Results 91 to 100 of about 502,822 (117)
DEVELOPMENTAL ANATOMY OF CORALLOID ROOTS IN CYCADS [PDF]
American Journal of Botany, 1975 Coralloid roots of cycads were found to originate endogenously from the pericycle of apogeotropic secondary roots or adventitious roots that have become exposed or nearly exposed to the soil surface. All mature coralloid roots are susceptible to infection by algal endophytes, which seem to enter from the soil through a break in the dermal layers.In the
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High cyanobacterial diversity in coralloid roots of cycads revealed by PCR fingerprinting [PDF]
FEMS Microbiology Ecology, 2002 The genetic diversity of symbiotic cyanobacteria in coralloid roots of cycads was examined using PCR fingerprinting with primers derived from repetitive sequences. The highest genetic resolution was achieved using the primer corresponding to the short tandemly repeated repetitive sequences. The cyanobacteria were collected from the coralloid roots of a
Birgitta Bergman
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Pathways of assimilation and transfer of fixed nitrogen in coralloid roots of cycad-Nostoc symbioses [PDF]
Planta, 1988 Freshly detached coralloid roots of several cycad species were found to bleed spontaneously from xylem, permitting identification of products of nitrogen transfer from symbiotic organ to host. Structural features relevant to the export of fixed N were described for Macrozamia riedlei (Fisch. ex Gaud.) Gardn. the principal species studied.
Peter Lindblad, C A Atkins, John S Pate
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ON THE PHYCOBIONTS OF THE CYCAD CORALLOID ROOTS [PDF]
New Phytologist, 1980 SummaryThe structure, ultrastructure and the developmental cycle of the phycobionts living in the coralloid roots of various cycads growing in different Italian Botanical Gardens were studied. The phycobionts were examined in the various zones of the coralloids from the top towards the base. All the phycobionts observed have the characteristics typical
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Regeneration of coralloid roots on cycad megagametophytes
Plant Science Letters, 1980Abstract Megagametophytes of Cycas revoluta Thunb. incubated in White's Basal Medium regenerated coralloid roots only in the presence of 2,4-D and kinetin. No microorganism was detected in the cultures. These results suggest that coralloid roots are an inherent feature of the cycad root system and that their formation is not induced by any ...
Paolo de Luca
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Phylometagenomics of cycad coralloid roots reveals shared symbiotic signals
Microbial GenomicsCycads are known to host symbiotic cyanobacteria, including Nostocales species, as well as other sympatric bacterial taxa within their specialized coralloid roots. Yet, it is unknown if these bacteria share a phylogenetic origin and/or common genomic functions that allow them to engage in facultative symbiosis with cycad roots.
Michelle Gehringer +2 more
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Coralloid root regeneration on Macrozamia megagametophites
Giornale botanico italiano, 1980Abstract Megagametophytes of Macrozamia communis were incubated in White's Basal Medium and in White's Basal Medium modified with 2,4-D and kinetin. On the medium enriched with growth substances, regeneration of coralloid roots was induced. These are morphologically identical to sporophytic coralloid roots, without any endosymbiont and displaying ...
Paolo De Luca +3 more
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Characterization of a symbiotic, heterocystous, N2-fixing cyanobacterium fromCycas coralloid roots
World Journal of Microbiology and Biotechnology, 1992A symbiotic, heterocystous, N2-fixing blue-green alga, isolated from the coralloid roots of a xerophytic plant,Cycas revoluta, grew best in liquid medium supplemented with 4 mM NO 3 (-) . Morphologically, the isolated alga was identical to that of the natural endophyte but the cell size had decreased markedly. The alga was heterotrophic.
A, Sharma, D P, Mishra, A, Kumar
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Akinete ultrastructure of Nostoc species isolated from cycad coralloid roots
Canadian Journal of Botany, 1980Nostoc strains isolated from different cycad coralloid roots were grown in culture until sporulation to study the structure and ultrastructure of akinetes. These cells have cell walls enclosed by two different envelopes produced by the vegetative cells during akinete differentiation, and cytoplasm containing thylakoids, cyanophycin granules ...
Maria Grilli Caiola, Luisa De Vecchi
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Phycologia, 1975
Abstract Cyanophyceae living in the coralloid-roots of the cycad Encephalartos altensteinii cultivated in the Botanical Gardens of Naples (Italy) and grown in culture have been studied by light and electron microscopy. The cells of the coralloids do not appear to be invaded by bacteria and the Cyanophyceae are localized in the intercellular spaces ...
Maria Grilli Caiola
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Abstract Cyanophyceae living in the coralloid-roots of the cycad Encephalartos altensteinii cultivated in the Botanical Gardens of Naples (Italy) and grown in culture have been studied by light and electron microscopy. The cells of the coralloids do not appear to be invaded by bacteria and the Cyanophyceae are localized in the intercellular spaces ...
Maria Grilli Caiola
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