level.
Cotyledon sections shown are longitudinal median with respect to the embryo axis.
jxb.oxfordjournals.org /cgi/content/full/51/352/1851   (4353 words)

  
 Dunn Gardens - Lewisia cotyledon
Lewisia cotyledon is one variety of the genus Lewisia, which grow throughout parts of western North America.
cotyledon is native to parts of Northern California and Southern Oregon and there are many seed strains available.
cotyledon offers a wide color range in flowers, as it has been hybridized probably the most of any of the genus.
www.dunngardens.org /summer/lewisia_cotyledon.html   (121 words)

  
 Systematica - Cotyledon
Cotyledon buchholziana Schuldt and Stephan, Kakteenkunde, 111; et in Kakteenkunde, 1938, 111, descr.
Cotyledon hallii H.R. Tolken, Bothalia, 12 (2): 193, 1977
Cotyledon sikokiana Makino and Makino, Iinuma, Somoku Dzusetsu, ed.
www.lapshin.org /succulent/Cotyledon-list.htm   (205 words)

  
 Activity 6 -students
The seeds with an embryo attached to a cotyledon grew.
The embryo will grow when it is attached to a cotyledon, because the cotyledon provides the embryo with food.
One logical explanation for this is that the cotyledon is giving food to the embryo.
ed-web3.educ.msu.edu /RothK/actstu6.htm   (903 words)

  
 Cotyledon and binucleate cell nitric oxide synthase expression in an ovine model of fetal growth restriction -- Galan ...
Cotyledon and binucleate cell nitric oxide synthase expression in an ovine model of fetal growth restriction -- Galan et al.
Cotyledon and binucleate cell nitric oxide synthase expression in an ovine model of fetal growth restriction
and cotyledons from TN pregnancies, 2) cotyledons of increasing
jap.physiology.org /cgi/content/full/90/6/2420   (4495 words)

  
 The Cape Verde Islands Allele of Cryptochrome 2 Enhances Cotyledon Unfolding in the Absence of Blue Light in ...
Mapping was based either on absolute values of hypocotyl length and cotyledon angle in darkness, hourly pulses of FR, hourly pulses of R, and continuous FR, or on the specific photobiological response (VLFR, LFR, and HIR).
Cotyledon angle in seedlings of Ler, NIL-EDI, CRY2-Cvi, and CRY2-Ler-367M grown under hourly pulses of FR, R, or R-FR mixtures providing a series of calculated Pfr/P (3%, 10%, 33%, 61%, and 87%).
angle between the cotyledons was measured with a protractor.
www.plantphysiol.org /cgi/content/full/133/4/1547   (5858 words)

  
 Seeds   (Site not responding. Last check: )
In the picture the roundish, yellowish thing is one of the two cotyledons -- the other cotyledon is on the other side but you can't see it.
The future cotyledons are large and waxy because food for the future emerging plant is stored within them.
Now that you have at least a little feeling for the remarkable diversity of fruits and seeds, you might be interested in reviewing how certain modifications help spread fruits and seeds away from the parent, to form new populations in other areas.
www.backyardnature.net /seeds.htm   (800 words)

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