Palynological observations on the genus Gundelia L. (Asteraceae) growing in Turkey


Fırat M. , Selvi S.

Phytotaxa, vol.502, no.1, pp.51-66, 2021 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 502 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.11646/phytotaxa.502.1.3
  • Title of Journal : Phytotaxa
  • Page Numbers: pp.51-66

Abstract

The pollen morphology of 17 taxa of Gundelia, of which 13 taxa are endemic to Turkey, was investigated by light microscopy

(LM) and scanning electron microscopy (SEM). In this study, the pollen morphology of 16 taxa except G. tournefortii was

investigated for the first time. The quantitative data were analyzed by descriptive statistics and multivariate statistics. The

pollen grains are oblate spheroidal and prolate spheroidal in shape with the polar diameter of 37.01–61.2 μm and the equatorial

diameter of 31.2–63.4 μm. The smallest pollen grains were observed in G. anatolica, G. rosea and G. tournefortii, while the

largest pollen grains were observed in G. vitekii, G. komagenensis and G. colemerikensis. Pollen ornamentation is echinate in

LM and echinate-microperforate in SEM. Statistically, the relationships between pollen characters of the examined taxa were

identified using Principal Component Analysis (PCA) and Clustering Analyzis. In addition, a dendrogram was constructed

by applying UPGMA based on the determined 15 pollen morphological characters, and the degree of their relationship

was discussed. Polar axis, equatorial diameter and colpus length were the major explanations of the pollen morphological

characters’ total variation in PCA. Pair group method was used to divide the main pollen taxa into three groups based on the

pollen morphology by using arithmetic averages analysis (PCA scatterplot and cluster analysis). As a result, the pollen shape,

polar axis, equatorial diameter and spine length were important characters distingushing the taxa from each other. We found

some matches and mismatches between pollen and morphological characters, whose significance requires further study.