The palynological characterization and the pollen potential germination of Rhododendron racemosum french

Abstract

The palinological characterization of Rhododendron racemosum highlights the organization of pollen in the pollen tetrade maintained by viscin threads. The set of determinations related to pollen morphology (the color of pollen grains, the ornamentation of exin, the pollen tetrad size, the number of pore/pollen grain) from Rhododendron racemosum complements the information in the literature regarding the characterization of from this taxon. To test the germination potential were used many variations of nutrient medium with different concentrations in sugar from 0% to 100%. The pollen germination of Rhododendron racemosum is expressed in the highest degree on the nutrient medium enriched with 25% sucrose, 168 hours after inoculation. Very high germination capacity, over 90% to Rhododendron racemosum pollen demonstrates that the pollen meiosis in this genotype is balanced and the male gametes are fertile. The data obtained have theoretical importance (in taxonomy) and in getting interspecific hybrids within the genus Rhododendron.