Pollen Development in Actinidia deliciosa var. deliciosa: Histochemistry of the Microspore Mother Cell Walls
Annals of Botany
, 1990. V. 65. No. 3. P. 231–239
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The development of the microspore mother cell walls in Actinidia deliciosa (kiwifruit) has been studied using light and electron microscopy. The microspore mother cell wall is similar, histochemically, and structurally in anthers from both functionally staminate and functionally pistillate flowers. Deposition, which begins during early prophase I, produces an electron-dense multilaminated wall layer (layer a) and by the end of meiosis I a thick electron-lucent layer (layer b) to the inside of this multilayered wall. The reasons for histochemical differences and similarities between these layers are discussed. The original primary wall persists until the late uninucleate microspore stage. Layer (b), which is probably mainly callose, dissolves at the late tetrad/early microspore stage while layer (a), which probably also contains other polysaccharides, persists and dissolves concurrently with the primary wall.