A palynological study of the genus Nepeta L. (Lamiaceae)


Çelenk S., Dirmenci T., Malyer H., Bıçakçı A.

PLANT SYSTEMATICS AND EVOLUTION, vol.276, pp.105-123, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 276
  • Publication Date: 2008
  • Doi Number: 10.1007/s00606-008-0062-7
  • Journal Name: PLANT SYSTEMATICS AND EVOLUTION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.105-123
  • Keywords: Infrageneric classification, Lamiaceae, LM, Nepeta, Pollen morphology, SEM, POLLEN MORPHOLOGY, LABIATAE, TURKEY
  • Bursa Uludag University Affiliated: Yes

Abstract

The pollen morphology of forty taxa of the genus Nepeta L. was studied and documented in detail using light microscopy (LM) and scanning electron (SEM) microscopy in this study. Nepeta L. pollen grains are small to large (P = 18.64-63.46 mu m, E = 15.62-46.33 mu m), suboblate to perprolate (P/E = 0.86-2.09) in shape and hexacolpate (very rarely tetracolpate) with granular membranes. Alternate position of colpi occurs in six Nepeta taxa, N. nuda ssp. glandulifera, N. concolor, N. crinita, N. congesta var. cryptantha, N. stricta var. stricta and N. sibthorpii ssp. tumeniana. In examinations of exine ornamentation with SEM, two types of pollen grains were recognized: (1) type I, with microreticulate sculpture; and (2) type II with bireticulate sculpture, type I and II to be divided into two and five subtypes, respectively. In the two taxa with microreticulate pattern, N. pilinux and N. sulfuriflora, a tendency towards a bireticulum could be recognized due to traces of secondary tectal connections. The bireticulate exine ornamentation is characterized with varying characteristics of the primary muri and secondary reticulum. Pollen morphology within the genus is compared with infrageneric relationships.