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  • Orchidaceae  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Temporal variation in pollinarium size after its removal in species of Bulbophyllum: A different mechanism preventing self-pollination in Orchidaceae (1999)
    Springer
    Plant systematics and evolution 217 (1999), S. 197-204 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Bulbophyllum ; Pollination ; reproductive system ; self-pollination ; pollinator behaviour ; myophily ; pollinia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract InBulbophyllum involutum andB. ipanemense (Orchidaceae), two closely related species, shortly after removal the pollinarium has a diameter of approximately twice that of the entrance of the stigmatic cavity, requiring a mean time of 105 to 135 minutes to shrink in width and allow pollination. Because the pollinators of these species remain for some minutes in the same flower after removing the pollinia this mechanism, previously unknown inOrchidaceae, may be very important in preventing self-pollination. This mechanism does not occur inB. weddellii, and the pollinator does not remain in the flower after removing the pollinia. The smaller diameter of the stigmatic cavity inB. involutum reduces by 50% the chances of interspecific pollination withB. weddellii, and interspecific crossing is strictly unidirectional. This is important in maintaining isolation between these sympatric species, which share the same pollinators and have synchronized flowering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984365
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reproductive systems and crossing potential in three species ofBulbophyllum (Orchidaceae) occurring in Brazilian ‘campo rupestre’ vegetation (1999)
    Springer
    Plant systematics and evolution 217 (1999), S. 205-214 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Bulbophyllum ; Pollination ; reproductive system ; self-pollination ; hybridisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experimental self-, cross- and interspecific pollinations were carried out inBulbophyllum weddellii, B. involutum andB. ipanemense (Orchidaceae). The last two species are closely related, butB. weddellii is somewhat more distant. The three species are self-compatible, with pollination by a vector necessary for fruit formation. In all crossing types, high rates of fruit abortion and formation of seeds without embryos were observed, particularly in interspecific crosses that involvedB. weddellii. Crosses between the more closely relatedB. involutum andB. ipanemense produced fruit formation rates and seed viability similar to those obtained in intraspecific crosses. These results agree with current hypotheses that suggest that interspecific crossing rates reflect phylogenetic proximity. Examination of pollen tube growth and aborted fruits suggests that a series of factors may be involved in the high abortion rate for fruits and large proportion of seeds without embryos. The low interspecific fertility noted forB. weddellii andB. involutum is important in the maintenance of isolation between these species that are sympatric, flower in the same period and share the same pollinators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984366
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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