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Abstract
Characterization by SEM of the pollen of some species of Citrus and related genera at two ploidy levels (2x and 4x).—The pollen grain morphology of some Citrus species, of some related genera, and of some intergeneric hybrids is described.
The study made with the SEM has shown: a) the more typical shape of Citrus pollen is spheroidal with four furrows; the sculptures of ektexine in all Citrus species can be an useful character for taxonomy; the ektexine can be pitted (especially in edible citrus fruits) or reticulated as (in some species valuable as rootstock); in two types of ektexine there are differences that can allow the individualization of some species; these preliminary observations do not allow to indicate useful elements to individualize the cultivars of the same species; b) pollen morphology is a valid diagnostic criterion for the ploidy levels 2x and 4x of the same species in the genera Citrus and Poncirus; pollen of tetraploid plants is larger and has a higher number of furrows than pollen of diploid plants; c) the sculptures of ektexine in the other genera and intergeneric hybrids show some degree of relationship with the genus Citrus.