Journal
PLANT SYSTEMATICS AND EVOLUTION
Volume 262, Issue 1-2, Pages 89-96Publisher
SPRINGER WIEN
DOI: 10.1007/s00606-006-0450-9
Keywords
explanted Crocus ovules; micropylar secretion; Ca+2 concentration; pollen germination; ovule penetration
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The micropylar secrete of the ovules of Crocus vernus ssp. vernus was analyzed for the Ca+2 content by atomic absorption, and its capacity to germinate and attract pollen was tested by pollinating explanted ovules, and incubating in absence of culture medium. The results display a Ca+2 concentration of 28.9 mM in the micropylar secrete. On this secrete both compatible- and incompatible pollen germinates with a mean percentage of 53.7%, and their pollen tubes enter the micropylar canal with percentages of 32.3% to 21.0%. In situ the ovules fail to attract tubes of incompatible pollen. The results are discussed in relation to the ovule receptivity and the guided growth of pollen tubes, substantiating the model of the tropic growth towards increasing calcium concentrations.
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