Pollen ultrastructure in different vine cultivars with low productivity
DOI:
https://doi.org/10.5073/vitis.1978.17.221-228Abstract
The morphology of pollen grains of different vine cultivars has been examined by transmission and scanning electron microscopy to see if a correlation could be found between low productivity and the presence of acolporated pollen. Actually, it was found that in the examined cultivars with low productivity the pollen is round, deprived of furrows and germinative pores, and surrounded by a continuous layer of bacula and tegmen. However, high productivity is not always correlated with the presence of colporated pollen, as is the case with the flowers of the feathers of Picolit.
Die Feinstruktur der Pollenkörner bei verschiedenen ertragsschwachen Rebensorten
Um einen möglichen Zusammenhang zwischen niedriger Ertragsleistung und dem Vorkommen acolporater, d. h. ungefurchter und porenloser Pollenkörner aufzudecken, wurde bei einer Reihe von Rebensorten mit Hilfe der Raster- und Transmissionselektronenmikroskopie die Morphologie der Pollenkörner untersucht. Es konnte tatsächlich festgestellt werden, daß die Pollenkörner der untersuchten ertragsschwachen Sorten kugelig, ohne Keimfurchen und ohne Keimporen sind und daß Bacula und Tegmen eine geschlossene Schicht bilden. Ein hoher Ertrag ist jedoch nicht immer mit colporaten und keimfähigen Pollenkörnern korreliert; eine solche Ausnahme bilden z. B. die Blüten an den Geiztrieben der Rebensorte Picolit.
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