Pollen Morphology of 15 Cultivars of Freesia hybrida

doi:10.7525/j.issn.1673-5102.2019.01.003

Abstract

Abstract: Pollen morphology of 15 cultivars of Freesia hybrida was measured using scanning electron microscopy(SEM), and then the similarity and differences among cultivars were evaluated by the shape, size, exine ornamentation and aperture of pollen. The pollens of the 15 cultivars of F.hybrida are all single and zygomorphic with far polar single germinal furrow. All pollen grains are elliptical in shape and boat-like or heart-like in polar view while long spheroidal shape in equatorial view of all investigated cultivars except Castor. The exine of Freesia was interspersed with spininess, and the pollen surface of most cultivars has circular holes and circular markings. Furthermore, the 15 cultivars of Freesia were classed into three groups based on these pollen characteristics by cluster analysis. Taken all together, pollen morphology of Freesia plants was studied in the present study at the first time, and we also found the moderate differences of pollen morphology possessed among cultivars, especially in the characters of exine ornamentation and aperture of pollen, which demonstrated the genetic diversity and divergence in Freesia. Our findings will be valuable to analyze the phylogenetic relationship among the Freesia accessions in future.

Key words: Freesia hybrida, pollen morphology, relationship, scanning electron microscopy

CLC Number:

Q949.71+8.28

SUN Yi, DING Su-Qin, SHI Yi-Min, TANG Dong-Qin. Pollen Morphology of 15 Cultivars of Freesia hybrida[J]. Bulletin of Botanical Research, 2019, 39(1): 17-26.

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