Fluorophore-conjugated lectin labeling of the cell surface of isolated male and female gametes, central cells and synergids before and after ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-12

AUTHORS

Meng-Xiang Sun, Erhard Kranz, Hong-Yuan Yang, Horst Lörz, Alessandra Moscatelli, Mauro Cresti

ABSTRACT

Three fluorescein isothiocyanate (FITC)-conjugated lectins, Canavalia ensiformis agglutinin (Con A), Triticum vulgaris agglutinin (WGA) and Phaseolus vulgaris erythroagglutinin (PHA-E), were used as probes to localize sugar moieties of glycoconjugates on the cell surface of isolated maize sperm, egg, central, antipodal cells, synergids, and in vitro- and in vivo-fertilized zygotes. Fluorescence signals on the surface of the cells were due to specific binding. Calcium was necessary for WGA and PHA-E binding and enhanced Con A labeling. Differences in glycoconjugate composition of the membranes of gametes and other embryo sac component cells were found. FITC-Con A strongly labeled egg and central cells, but labeled sperm only weakly. FITC-WGA binding sites were detected on egg, but not sperm cells. Con A and WGA binding sites were equally distributed around egg and central cell protoplasts. FITC-PHA-E binding sites were not found on sperm and egg cells before fertilization. Binding sites of these lectins were located on synergids, especially on their filiform apparatus. Interestingly, WGA binding to egg cells was enhanced after fertilization, whereas PHA-E binding to egg cell membranes could only be detected after fertilization. These results suggest the occurrence of fertilization-induced changes in glycoconjugate composition of the maize egg cell membrane. An increase in the number of WGA and PHA-E binding sites was also observed on newly formed cell walls of cultured two-celled embryos derived from in vitro-produced zygotes. More... »

PAGES

159-166

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00497-002-0147-3

DOI

http://dx.doi.org/10.1007/s00497-002-0147-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1020591133


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