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  • Pollen ultrastructure in Aristolochia manshuriensis and A. contorta (Aristolochiaceae).

    Author(s) : Nakonechnaya, O. V.Kalachev, A. V.

    Author Affiliation : Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch, Russian Academy of Sciences, Pr. 100 let Vladivostoku 159, Vladivostok 690022, Russia.

    Author Email : markelova@biosoil.ru

    Journal article : Protoplasma 2018 Vol.255 No.5 pp.1309-1316

    Abstract : Pollen ultrastructureultrastructureSubject Category: Miscellaneous
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    has been studied in two relict and rare species of the genus AristolochiaaristolochiaSubject Category: Organism Names
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    , A. contorta Bunge and A. manshuriensis Kom. (AristolochiaceaearistolochiaceaeSubject Category: Organism Names
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    ). Both species have inaperturate, spheroidal, sometimes distally monocolpate or distally bicolpate pollen grains. The equatorial and polar axes of pollen grain in A. manshuriensis are 48.5 and 44.0 µm, respectively. The percentage of defective pollen grains in A. manshuriensis is 3.4%. The fossulate, perforated exine is up to 2.3 µm in thickness; the sexine and the nexine are almost equal in thickness. In A. contorta, the equatorial axis of pollen grain is 36.6 µm: the defectiveness percentage, 24.5%. The exine is verrucate, up to 0.3 µm in thickness, while the sexine is two to three times thicker than the nexine. The pollen germinationpollen germinationSubject Category: Natural Processes
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    experiments have shown that pollen of A. manshuriensis, in contrast to A. contorta, can germinate in 10-20% sucrosesucroseSubject Category: Chemicals and Chemical Groups
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    at 22°C. These data and the high percentage of pollen defectiveness in A. contorta indicate that the androeciumandroeciumSubject Category: Anatomical and Morphological Structures
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    function in this species is reduced. The reduction of the androecium function is evidenced by a small amount of pollen grains in anthersanthersSubject Category: Anatomical and Morphological Structures
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    or empty anthers and a high percentage of defective pollen grains.

    ISSN : 0033-183X

    DOI : 10.1007/s00709-018-1230-4

    Record Number : 20203133325

    Publisher : Springer-Wien

    Location of publication : Wien

    Country of publication : Austria

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : AristolochiaaristolochiaSubject Category: Organism Names
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    Descriptor(s) : androeciumandroeciumSubject Category: Anatomical and Morphological Structures
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    , anthersanthersSubject Category: Anatomical and Morphological Structures
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    , pollenpollenSubject Category: Anatomical and Morphological Structures
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    , pollen germinationpollen germinationSubject Category: Natural Processes
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    , sucrosesucroseSubject Category: Chemicals and Chemical Groups
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    , ultrastructureultrastructureSubject Category: Miscellaneous
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    Identifier(s) : Aristolochia contorta, Aristolochia manshuriensis, saccharose

    Broader term(s) : AristolochiaceaearistolochiaceaeSubject Category: Organism Names
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    , PiperalespiperalesSubject Category: Organism Names
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    , magnoliidsmagnoliidsSubject Category: Organism Names
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    , angiospermsangiospermsSubject Category: Organism Names
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    , SpermatophytaspermatophytaSubject Category: Organism Names
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    , plantsplantsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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