How To Use Pollen tube In A Sentence
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In the new study, the researchers surveyed more than 2,000 proteins expressed on synergid cells to clinch the exact molecules luring pollen tubes to the embryo sac.
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In several cases the pollen tubes emerged and elongated rapidly, then burst, with the cytoplasm streaming out of the burst tip.
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The number of pollen tubes and ovules in the ovaries of each of six dissected pistils from each cross is shown.
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The results presented suggest that in normal growing pollen tubes, a net exocytic flow occurs in the flanks of the tube apex mediated by SYP124.
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Transmitted light micrographs of the same samples (H and J) show GUS activity in pollen tubes.
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No differences were noted in pollen germination, pollen tube growth or fertilization between experimental tests of xenogamy and geitonogamy in S. mucugensis.
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Within the ovary, pollen tubes also grew in the ECM to penetrate the micropyle and subsequently grew intercellularly within the nucellus up to the embryo sac.
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The ovule micropyle and embryo sac were penetrated equally by cross- and self-pollen tubes.
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The path of pollen tubes has not been investigated, as male flowers were not available.
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It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules.
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Then they conjugated the quantum dots with the amine groups of stigma / stylar cysteine-rich adhesin - a plant pollen tube adhesion protein.
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Flowers of all species under study were selfed to determine the time taken by pollen tubes to reach the ovules.
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Networks of plunder: Archaeologists tracing the labyrinth of antiquities trafficking hope to shut it down, or at least slow it up Pollen tubes gravitate toward LURE1 protein (left, fluorescent green) expressed by synergid cells around Satohiro Okuda (left) and Tetsuya Higashiyama
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Rather, Rounds showed, by treating pollen tubes with growth inhibitors including cyanide, oligomycin and antimycin-A, that pollen tubes can withstand such toxins and after an adjustment period will begin to grow again but at a slower rate while still exhibiting growth oscillations described above.
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However, pollen tubes from control pollen showed normal morphology when growing towards the micropyle of an ovule in a HTS plant.
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Finally the pollen tube penetrates down to and through the open neck of the archegonium, until it comes in contact with the egg cell.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
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In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation.
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As pollen grains and pollen tubes emitted very strong fluorescence, the pathways of growing pollen tubes could be easily observed.
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This has been used previously to detect ethylene biosynthesis successfully from a variety of flowers and floral tissues including styles and during pollen tube growth.
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Coupling these screens with a visual assessment of seed formation has yielded mutants defective in FG development or in the ability of pollen tubes to release their sperm after entering the micropyle.
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Pollen tubes then exit the site of intercellular growth at the base of the funiculus where they continue to grow within the ovary locule along the adaxial carpel surface to finally enter the ovule micropyle.
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In them there are these differences from the above process: the contents of the male cell, represented by the pollen, are not differentiated into spermatozoids, and there is no actual contact between the contents of the pollen tube and the germinal vesicle, but according to Strashurger, there is a transference of the substance of the nucleus of the pollen cell to that of the germinal vesicle by osmose.
Scientific American Supplement, No. 531, March 6, 1886
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Less coherent expression was detected in the endodermis of the root elongation zone, in the stem of the young inflorescence, pollen tubes, base of axillary buds, ovules, chalazal endosperm, and fruit abscission zone.
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The continuous polarized vesicle secretion in pollen tubes is essential for tip growth but the location of endo - and exocytic sub-domains remains however controversial.
BioMed Central - Latest articles
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However, in a separate study, we observed that the amount and elongation rate of self-pollinated pollen tubes in the styles did not differ from those that were cross-pollinated.
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Measurements of pollen tube length were recorded directly by an ocular micrometer fitted to the eyepiece of the microscope.
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This protein has a pectate lyase enzyme activity and could be involved in cell wall elaboration during germination and pollen tube growth.
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Defensin-like polypeptide LUREs are pollen tube attractants secreted from synergid cells.
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For example, petals may wilt and abscise more rapidly after pollen deposition on the stigma or pollen tube growth through the style.
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Similar to pollen germination, the modified bilinear function described the response of pollen tube length to temperature.
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We also show that cellular responses are propagated in a basipetal direction in P. rhoeas pollen tubes.
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Pollen tube growth is arrested by a cascade of events associated with an increase in cytosolic calcium and a disruption of the cytoskeleton.
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If both of the ovaries in a flower contained pollen tubes a mean value was used in the analyses.
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At the septum, pollen tubes migrate into the ovary and approach an ovule containing an FG.
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Only one pollen tube tip entered the nucellus through the micropyle.
