Pollen tubes can reach great lengths, as in corn, where the corn silk consists… All rights reserved. Pollen tube definition, the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule. ; It is essential for sexual reproduction. Here we report imaging of cAMP distribution in living pollen tubes microinjected with the protein kinase A-derived fluorosensor. 255 .Within the tube, the haploid generative nucleus divides by MITOSIS to give two MALE GAMETE NUCLEI which have an important function in the … https://www.thefreedictionary.com/pollen+tube. See more. Define pollen tube by Webster's Dictionary, WordNet Lexical Database, Dictionary of Computing, Legal Dictionary, Medical Dictionary, Dream Dictionary. What does pollen tube mean? 1 answer. Definition of Pollen tube. Copyright © HarperCollins Publishers. Main Entry: pollen tube Function: noun: a tube that is formed by a pollen grain as it grows down the style and that carries the sperm nuclei to the embryo sac of a flower The pollen-tube does not penetrate the ovule through the micropyle but enters at the opposite end—the chalaza. (Botany) a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell. Ans. Pollen tube definition is - a tube that is formed by a pollen grain and conveys the sperm nuclei to the embryo sac of an angiosperm or the archegonium of a gymnosperm. Pollen tubes possessing a non-linear and quasi-sinusoidal growth rate represented as a universal biological event in different plant species reveal a general and oscillatory growth pattern, with periods of 20–90 sec and amplitudes of three- to fourfold difference between two top peaks of growth rate (Feijo et al., 2001, Parton et al., 2003). Examples of how to use “pollen tube” in a sentence from the Cambridge Dictionary Labs Noun. Information and translations of pollen tube in the most comprehensive dictionary definitions resource on the web. This pollen grain with the pollen tube and 3 nuclei is considered the mature gametophyte. Pollen tubes can reach great lengths, as in corn, where the corn silk consists… Lexicographical Neighbors of Pollen Tube We Asked, You Answered. The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms. the tube that develops from the wall of a pollen grain and, in seed plants, provides a passage through which the male nuclei reach the embryo sac to effect fertilization ¹. Q.27. The diagram of a pistil showing pollen tube growth into the ovule is as follows: Related questions 0 votes. Most people chose this as the best definition of pollen-tube: A slender tube that is fo... See the dictionary meaning, pronunciation, and sentence examples. ¹ Source: wiktionary.com. pollen tube - definition and meaning Community Pollen germination typically takes up < 8% of the duration of the progamic phase, whereas the period of pollen tube growth determines > 92% of its duration (Williams, 2012b). noun: slender tubular outgrown from a pollen grain that penetrates the ovule and releases male gametes Only one Pollen tube is produced by a Pollen Grain in general cases but in the case of some plants, they produce many Pollen tubes. 2 ) Generative nucleus == It forms TWO Male gametes or the sperms or the sperm nuclei by division. pollen tube pronunciation - How to properly say pollen tube. 1. pollen tube - (botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule. All Free. In higher plants, turgor pressure is responsible for apical growth of things such as root tips and pollen tubes. Pollen tube definition, the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule. The pollen tube of lilies can have a turgor pressure of 0-21 MPa when growing during this process. The pollen tube of most seed plants acts as a passageway. Enrich your vocabulary with the English Definition dictionary You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.. Start your free trial today and get unlimited access to America's largest dictionary, with: . Pollen grains were considered germinated when the size of their respective pollen tubes were found to be equal to, or greater than, the diameter of the pollen itself. A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Examples of how to use “pollen tube” in a sentence from the Cambridge Dictionary Labs a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell. Definitions of pollen tube: . Pollen, a mass of microspores in a seed plant, usually appearing as a fine dust and varying greatly in shape and structure. pollen tube a slender structure produced from a POLLEN GRAIN after POLLINATION.The tube protrudes from a pore in the EXINE and grows down through the stigma, style and ovary of the CARPEL, entering the ovule usually by the micropyle.See Fig. Information about pollen tube in the AudioEnglish.org dictionary, synonyms and antonyms. 255 .Within the tube, the haploid generative nucleus divides by MITOSIS to give two MALE GAMETE NUCLEI which have an important function in the … Pollen tubes are cells which elongate when pollen lands on the stigma, at the carpal tip. Definition of pollen tube in the AudioEnglish.org Dictionary. pollen tube - WordReference English dictionary, questions, discussion and forums. A hollow tube which develops from a pollen grain when deposited on the stigma of a flower. Meaning of pollen tube. Pollen tube , a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. noun. Pollen Tube Length The time for pollen germination and subsequent pollen tube extension required to reach the ovary is measured in hours for soybean and groundnut to days in tree species such as apple (Kakani et al., 2005). A growth from a pollen grain down into the flower style which allows two sperm to pass, one to the ovum within the ovule, and the other to the central cell of the ovule to produce endosperm of SEEDS. Sepal Definition. Dictionary.com Unabridged Pollen tube. The pollen tube of most seed plants acts as a passageway. In the diagram given below, show the path of a pollen tube from the pollen on the stigma into the embryo sac. Pollen tube definition: a hollow tubular outgrowth that develops from a pollen grain after pollination, grows... | Meaning, pronunciation, translations and examples pollen tube explanation. Pollen definition is - a mass of microspores in a seed plant appearing usually as a fine dust. Pollen tube elongation is an integral stage in the plant life cycle. ‘Guidance of the pollen tube down the style involves mechanical, chemical and physical cues … Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition pollen tube in British English. pollen tube a slender structure produced from a POLLEN GRAIN after POLLINATION.The tube protrudes from a pore in the EXINE and grows down through the stigma, style and ovary of the CARPEL, entering the ovule usually by the micropyle.See Fig. The Dictionary.com Word Of The Year For 2020 Is …. It penetrates the style and conveys the male gametes to the ovule. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. phytology, botany - the branch of biology that studies plants. pollen tube: A slender tube that is formed by a pollen grain of a seed plant and penetrates the ovule, where it releases the male gametes. The generative cell will release the sperm nuclei, which travel down the pollen tube to reach the female reproductive portion of the flower. pollen tube a slender structure produced from a POLLEN GRAIN after POLLINATION . This Pollen tube grows into stigma towards the ovarian cavity. The People’s Choice 2020 Word Of The Year: 2020 Was A $#@#%%$@! Search the Kids Internet . The pollen grain germinates, which allows the pollen tube to form and work its way down the style of the plant to the ovule. What Is An Em Dash And How Do You Use It? Enrich your vocabulary with the English Definition dictionary This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Describe 2020 In Just One Word? Ans. Published by Houghton Mifflin Harcourt Publishing Company. What is pollination? Other articles where Pollen tube is discussed: angiosperm: Pollination: The pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids). The pollen tube is the tube through which sperm from the pollen reaches the egg cell, and fertilises the plant to form seeds.. Definition of pollen tube in the AudioEnglish.org Dictionary. Quick definitions from WordNet (pollen tube) noun: slender tubular outgrown from a pollen grain that penetrates the ovule and releases male gametes Also see pollen_tubes Words similar to pollen tube Usage examples for pollen tube Words that often appear near pollen tube Pollen sac, a compartment of an anther containing pollen, -- usually there are four in each anther. Listen to the audio pronunciation in several English accents. In maize, this single cell can grow longer than 12 inches (30 cm) to traverse the length of the pistil. These synergids begin to degenerate immediately after pollination. pollen tube definition in English dictionary, pollen tube meaning, synonyms, see also 'Pollen',pollen analysis',pollen basket',pollen count'. What does pollen tube mean? It transports sperm cells from the pollen grain, from the stigma (in flowering plants) to the ovules at the base of the pistil. Pollen Tube (n.) 1. Pollen viability was assessed through histochemical analysis using 2% Lugol's solution and a 2,3,5-triphenyltetrazolium chloride (TTC) solution of 1%, diluted in a 50% sucrose solution. pollen tube - WordReference English dictionary, questions, discussion and forums. The pollen tube is very important to mutual recognition and acceptance of pollen grain. Copyright © 2011. Pollen tube , a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule. Definition of pollen tube..... Get the answers you need, now! Dictionary and Thesaurus Definition of Pollen tube Notice: Trying to ... Search the meaning and definition of over one hundred thousand words! The important functions of pollen tube are: It transports the sperm of the pollen into the embryo sac. pollen - the fine spores that contain male gametes and that are borne by an anther in a flowering plant spore - a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion; "a sexual spore is formed after the fusion of gametes" Why Do “Left” And “Right” Mean Liberal And Conservative? It is down these style-branches that the pollen-tube passes on its way to the ovules or embryo seeds. In angiosperms, pollen is produced by the anthers at the end of stamens in flowers. a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell. Pollen tubes deliver sperm after navigation through flower tissue in response to __ and ___ cues 2.genetic analyses have shown that female ___ and surrounding diploid tissues are essential for guiding pollen tubes to ovules. The male-cells are carried to their destination in the tip of the pollen-tube. As this is happening, the generative nucleus will divide and produce 2 sperm nuclei. pollen tube: 1 n (botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule Type of: plant part , plant structure any part of a plant or fungus Germination only takes place after rehydration, ensuring that premature germination does not take place in the anther. ; It protects the sperm until it reaches the embryo sac. Q.28. The American Heritage® Science Dictionary It is the transfer of pollen grains from the anther of a flower to the stigma of the flower of same species. the tube that forms from a germinating pollen grain and grows toward the ovule, carrying male gametes with it. [1] Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell containing two nuclei: a tube nucleus (that produces the pollen tube) and a generative nucleus (that divides to form the two sperm cells). a powder produced by the male part of a flower that causes the female part of other flowers of the same type to produce seeds (Definition of pollen from the Cambridge Academic Content Dictionary © … All Free. Growing tubes revealed a uniform distribution of cAMP with a resting concentration of ≈100–150 nM. The pollen tube penetrates the ovule and releases the male gametes. Pollen sac, a compartment of an anther containing pollen, -- usually there are four in each anther. These synergids begin to degenerate immediately after pollination. The pollen grain germinates, which allows the pollen tube to form and work its way down the style of the plant to the ovule. The slender tube formed by the pollen grain that penetrates an ovule after pollination and releases the male gametes. The tube protrudes from a pore in the EXINE and grows down through the stigma, style and ovary of the CARPEL , entering the ovule usually by the micropyle. Definition of pollen tube in the Definitions.net dictionary. The pollen tube then passes through the style to reach the ovary and the ovule towards the female gamete / gametophyte / Ovum. Pollen Definition. More than 250,000 words that aren't in our free dictionary ; The sperm cells cannot reach the embryo sac unless aided by the pollen tube. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Pollen refers to the powdery product synthesized by seed plants responsible for the production of the male gametes of the plant (shown below).The pollen grains are termed microgameteophytes, and consist of a sporopollenin coating which serves to protect the gameteophytes as they are transported from the stamens (male) or male cone to the pistil (female) or female cone in flowering and coniferous plants, respectively. Master these essential literary terms and you’ll be talking like your English teacher in no time. “Monolith” vs. “Megalith”: What’s The Difference? New plants then can grow from the seeds. A slender tube that is formed by a pollen grain of a seed plant and penetrates the ovule, where it releases the male gametes. The pollen grains are termed microgameteophytes, and consist of a sporopollenin coating which serves to protect the gameteophytes as they are transported from the stamens (male) or male cone to the pistil (female) or … How many nuclei are present in pollen grain? All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Both of them travel through the pollen tube … Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word pollen tube. ‘Guidance of the pollen tube down the style involves mechanical, chemical and physical cues that are not yet fully understood.’ Each pollen grain contains a generative cell, which divides into two nuclei (one of which fertilizes the egg), and a tube cell, which grows into a pollen tube to conduct the generative cell or the nuclei into the ovule. One entry found for pollen tube. The pollen tube is the tube through which sperm from the pollen reaches the egg cell, and fertilises the plant to form seeds. Once the pollen grain … The slender tube that is formed after pollination by division of the tube cell in a pollen grain. A grain of pollen is so tiny that it is best viewed through a microscope. What is a pollen tube? The branches of the stigma are very thin, formed apparently of three rows of cells of hardly greater diameter than pollen-tube. Pollen tube growth and reorientation is a prerequisite for fertilization and seed formation. Name the components of egg apparatus. Information about pollen tube in the AudioEnglish.org dictionary, synonyms and antonyms. When the polle… For instance, the subtilisin-like protease encoded by IDG002 was related to anther dehiscence [60]; the products of IDG008 were related to, A subset of the hand-pollinated flowers (ten self-pollinated and ten cross-pollinated) were collected 24 h after pollination and observed under an epifluorescence microscope to observe, Transformation of BcBCP1 gene into maize by three different, Response of in vitro pollen germination and, At the time of boll formation application of recommended dose of Boron must be applied at it improves the, Pollen was considered to have germinated if the, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Comparative Biology of Cycad Pollen, Seed and Tissue--A Plant Conservation Perspective, Identification of Wheat Inflorescence Development-Related Genes Using a Comparative Transcriptomics Approach, Reproductive biology of endemic Solanum melissarum Bohs (Solanaceae) and updating of its current geographic distribution as the basis for its conservation in the Brazilian Cerrado/Biologia reprodutiva da endemica Solanum melissarum Bohs (Solanaceae) e atualizacao da distribuicao geografica atual, como base para a sua conservacao no Cerrado Brasileiro, Development of Plant Expression Vector with Taq DNA Polymerase Gene to Yield Heat-tolerant Maize Lines, Yield in almond is related more to the abundance of flowers than the relative number of flowers that set fruit, In vitro pollen viability of maize cultivars at different times of collection/ Viabilidade in vitro de polen de cultivares de milho em diferentes tempos de coleta, Relationship between Flower Opening in Six Cotton Cultivars and Their Progeny to Pollen Dehydration Tolerance, Method for overcoming the passion fruit self-incompatibility/Metodo para superacao da autoincompatibilidade do maracujazeiro, MANAGEMENT PRACTICE BOOST UP YIELD OF COTTON, IMPROVEMENT OF THE POLLEN QUALITY AND GERMINATION LEVELS IN GRAPES (VITIS VINIFERA L.) BY LEAF PULVERIZATIONS WITH NANOSIZE CALCITE AND SEAWEED EXTRACT (ASCOPHYLLIUM NODOSUM). Both flowering plants and conifers (plants that grow seeds inside cones) make pollen. The pollen grain is severely dehydrated so that its mass is reduced enabling it to be more easily transported from flower to flower. Can you identify the antonym of “protagonist,” or the opposite of a hero or heroine? Pollen itself is not the male gamete. pollen tube: 1 n (botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule Type of: plant part , plant structure any part of a plant or fungus “Affect” vs. “Effect”: Use The Correct Word Every Time. Pollen is a powdery substance consisting of pollen grains which are male microgametophytes of seed plants, which produce male gametes (sperm cells). Pollen-tube definitions A slender tube that is formed by a pollen grain of a seed plant and penetrates the ovule, where it releases the male gametes. a tube that grows when pollen lands on the stigma (= a part of the female organ) of a flower to carry the male cell to the ovule (= the part that contains the female cell) See pollen tube in the Oxford Advanced American Dictionary Check pronunciation: pollen tube Meaning of pollen tube. The latter ultimately divides in the apex of the pollen-tube into two non-motile generative cells. Search for "pollen tube" in: Student Thesaurus; Rhyming Dictionary; Browse words next to "pollen tube." Other articles where Pollen tube is discussed: angiosperm: Pollination: The pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids). Pollen is the substance that causes plants to form seeds . Pollen refers to the powdery product synthesized by seed plants responsible for the production of the male gametes of the plant (shown below).. A pollen tube is part of the male gametophyte of seed plants. When the pollen grain germinates, the intine grows out into a tube called pollen tube. Pollen tube contains a vegetative nucleus and two male gametes. Pollen germination has three stages; hydration, activation and pollen tube emergence. Definition of pollen-tube noun in Oxford Advanced Learner's Dictionary. Definition of pollen tube Categorized under "General" Definition as written by Wingnut: A small tube that forms on the wall of a grain of pollen that provides a passageway for the male genetic material to pass from the pollen to the ovule in order to fertilize it and form a seed. A hollow tube which develops from a pollen grain when deposited on the stigma of a flower. Each pollen grain is formed in the male structures of seed-bearing plants and is transported by various means to the female structures to facilitate fertilization of the ovules. It acts as a conduit to transport the male gamete cells from the pollen grain, either from the stigma to the ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms. Love words? Pollen grains have a hard coat made of sporopollenin that protects the gametophytes during the process of their movement from the stamens to the pistil of flowering plants, or from the male cone to the female cone of coniferous plants. Pollen plate definition is - pollen basket. Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word pollen tube. Pollen Tube Length The time for pollen germination and subsequent pollen tube extension required to reach the ovary is measured in hours for soybean and groundnut to days in tree species such as apple (Kakani et al., 2005). plant part, plant structure - any part of a plant or fungus. 1. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4, Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7, Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1. See more. Collins English Dictionary. Once the pollen lands on the stigma, a series of chemical reactions takes place allowing the pollen grain to begin producing a structure called the pollen tube. Kids.Net.Au - Dictionary > Definition: pollen tube . What does pollen tube mean? the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule. Ans. The sepal is a leaf-shaped structure found in flowering plants, or angiosperms.It is found on the outermost part of the flower, and like a petal, a sepal is considered to be a modified leaf.However, sepals are more likely to be confused with leaves since they are … It penetrates the style and conveys the male gametes to the ovule. Looking for definition of pollen tube? Meaning of pollen tube. A protagonist is the main character of a story, or the lead. pollen tube definition in English dictionary, pollen tube meaning, synonyms, see also 'Pollen',pollen analysis',pollen basket',pollen count'. Growth into the embryo sac unless aided definition of pollen tube the pollen tube emergence it! Learner 's dictionary seeds inside cones ) make pollen is … AudioEnglish.org dictionary, dictionary. 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