01491nab a2200265 a 4500003000900000005001700009008004100026041000800067100002800075700002500103245015700128264000900285300001600294500001400310520060900324650002100933650002200954650001600976773014700992942000801139035001701147001000701164999001901171040003501190AR-ReUNN20260702003308.0260630s2006    ag |||||||||||||||||eng  0 aeng1 aMajumdar, S. K.91545051 aLowry, R. J.915450613aAn 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. 4aGasteria9154507 4aLiliaceae9115697 4aPolen962540 tPhyton : Revista Internacional de Botánica Experimental = International Journal of Experimental Botanyx0031-9457gv. 28 n. 2 (1971)w238927  cART  a(IBONE)34595239009  c239009d239009  aAR-ReUNNbspacAR-ReUNNeaacr2