01402nab a2200241 a 4500003000900000005001700009008004100026041000800067100002000075700001700095245015700112264000900269300001600278500001400294520060900308650001300917650001400930650001000944773014700954035001701101001000701118040003501125AR-ReUNN20260702003308.0260630s2006    ag |||||||||||||||||eng  0 aeng1 aMajumdar, S. K.1 aLowry, R. J.13aAn electron microscope study of the barrier between vegetative and generative nuclei in the pollen of Gasteria armstrongii / S. K. Majumdar; R. J. Lowry 1c2006  a5 páginas  afot. byn.  aUltrastructure studies of the pollen grains of Gasteria armstrongii revealed the existence of a barrier between the vegetative and generative nuclei. The layer is continuous with the intine of the pollen wall. It is suggested that the cisternae of the endoplasmic reticulum appear between the two nuclei and deposition of pectic substances occurs in them. Later the pectine containing cisternae line up in the equatorial region and fuse to from the layer. Finally the layer separates from the intine and becomes the envelope around the generative nucleus. The chemical nature of the barrier is discussed. 4aGasteria 4aLiliaceae 4aPolen0 tPhyton : Revista Internacional de Botánica Experimental = International Journal of Experimental Botanyx0031-9457gv. 28 n. 2 (1971)w238927  a(IBONE)34595239009  aAR-ReUNNbspacAR-ReUNNeaacr2