Fig. 7
Evaluation of pollen functionality and morphology. (a) Pictures of some Sangiovese, Corinto Nero, Pedro Ximenez and Corinto Bianco pollen grains subjected to the viability (on the left) and germination (on the right) in vitro tests, as observed at the microscope (200X). (b) Mean values (± standard error) of pollen viability and germination percentage per accession; N is the number of replicates. The total number of observed pollen grains per accession ranged from a minimum of 1040 to a maximum of 4528, in relation to the available inflorescences. To detect differences between each seeded variety and its seedless variant, the non-parametric Kolmogorov-Smirnov test was performed. (c) Box plots representing the polar and equatorial axis lengths measured on fifty randomly selected pollen grains for each genotype in each season. Abbreviations: ax = axis, SD = standard deviation, Std. err = standard error