| 单词 | sporophyte |
| 例句 | After taking the class — the Davises hold it on the last Saturday of every month — I couldn’t walk anywhere without seeing mosses and noticing the differences in size, habit, colors and sporophytes between species. Moss is no weed. It’s a brilliant addition to the garden. 2019-01-08T05:00:00Z The mature sporophyte produces sporangia, completing the cycle. Fundamentals of Biology 2015-01-01T00:00:00Z The embryo develops inside the archegonium as the sporophyte. Concepts of Biology 2013-04-25T00:00:00Z Although all plants utilize some version of the alternation of generations, the relative size of the sporophyte and the gametophyte and the relationship between them vary greatly. Biology for AP Courses 2022-06-09T00:00:00Z The zygote develops into a new sporophyte, and the cycle begins again. Miller & Levine Biology 2018-01-01T00:00:00Z After taking the monthly class, I couldn’t walk anywhere without seeing mosses and noticing the differences in size, habit, colors and sporophytes between species. Need some stress relief? Start a moss garden | Produced by Advertising Publications 2019-01-13T05:00:00Z Meiosis of cells in the sporophyte produces 1n spores, completing the cycle. Fundamentals of Biology 2015-01-01T00:00:00Z In both seedless and seed plants, the female gametophyte provides nutrition, and in seed plants, the embryo is also protected as it develops into the new generation of sporophyte. Concepts of Biology 2013-04-25T00:00:00Z In plants such as moss, the gametophyte organism is the free-living plant, and the sporophyte is physically dependent on the gametophyte. Biology for AP Courses 2022-06-09T00:00:00Z An important trend in plant evolution is the reduction in size of the gametophyte and the increase in size of the sporophyte. Miller & Levine Biology 2018-01-01T00:00:00Z The sporophyte produces spores, which contain only a single copy of the chromosomes. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z Most plants exhibit alternation of generations, which is described as haplodiplodontic: the haploid multicellular form, known as a gametophyte, is followed in the development sequence by a multicellular diploid organism: the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z Angiosperms’ life cycles are dominated by the sporophyte stage. Concepts of Biology 2013-04-25T00:00:00Z In other plants, such as ferns, both the gametophyte and sporophyte plants are free-living; however, the sporophyte is much larger. Biology for AP Courses 2022-06-09T00:00:00Z This zygote grows into a sporophyte, capped by a sporangium. Miller & Levine Biology 2018-01-01T00:00:00Z This gametophyte plant looks completely different from the sporophyte phase: it is a small, flat, amorphous blob. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z In the multicellular Ulva, a sporophyte grows by mitosis after fertilization. Fundamentals of Biology 2015-01-01T00:00:00Z Most plants exhibit alternation of generations, which is described as haplodiplontic: the haploid multicellular form known as a gametophyte is followed in the development sequence by a multicellular diploid organism, the sporophyte. Concepts of Biology 2013-04-25T00:00:00Z In seed plants, such as magnolia trees and daisies, the gametophyte is composed of only a few cells and, in the case of the female gametophyte, is completely retained within the sporophyte. Biology for AP Courses 2022-06-09T00:00:00Z The large plants easily recognized as ferns are actually the diploid sporophyte phase of the fern life cycle. Miller & Levine Biology 2018-01-01T00:00:00Z In ferns, the sporophyte phase is dominant, but the gametophyte is still hanging in there as an independent plant. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z When the egg is fertilized, the embryo grows into a hollow tube-like structure called a sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The sporophyte is the defining characteristic of the group. Concepts of Biology 2013-04-25T00:00:00Z The diploid plant is called a sporophyte because it produces haploid spores by meiosis. Biology for AP Courses 2022-06-09T00:00:00Z Spores produced by these plants grow into thin, heart-shaped haploid gametophytes, which live independently of the sporophyte. Miller & Levine Biology 2018-01-01T00:00:00Z The sporophyte phase is completely dependent on its gametophyte for photosynthesis, and does not live as a separate plant. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z The embryo grows into a sporophyte that projects like a flower from the vase. Fundamentals of Biology 2015-01-01T00:00:00Z Accompanying the prominence of the sporophyte and the development of vascular tissue, the appearance of true leaves improved photosynthetic efficiency. Concepts of Biology 2013-04-25T00:00:00Z The zygote will undergo many rounds of mitosis and give rise to a diploid multicellular plant called a sporophyte. Biology for AP Courses 2022-06-09T00:00:00Z The diploid zygote produced by fertilization develops into a new sporophyte plant, and the cycle begins again. Miller & Levine Biology 2018-01-01T00:00:00Z Does this mean that the sporophyte phase of the earliest land plants was equally dependent on its gametophyte? Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z In seedless vascular plants, the diploid sporophyte is the dominant phase of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z In seedless vascular plants, the sporophyte became the dominant phase of the lifecycle. Concepts of Biology 2013-04-25T00:00:00Z Specialized cells of the sporophyte will undergo meiosis and produce haploid spores. Biology for AP Courses 2022-06-09T00:00:00Z In seed plants, male and female gametophytes grow and mature directly within the sporophyte inside cones or flowers. Miller & Levine Biology 2018-01-01T00:00:00Z But — and this can’t be underlined enough — this thing that looked like a gametophyte but sprouted from a mutant sporophyte was diploid. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z The diploid sporophyte is the most conspicuous stage of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z At the same time, the trend led to a reduction in the size of the gametophyte, from a conspicuous structure to a microscopic cluster of cells enclosed in the tissues of the sporophyte. Concepts of Biology 2013-04-25T00:00:00Z Only tread here if you aren’t intimidated by such terms as “sporophyte” or “conductive tissue”. Mosses With a Real Inferiority Complex 2013-02-09T01:15:03.137Z It is the sporophyte that is small and easily overlooked. Ferns, Secret Ninja Ferns, and their Alluring Asexual Bits 2012-05-07T11:15:00.827Z The sporophyte — the diploid organism — is birthed in a special flask-shaped female structure after an inept moss sperm blunders inside. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z After fertilization, the zygote matures and grows into a sporophyte, which in turn will form sporangia or “spore vessels.” Fundamentals of Biology 2015-01-01T00:00:00Z Pollen can travel far from the sporophyte that bore it, spreading the plant’s genes and avoiding competition with other plants. Concepts of Biology 2013-04-25T00:00:00Z There is thus in all the Basidiales an alternation of generations, obscured, however, by the apogamous transition from the gametophyte to sporophyte. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z But their existence also means that the sporophytes need a way of making little gametophytes. Ferns, Secret Ninja Ferns, and their Alluring Asexual Bits 2012-05-07T11:15:00.827Z Every other plant that you are likely to see is a sporophyte. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z Pollen grains can travel far from their original sporophyte, spreading the plant’s genes. Fundamentals of Biology 2015-01-01T00:00:00Z The classification is at present based largely upon the characters of the sporophyte, the sexual plants being still very imperfectly known in many forms. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The matter is complicated by the apogamous transition from gametophyte to sporophyte in the absence of the ascogonium; also by the fact that there are normally two fusions in the life-history as mentioned earlier. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Thus in Pellia the nuclei of the gametophyte have eight chromosomes and those of the sporophyte sixteen. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" When the scientists cultured these stunted but sprouty sporophytes to see what would happen, the filaments grew into a mass resembling a protonema after a week. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z Plants have two distinct stages in their lifecycle: the gametophyte stage and the sporophyte stage. Fundamentals of Biology 2015-01-01T00:00:00Z The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 The sporophyte may be considered to begin at the stage of nuclear association and end with the nuclear reduction in the basidium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z In all plants higher than the Bryophyta the sporophyte becomes an independently rooted plant and is the conspicuous stage in the life-history. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The ripped-off piece of its birthplace often remains stuck to the top of the sporophyte and is called a calyptra. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z Fusion of the male and females gametes forms the diploid zygote, which develops into the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The newly formed zygote grows into a sporophyte that emerges from the gametophyte and grows by mitosis into the next generation sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The ordinary mycelium is the gametophyte since it bears the ascogonia and antheridia when present; the ascogenous hyphae with their asci represent the sporophyte since they are derived from the fertilized ascogonium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The independent origin of this conducting system is of great interest for comparison with the vascular system of the sporophyte of the higher plants. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The sporophyte is embedded in and often nourished by its parent. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z After reaching maturity, the diploid sporophyte produces spores by meiosis, which in turn divide by mitosis to produce the haploid gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The photo shows a young sporophyte with a fan-shaped leaf growing from a lettuce-like gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The dominant stage of the lifecycle of a fern is the sporophyte, which consists of large compound leaves called fronds. Fundamentals of Biology 2015-01-01T00:00:00Z The gametophytes of seed plants shrank, while the sporophytes became prominent structures and the diploid stage became the longest phase of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z Some seeds are enveloped by sporophyte tissues upon maturation. Fundamentals of Biology 2015-01-01T00:00:00Z In ferns, the gametophyte is free-living and very distinct in structure from the diploid sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The layer of sporophyte tissue that surrounds the megasporangium, and later, the embryo, is called the integument. Fundamentals of Biology 2015-01-01T00:00:00Z The life cycle of a gymnosperm involves alternation of generations, with a dominant sporophyte in which the female gametophyte resides, and reduced gametophytes. Fundamentals of Biology 2015-01-01T00:00:00Z A new diploid sporophyte is formed when a male gamete from a pollen grain enters the ovule sac and fertilizes this egg. Fundamentals of Biology 2015-01-01T00:00:00Z Both the gametophyte and sporophyte stages are multicellular. Fundamentals of Biology 2015-01-01T00:00:00Z For example, stomata are present on the stems of the sporophyte, and a primitive vascular system runs up the sporophyte’s stalk. Fundamentals of Biology 2015-01-01T00:00:00Z In both seedless and seed plants, the female gametophyte provides protection and nutrients to the embryo as it develops into the new generation of sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The cycle starts with the release of haploid spores from the sporangium that developed on the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote grows into a small sporophyte still attached to the parent gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The sporophytes are a cluster of slender green stalks with brown tips grows from this wrinkled mass. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote, protected by the archegonium, divides and grows into a sporophyte, still attached by its foot to the gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z Stomata appear in the hornworts and are abundant on the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote develops into a long and slender sporophyte that eventually splits open, releasing spores. Fundamentals of Biology 2015-01-01T00:00:00Z Lycophytes follow the pattern of alternation of generations seen in the bryophytes, except that the sporophyte is the major stage of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z In club mosses, the sporophyte gives rise to sporophylls arranged in strobili, cone-like structures that give the class its name. Fundamentals of Biology 2015-01-01T00:00:00Z Accompanying the prominence of the sporophyte and the development of vascular tissue, the appearance of true leaves improved their photosynthetic efficiency. Fundamentals of Biology 2015-01-01T00:00:00Z The seed that is formed contains three generations of tissues: the seed coat that originates from the sporophyte tissue, the gametophyte that will provide nutrients, and the embryo itself. Fundamentals of Biology 2015-01-01T00:00:00Z The narrow, pipe-like sporophyte is the defining characteristic of the group, and gives the group its name. Fundamentals of Biology 2015-01-01T00:00:00Z The diploid sporophyte of angiosperms and gymnosperms is the conspicuous and long-lived stage of the life cycle. Fundamentals of Biology 2015-01-01T00:00:00Z The sporophytes differentiate specialized reproductive structures called sporangia, which are dedicated to the production of spores. Fundamentals of Biology 2015-01-01T00:00:00Z The sporophyte is diploid and the gametophyte is haploid. Fundamentals of Biology 2015-01-01T00:00:00Z The life cycle of higher plants is dominated by the sporophyte stage, with the gametophyte borne on the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z In bryophytes, such as mosses, the haploid gametophyte is more developed than the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The seed is covered by a seed coat, which is derived from the female sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z |
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