Journal
BOTANY LETTERS
Volume 163, Issue 4, Pages 449-451Publisher
SOC BOTANIQUE FRANCE
DOI: 10.1080/23818107.2016.1234975
Keywords
Anabaena azollae; Azolla filiculoides; extra sheath; heterocyst; histochemistry
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Funding
- Foundation for Science and Technology-Ministry of Science and Higher Education (FCT-MCES) under Operational Program Science, Technology and Innovation (POCTI)
- European Social Funding-III Community Support Framework (FSE-III QCA) [PRAXIS XXI/BD/21325/99]
- Fundação para a Ciência e a Tecnologia [PRAXIS XXI/BD/21325/99] Funding Source: FCT
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The fern Azolla filiculoides Lamarck (family Azollaceae) harbours a heterocystous nitrogen-fixing cyanobacterium Anabaena azollae Strasburger (Nostocales: Cyanobacteria) inside cavities on the dorsal lobes of the leaves. A new extra sheath was detected under scanning electron microscopy surrounding only the heterocysts of the cyanobiont and their chemical characterization by histochemical tests has pointed to the presence of proteins. The function of this extra sheath is unknown.
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