Mature pollen grains of Sambucus nigra L. are tricolporate, isopolar, 12.5 mm wide, 25 mm long, and tricellular. They have a tectate exine, a bilayered nexine, and a thin intine. The vegetative cell has abundant rough endoplasmic reticulum, many well-structured mitochondria, numerous apparently inactive dictyosomes, immature dividing, and starch-filled plastids and lipid bodies. The sperm cells have few and poorly structured organelles. They are linked by cytoplasmic bridges, indicating a persistent physiological unit, and are surrounded by fibrillar polysaccharide material. Freshly released pollen is 95% viable. Three- and 4-year-old pollen grains stored at 20C are 78.2% and 43% viable, respectively. In vitro germination requirements and pollen tube growth are more similar to those of bicellular pollen than to those of tricellular pollen.
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|Titolo:||Ultrastructure, viability, and in vitro germination of the tricellular Sambucus nigra L. pollen|
|Rivista:||INTERNATIONAL JOURNAL OF PLANT SCIENCES|
|Citazione:||Muccifora, S., Bellani, L., & Gori, P. (2003). Ultrastructure, viability, and in vitro germination of the tricellular Sambucus nigra L. pollen. INTERNATIONAL JOURNAL OF PLANT SCIENCES, 164, 855-860.|
|Appare nelle tipologie:||1.1 Articolo in rivista|