Pollen morphological investigations of family Cactaceae and its taxonomic implication by light microscopy and scanning electron microscopy.
Cactaceae
Pantoporate
SEM
aperture
pollen morphology
Journal
Microscopy research and technique
ISSN: 1097-0029
Titre abrégé: Microsc Res Tech
Pays: United States
ID NLM: 9203012
Informations de publication
Date de publication:
Jul 2020
Jul 2020
Historique:
received:
07
12
2019
revised:
20
01
2020
accepted:
18
02
2020
pubmed:
7
3
2020
medline:
2
2
2021
entrez:
6
3
2020
Statut:
ppublish
Résumé
The family Cactaceae is the diversified group of angiosperm plants whose pollen statistics has been used for taxonomic identification. In this article, we present the pollen morphology of eight species belong to seven taxonomically complex genera of Cactaceae including Astrophytum, Cylindropuntia, Echinocereus, Echinopsis, Mammillaria, Opuntia, and Thelocactus using light and scanning electron microscopy. The pollen grains were acetolyzed, measured, described, and electron photomicrographs were taken. Cactaceae can be characterized by presenting different palynomorphological features including pollen type, sculpturing, polar and equatorial diameter, aperture orientation, exine thickness, P/E ratio, and echini features. Four types of pollen shapes, that is, prolate spheroidal (three species), subprolate (two species), prolate (two species), and oblate spheroidal in Echinocereus reichenbachii were observed. The polar and equatorial diameter observed maximum in O. ficus indica 116.95 and 112.27 μm while minimum in M. compressa 38.42 and 21.05 μm. Pollen of two types, tricolpate in members of subfamily Cactioideae and pantoporate in the Opuntioideae were examined. The fertility percentage has been observed maximum in Opuntia macrocentra (83.84%) and minimum in Opuntia ficus-indica (57.89%). Exine sculpturing showing great variations such as granulate, reticulate, granulate perforate and micro-echinate foveolate ornamentation was examined only in Echinopsis eyriesii. A key to species, based on pollen micromorphological attributes, has been constructed for correct identification of complex cactus species.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
767-777Informations de copyright
© 2020 Wiley Periodicals, Inc.
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