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Topics related to "Gymnosperm"

Gymnosperms
Gymnosperms Gymnosperms are a group of plants that share one common characteristic: they bear seeds, but their seeds do not develop within an ovary. For this reason, gymnosperms were long thought to be an evolutionary precursor to the angiosperms, which are seed plants that enclose their seeds in a... Read more
conifer
conifer [Lat.,=cone-bearing], tree or shrub of the order Coniferales, e.g., the pine , monkey-puzzle tree , cypress , and sequoia . Most conifers bear cones and most are evergreens, though a few, such as the larch , are deciduous. Conifers are widely distributed over the world but are mostly... Read more
cotyledon
cotyledon , in botany, a leaf of the embryo of a seed . The embryos of flowering plants, or angiosperms , usually have either one cotyledon (the monocots) or two (the dicots). Seeds of gymnosperms, such as pines, may have numerous cotyledons. In some seeds the cotyledons are flat and leaflike; in ... Read more
vascular bundle
vascular bundle in botany, a strand of conducting tissue extending lengthwise through the stems and roots of higher plants, including the ferns, fern allies, gymnosperms, and angiosperms. The vascular bundle consists of xylem, which conducts water and dissolved mineral substances from the soil to t... Read more
Pinophyta
Pinophyta , division of the plant kingdom consisting of those organisms commonly called gymnosperms. The gymnosperms, a group that includes the pine, have stems, roots and leaves, and vascular, or conducting, tissue (xylem and phloem). In these plants the ovules, or young seeds, are exposed to the a... Read more
angiosperm
angiosperm , term denoting seed plants in which the ovules, or young seeds, are enclosed within the ovary (that part of the pistil specialized for seed production), in contrast to the gymnosperms, in which the seeds are not enclosed within an ovary. The angiosperms constitute the division Magnoliop... Read more
Robert Brown
Robert Brown 1773-1858, Scottish botanist and botanical explorer. In 1801 he went as a naturalist on one of Matthew Flinders's expeditions to Australia, returning (1805) to England with valuable collections. In his Prodromus florae Novae Hollandiae et Insulae Van Diemen (1810) he described Austra... Read more
cone
cone or strobilus , in botany, reproductive organ of the gymnosperms (the conifers , cycads , and ginkgoes ). Like the flower in the angiosperms (flowering plants), the cone is actually a highly modified branch; unlike the flower, it does not have sepals or petals. Usually separate male (stam... Read more
cycad
cycad , any plant of the order Cycadales, tropical and subtropical palmlike evergreens. The cycads, ginkgoes , and conifers comprise the three major orders of gymnosperms, or cone-bearing plants (see cone and plant ). The cycads first appeared in the Permian period. They are the most primitive... Read more
ginkgo
ginkgo or maidenhair tree, tall, slender, picturesque deciduous tree ( Ginkgo biloba ) with fan-shaped leaves. The ginkgo is native to E China, where it was revered by Buddhist monks and planted near temples. A "living fossil," the ginkgo is the only remaining species of a large order (Gink... Read more

Encyclopedia entries related to "Gymnosperm"

Gymnosperm
Encyclopedia entry from: The Gale Encyclopedia of Science Gymnosperm Gymnosperms are one of the two major groups of plants that produce seeds; the other is the angio-sperms. Gymnosperm literally means “ naked seed, ” which refers to the development of seeds exposed on a flat structure...
gymnosperm
Book article from: The Columbia Encyclopedia, Sixth Edition gymnosperm see angiosperm .
Angiosperm
Encyclopedia entry from: The Gale Encyclopedia of Science ...such as growth and greater seed production. Therefore, the flower and its ovary have provided angiosperms with tremendous advantages, and have enabled them to become rapidly dominant over their gymnosperm ancestors. Les C. Cwynar
Conifer
Encyclopedia entry from: The Gale Encyclopedia of Science ...which also include the cycads (tropical plants with palmlike leaves) and a group consisting of four plants having both gymnosperm and angiosperm features. Male and female cones grow separately on the same tree. The female cones are larger and grow on...
Ginkgo
Encyclopedia entry from: The Gale Encyclopedia of Science Ginkgo The ginkgo, or maidenhair tree ( Ginkgo biloba ) is an unusual species of gymnosperm, having broad leaves, and seasonally deciduous foliage that turns yellow and is dropped in autumn. The ginkgo is a dioecious...
ginkgo
Book article from: World Encyclopedia ginkgo ( maidenhair tree ) Oldest living species of gymnosperm , native to temperate regions of China. It dates from the late Permian period. It has fan-shaped leaves, small, foul-smelling...
angiosperm
Book article from: World Encyclopedia angiosperm Plants with true flowers, as distinct from gymnosperm and other non-flowering plants. They include most trees, bushes, and non-woody herbs. There are two main groups: monocotyledons...
Pollination
Encyclopedia entry from: The Gale Encyclopedia of Science ...the other(s). Gametophyte — The haploid, gamete-producing generation in a plant ’ s life cycle. Gymnosperm — Plant which produces its seed naked, rather than within a mature ovary. Haploid — Nucleus or cell...
Pinophyta
Book article from: The Columbia Encyclopedia, Sixth Edition ...phloem). In these plants the ovules, or young seeds, are exposed to the air at the time of pollination, hence the term gymnosperm, meaning naked seed. Pollination is always by wind. Because the seed-bearing structures of many gymnosperms are organized...
Robert Brown
Book article from: The Columbia Encyclopedia, Sixth Edition ...British Museum. He observed Brownian movement in 1827, discovered the cell nucleus in 1831, and was the first to recognize gymnosperm as a distinct angiosperm. His studies of several plant families and of pollen were also notable.

Dictionary entries related to "Gymnosperm"

gymnosperm
Book article from: A Dictionary of Plant Sciences gymnosperm A seed plant in which the ovules are carried naked on the cone scales, in contrast to the angiosperms , in which they are enclosed...
progressive evolution
Book article from: A Dictionary of Plant Sciences ...allowed plants and animals to become ever more independent of the aquatic environment in which they first evolved. For example, the sequence bryophyte , pteridophyte , gymnosperm , angiosperm represents a progressive evolutionary trend.
epithelium
Book article from: A Dictionary of Plant Sciences epithelium The lining of a resin canal in a gymnosperm or a gum duct in a dicotyledon. Epithelial cells often secrete resin or gum.
Brown, Robert
Book article from: A Dictionary of Plant Sciences ...but who is best known for his discovery of Brownian motion . He was the first person to distinguish between angiosperm and gymnosperm , made a particular study of sexual processes in higher plants, originated the microscopical study of fossil plants, and...
pollen
Book article from: A Dictionary of Earth Sciences ...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...
Chapman, Alvan Wentworth
Dictionary entry from: Complete Dictionary of Scientific Biography ...died in infancy. Chapman botanized on the Apalachicola River in 1837 with Hardy Bryan Croom, discoverer of the endemic gymnosperm Torreya . The manuscripts left unfinished at Croom ’ s accidental death led Chapman to redouble his botanical activities...
Ginkgophyta
Book article from: A Dictionary of Biology Ginkgophyta See gymnosperm .
companion cell
Book article from: A Dictionary of Biology ...the adjacent sieve element and to take part in loading and unloading sugar into the sieve element. In gymnosperms a similar function is attributed to albuminous cells , which are found closely associated with gymnosperm sieve elements.
Coniferophyta
Book article from: A Dictionary of Biology ...inhabiting cool temperate regions and have leaves reduced to needles or scales. The wood of conifers, which is called softwood in contrast to the hardwood of angiosperm trees, is widely used for timber and pulp. See also gymnosperm .
Cycadophyta
Book article from: A Dictionary of Biology 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...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Plant genome; biodiversity and evolution; v.1, part D: Phanerogams (Gymnosperm) and (Angiosperm-Monocotyledons).(Brief Article)(Book Review)
Magazine article from: SciTech Book News; 12/1/2007; 537 words ; 9781578084203 Plant genome; biodiversity and evolution; v.1, part D: Phanerogams (Gymnosperm) and (Angiosperm-Monocotyledons) Ed. by A.K. Sharma and Archana Sharma. Science Publishers, Inc. 2006 350 pages $95...
Functional Characterization of Nine Norway Spruce TPS Genes and Evolution of Gymnosperm Terpene Synthases of the TPS-d Subfamily1[w]
Magazine article from: Plant Physiology; 8/1/2004; ; 700+ words ; ...synthase and longifolene synthase have not been previously described, and this linalool synthase is the first described from a gymnosperm. These functionally diverse TPS account for much of the structural diversity of constitutive and methyl jasmonate-induced...
Gymnosperm Orthologues of Class B Floral Homeotic Genes and Their Impact on Understanding Flower Origin
Magazine article from: Critical Reviews in Plant Sciences; 1/1/2004; ; 700+ words ; ...stamens. So what is the function of gymnosperm B genes? Recent experiments revealed...These findings strongly suggest that gymnosperm and angiosperm B genes have highly related...flower precursors out of male or female gymnosperm reproductive cones, respectively...
SCIENTISTS FIND PLANT POLLINATION BY INSECTS OCCURRED LONG BEFORE FLOWERS EVOLVED
News Wire article from: US Fed News Service, Including US State News; 11/12/2009; 660 words ; ...relationship existed between insects and early gymnosperm species (non-flowering plants with...however, have found evidence that gymnosperm plants shared an intricate pollination...reproductive features of coexisting gymnosperm plants. The proboscis (elongated tubular...
Conifers, Angiosperm Trees, and Lianas: Growth, Whole-Plant Water and Nitrogen Use Efficiency, and Stable Isotope Composition ([delta]^sup 13^C and [delta]^sup 18^O) of Seedlings Grown in a Tropical Environment1[W][OA]
Magazine article from: Plant Physiology; 9/1/2008; ; 700+ words ; Seedlings of several species of gymnosperm trees, angiosperm trees, and angiosperm...significantly higher in angiosperm than in gymnosperm species, and was primarily controlled...tree species are able to out-compete gymnosperm tree species in tropical environments...
A biotechnology strategy for medium- and long-term conservation of cycads.
Magazine article from: The Botanical Review; 1/1/2004; ; 700+ words ; ...because the characteristic stages of gymnosperm somatic embryo development were not...demonstrated that morphogenesis followed the gymnosperm embryo development sequence: proembryo...embryogenesis from the mature phase of any gymnosperm species, thereby demonstrating the...
An aquaglyceroporin is abundantly expressed early in the development of the suspensor and the embryo proper of loblolly pine
Magazine article from: Plant Physiology; 12/1/2001; ; 700+ words ; ...suspensor region. Although angiosperm and gymnosperm embryo ontogeny share many features...endosperm characteristic of angiosperms, gymnosperm embryogenesis proceeds via a single...form the suspensor. Also common in gymnosperm embryogeny is a phenomenon called cleavage...
Complete nucleotide sequence of the Cryptomeria japonica D. Don. chloroplast genome and comparative chloroplast genomics: diversified genomic structure of coniferous species.(Research article)(Report)
Magazine article from: BMC Plant Biology; 6/23/2008; ; 700+ words ; ...genome nucleotide sequences of only three gymnosperm species, Cycas taitungensis [8...other hand, the relative sizes of the gymnosperm IRs vary significantly among taxa...phylogenetic studies, of the four extant gymnosperm groups (Cycads, Conifers, Ginkgoales...
Winter lacks green
Newspaper article from: Tribune-Review/Pittsburgh Tribune-Review; 1/4/2009; ; 700+ words ; ...woody cone rather than a closed fruit. Gymnosperm means "naked seed." We usually think...that fall in autumn. Tamarack is a gymnosperm with needle leaves like a pine, spruce...needles of the yew. Ginkgos are in the gymnosperm family, but they break all the rules...
The complete plastid genome sequence of Welwitschia mirabilis : an unusually compact plastome with accelerated divergence rates.(Research article)
Magazine article from: BMC Evolutionary Biology; 5/1/2008; ; 700+ words ; ...Welwitschiaceae) is a morphologically unique gymnosperm ("without parallel among all living...chloroplast genome sequences. This paucity of gymnosperm chloroplast genome sequences (only three gymnosperm plastomes are available, and two are...