An ultrastructural study of pollen development in tomato (Lycopersicon esculentum). I. Tetrad to early binucleate microspore stage

cell ultrastructure cell walls citoplasma cytoplasm cytoplasme developmental stages endoplasmic reticulum etapas de desarrollo etapas de desarrollo de la planta lycopersicon esculentum mitochondria mitochondrie mitocondria pared celular paroi cellulaire plant developmental stages plaste plastidios plastids polen pollen ribosomas ribosome ribosomes ultraestructura ultrastructure vacuole vacuoles