Results 111 to 120 of about 932,613 (136)
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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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, Sérgio Sabato
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Nitrogen Fixation in the Coralloid Roots of Macrozamia communis L. Johnson [PDF]
Australian Journal of Biological Sciences, 1965 Coralloid roots of Macrozamia communis have been shown by the isotopic method to fix nitrogen when they contain the endophytic blue·green algae. Immature coralloid roots devoid of the endophyte did not fix nitrogen. Coralloid roots from glasshouse-grown plants fixed 2· 7 times as much nitrogen when illuminated than they did in the dark and the IfiN ...
F J Bergersen
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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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South African Journal of Botany, 1986 Thirty-three species of Encephalartos, which include all the known species indigenous to the Republic of South Africa, together with Stangeria eriopus, were found to form coralloid roots. In all cases, specimens were found in which the coralloid roots were infected with Cyanobacteria (blue-green algae) and these roots in all cases reduced acetylene to ...
N Grobbelaar
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The Cycad Coralloid Root: Is There Evidence for Plant-Microbe Coevolution?
Current Opinion in MicrobiologyCycads are survivors, ancient plants originating in the Carboniferous. We hypothesize that cycad resilience and recent diversification could be partially explained by their specialized coral-like (coralloid) roots and their microbiome and that these symbiotic partners are co-evolving.
Edder D. Bustos-Diaz
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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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Coralloid Root Systems in Plants showing Lime-induced Chlorosis
Nature, 1967LIME-INDUCED chlorosis is a well known nutritional disorder of species growing on calcareous soils. The overt symptoms are the development of interveinal chloroses, which are commonly more severe in young leaves. Only in severe cases are the veins themselves chlorotic.
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Antiviral Activity of Coralloid Root ofCycas revoluta Extract Against Some Viruses of Tomato Plant
Experientia, 1984Crude coralloid root extract ofCycas revoluta showed significant antiviral activity against viruses of the tomato plant (PVX, PVY, TMV, TAV and TRSV) when applied 24 h before virus inoculation, or when mixed with different virus inocula before virus inocultion, in hypersensitive and systemic hosts.
G. P. Rao +3 more
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