Nonmotile sperm both wind and insect pollinated
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Although lacking certain inclusions, the extreme apex contains numerous secretory vesicles, as well as elements of the endoplasmic reticulum ER , mitochondria, and Golgi dictyosomes figure 2. The localized ER and mitochondria are strong candidates for the sequestering system because they occur at high density at the base of the clear zone. preliminary evidence also shows that the ER takes up calcium and transports it basally Wilsen It has been argued that ROPs control pollen tube growth through their regulation of both calcium and actin cytoskeletal dynamics Hwang and Yang The sperm cells then travel in the cytoplasm of the large vegetative cell of the pollen tube to their target. Other articles you might like. One important entity that could be regulated by pH is the formation and activity of the actin cytoskeleton. The explanation may derive from the observation that the tip-focused calcium gradient, even at its low point, is close to or above the threshold for stimulation of secretion. All of the cytoplasmic inclusions undergo continuous cytoplasmic streaming, in which they flow forward along the edge of the cell and rearward through the central core. Nonetheless, it has been shown, using low dye concentrations, that growing pollen tubes exhibit an intracellular pH gradient figure 4 , bottom row. Kost and colleagues
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