Pollen tube - wikipedia Pollen tube SEM image of pollen tubes growing from Lily pollen grains. A pollen tube is part of the male gametophyte of seed plants. It acts as a conduit to transport the male gamete cells from the pollen grain, either from the stigma ( in flowering plants ) to the ovules. In maize, this single cell can grow longer than 12 inches to traverse the length of the pistil. Pollen tubes were first discovered by Giovanni Battista Amici. Contents 1 The pollen tube in Angiosperms 2 Pollen tubes used to study cell physiology 3 Pollen tube guidance 4 DNA repair 5 See also 6 References 7 External links The pollen tube in angiosperms Angiosperm life cycle. Angiosperm reproduction is a complex process that includes several steps that may vary among species. Each step is a vast procedure in its own right. Pollen is produced by the stamen, the male reproductive organ of the flower. Each pollen grain contains a vegetative cell, and a generative cell that divides to form two sperm cells. The pollen is delivered by the opening of anthers for subsequent pollination, that is, for the transfer of pollen grains to the pistil, the female reproductive organ. Pollination is usually carried out by wind, water or insects. The ovaries hold the ovules that produce the female gamete : the egg cell, which waits in place for fertilization. Once a pollen grain settles on a compatible pistil, it may germinate in response to a sugary fluid secreted by the mature stigma of certain plants. Lipids at the surface of the stigma may also stimulate pollen tube growth for compatible pollen. Plants that are self - sterile often inhibit the pollen grains from their own flowers from growing pollen tubes. The presence of multiple grains of pollen has been observed to stimulate quicker pollen tube growth in some plants. The vegetative cell then produces the pollen tube, a tubular protrusion from the pollen grain, which carries the sperm cells within its cytoplasm. The sperm cells are the male gametes that will join with the egg cell and the central cell in double fertilization. The germinated pollen tube must then drill its way through the nutrient - rich style and curl to the bottom of the ovary to reach the ovule. Once the pollen tube successfully attains an ovule, it delivers the two sperm cells with a burst. One of them fertilizes the egg cell to form an embryo, which will become the future plant. The other one fuses with both polar nuclei of the central cell to form the endosperm, which serves as the embryo 's food supply. Finally, the ovary will develop into a fruit and the ovules will develop into seeds. Pollen tubes used to study cell physiology Pollen tubes are an excellent model for the understanding of plant cell behavior. They are easily cultivated in vitro and have a very dynamic cytoskeleton that polymerizes at very high rates, providing the pollen tube with interesting mechanical properties. The pollen tube has an unusual kind of growth ; it extends exclusively at its apex. Extending the cell wall only at the tip minimizes friction between the tube and the invaded tissue. This tip growth is performed in a pulsating manner rather than in a steady fashion. Remarkably, the pollen tube 's journey through the style often results in depth - to - diameter ratios above 100 : 1 and up to 1000 : 1 in certain species. The internal machinery and the external interactions that govern the dynamics of pollen tube growth are far from being fully understood. Pollen tube guidance Extensive work has been dedicated to comprehend how the pollen tube responds to extracellular guidance signals to achieve fertilization. It is believed that pollen tubes react to a combination of chemical, electrical, and mechanical cues during its journey through the pistil. However, it is not clear how these external cues work or how they are processed internally. Moreover, sensory receptors for any external cue have not been identified yet. Nevertheless, several aspects have already been identified as central in the process of pollen tube growth. The actin filaments in the cytoskeleton, the peculiar cell wall, secretory vesicle dynamics, and the flux of ions, to name a few, are some of the fundamental features readily identified as crucial, but whose role has not yet been completely elucidated. DNA repair During pollen tube growth, DNA damages that arise need to be repaired in order for the male genomic information to be transmitted intact to the next generation. In the plant Cyrtanthus mackenii, bicellular mature pollen contains a generative cell and a vegetative cell. Sperm cells are derived by mitosis of the generative cell during pollen tube elongation. The vegetative cell is responsible for pollen tube development. Double - strand breaks in DNA that arise appear to be efficiently repaired in the generative cell, but not in the vegetative cell, during the transport process to the female gametophyte. See also Evolutionary history of plants Flowering plant Self - incompatibility in plants Siphonogamy References ^ Jump up to : Geitmann, Anja ; Palanivelu Ravishankar ( 2007 ). `` Fertilization requires communication : Signal generation and perception during pollen tube guidance ''. Floriculture and Ornamental Biotechnology. 1 : 77 -- 89. ^ Jump up to : Malhó, Rui ( 2006 ). The pollen tube : a cellular and molecular perspective. Springer. Jump up ^ Gossot, Olivier ; Geitmann Anja ( 2007 ). `` Pollen tube growth : coping with mechanical obstacles involves the cytoskeleton ''. Planta. 226 ( 2 ) : 405 -- 416. doi : 10.1007 / s00425 - 007 - 0491 - 5. PMID 17318608. Jump up ^ Messerli, Mark ; et al. ( 2000 ). `` Periodic increases in elongation rate precede increases in cytosolic Ca2+ during pollen tube growth ''. Developmental Biology. 222 ( 1 ) : 84 -- 98. doi : 10.1006 / dbio. 2000.9709. PMID 10885748. Jump up ^ Malhó, Rui ( 1998 ). `` Pollen tube guidance -- the long and winding road ''. Sexual Plant Reproduction. 11 ( 5 ) : 242 -- 244. doi : 10.1007 / s004970050148. Jump up ^ Okuda, Satohiro ; Higashiyama Tetsuya ( 2010 ). `` Pollen tube guidance by attractant molecules : LUREs ''. Cell Structure and Function. 35 ( 1 ) : 45 -- 52. doi : 10.1247 / csf. 10003. PMID 20562497. Jump up ^ Mascarenhas, Joseph ; Machlis Leonard ( 1964 ). `` Chemotropic response of the pollen of Antirrhinum majus to calcium ''. Plant Physiology. 39 ( 1 ) : 70 -- 77. doi : 10.1104 / pp. 39.1. 70. PMC 550029. PMID 16655882. Jump up ^ Robinson, Kenneth ( 1985 ). `` The Responses of Cells to Electrical Fields : A Review ''. The Journal of Cell Biology. 101. doi : 10.1083 / jcb. 101.6. 2023. PMC 2114002. PMID 3905820. Jump up ^ Chebli, Youssef ; Geitmann Anja ( 2007 ). `` Mechanical principles governing pollen tube growth ''. Functional Plant Science and Biotechnology. 1 : 232 -- 245. ^ Jump up to : Hirano T, Takagi K, Hoshino Y, Abe T ( 2013 ). `` DNA damage response in male gametes of Cyrtanthus mackenii during pollen tube growth ''. AoB Plants. 5 : plt004. doi : 10.1093 / aobpla / plt004. PMC 3583183. PMID 23550213. 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Question: where is the pollen tube on a flower
Answer: a tubular protrusion from the pollen grain