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The pollen tubes of the wild-type plants had a greater pollen tube length than the mutants, but the mutants had a greater tube width. This greater pollen tube width within the mutants indicates the decrease in the growth of polarized cells and thus decrease in tip growth.
They are implicated in various aspects of plant growth and development, including root elongation, somatic embryogenesis, hormone responses, xylem differentiation, pollen tube growth and guidance, programmed cell death, cell expansion, salt tolerance, host-pathogen interactions, and cellular signaling.
Work done on tobacco plants revealed a family of glycoproteins called TTS proteins that enhanced growth of pollen tubes. [9] Pollen tubes in a sugar free pollen germination medium and a medium with purified TTS proteins both grew. However, in the TTS medium, the tubes grew at a rate 3x that of the sugar-free medium. [9]
They are easily cultivated in vitro and have a very dynamic cytoskeleton that polymerizes at very high rates, providing the pollen tube with interesting growth properties. [7] For instance, the pollen tube has an unusual kind of growth; it extends exclusively at its apex. Pollen tubes, as most biological systems, are influenced by electrical ...
Some plants use the control of pollen germination as a way to prevent this self-pollination. Germination and growth of the pollen tube involve molecular signaling between stigma and pollen. In self-incompatibility in plants, the stigma of certain plants can molecularly recognize pollen from the same plant and prevent it from germinating. [15]
The protons are effluxed at a region on the sides of the tube that corresponds to the location of the intracellular alkaline band. [71] Energy is required for pollen tube growth [72] and an H +-ATPase may mediate the efflux. Hepler has shown that the magnitude of the intracellular calcium and proton gradients and the extracellular fluxes of ...
May says the best way to prevent microbial growth is to have a clean central air system and use a pleated media filter with a MERV (Minimum Efficiency Reporting Values) rating of 11. The rating ...
If the pollen is compatible it will germinate and begin to grow. [5] The ovary releases chemicals that stimulates a positive chemotropic response from the developing pollen tube. [6] In response the tube develops a defined tip growth area that promotes directional growth and elongation of the pollen tube due to a calcium gradient. [5]
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