Abstract:
The paper presents the characteristics of the germination process in
Trifolium montanum L. and T. pannonicum Jacq. pollen. We made estimates
on the length of pollinic tubes in the dynamics of germination (after 3, 24, 48
and 72 hours since the inoculation on medium), according to the glucidic
concentration of the nutritive mediums used in this experiment. We pointed
out the maximum lengths of the pollinic tubes, correlated to the lengths of
flower stiles from the two taxons. Achieving a certain length of the pollinic
tubes is very important, because the fertilization of ovules is thus ensured
and, implicitly, the fructification of the respective taxons. We also referred to
the way of the emergence of pollinic tubes from the two taxons. The bicellular
pollen-type of the two fabaceae is shown by pointing out the generative cell
in the pollinic cell, which, after the mitotic division, produces two spermatic
cells having the value of immobile male gametes. We have also shown the
type of anomalies of the pollinic tubes and the frequency of these anomalies
during the process of pollen germination at the two taxons from the
Fabaceae family. The obtained results were correlated to the different
polyploidity degree of the two taxons, to pollen germinating potential, to
geographic spreading area, and to native resistance of the two taxons to
various abiotic factors. Although the phylogenetic connection between the
two investigated taxons is very tight, there are distinctive traits of the
germinating process, which have a diagnosis value and may represent
valuable genetic and physiological indicators.
