Cyanobionts from cycad coralloid roots

1996 ◽  
Vol 83 ◽  
pp. 331-346
Author(s):  
Maria Grilli Caiola
Keyword(s):  
Coralloid Roots

scholarly journals Draft Genome Sequence of the Nitrogen-Fixing and Hormogonia-Inducing CyanobacteriumNostoc cycadaeStrain WK-1, Isolated from the Coralloid Roots ofCycas revoluta

2018 ◽  
Vol 6 (7) ◽  
Author(s):  
Yu Kanesaki ◽  
Masaki Hirose ◽  
Yuu Hirose ◽  
Takatomo Fujisawa ◽  
Yasukazu Nakamura ◽  
...  
Keyword(s):  
Host Plant ◽  
Genome Sequence ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Whole Genome Sequence ◽  
Whole Genome ◽  
Nitrogen Fixing ◽  
Coralloid Roots ◽  
Cycas Revoluta

ABSTRACTWe report here the whole-genome sequence ofNostoc cycadaestrain WK-1, which was isolated from cyanobacterial colonies growing in the coralloid roots of the gymnospermCycas revoluta. It can provide valuable resources to study the mutualistic relationships and the syntrophic metabolisms between the cyanobacterial symbiont and the host plant,C. revoluta.

The Predominance of Proteobacteria and Cyanobacteria in the Cycas dolichophylla Coralloid Roots Revealed by 16S rRNA Metabarcoding

Microbiology ◽  
2021 ◽  
Vol 90 (6) ◽  
pp. 805-815
Author(s):  
Y. Zheng ◽  
T.-Y. Chiang ◽  
Ch-Li Huang ◽  
X.-Y. Feng ◽  
K. Yrjälä ◽  
...  
Keyword(s):  
16S Rrna ◽  
Coralloid Roots

Polyphasic approach identifies two new species of Desmonostoc (Nostocales, Cyanobacteria) in the coralloid roots of Cycas fairylakea (Cycadales)

Phycologia ◽  
2021 ◽  
pp. 1-16
Author(s):  
Melissa H. Pecundo ◽  
Fangfang Cai ◽  
Aimee Caye G. Chang ◽  
Hai Ren ◽  
Nan Li ◽  
...  
Keyword(s):  
New Species ◽  
Polyphasic Approach ◽  
Two New Species ◽  
Coralloid Roots

scholarly journals Cycad Coralloid Roots Contain Bacterial Communities Including Cyanobacteria andCaulobacterspp. That Encode Niche-Specific Biosynthetic Gene Clusters

2018 ◽  
Vol 11 (1) ◽  
pp. 319-334 ◽  
Author(s):  
Karina Gutiérrez-García ◽  
Edder D Bustos-Díaz ◽  
José Antonio Corona-Gómez ◽  
Hilda E Ramos-Aboites ◽  
Nelly Sélem-Mojica ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Gene Clusters ◽  
Biosynthetic Gene ◽  
Biosynthetic Gene Clusters ◽  
Coralloid Roots

scholarly journals N2-Fixation by Freshly Isolated Nostoc from Coralloid Roots of the Cycad Macrozamia riedlei (Fisch. ex Gaud.) Gardn.

1991 ◽  
Vol 95 (3) ◽  
pp. 753-759 ◽  
Author(s):  
Peter Lindblad ◽  
Craig A. Atkins ◽  
John S. Pate
Keyword(s):  
N2 Fixation ◽  
Coralloid Roots

scholarly journals Nitrogen Fixation in the Coralloid Roots of Macrozamia Communis L. Johnson

1965 ◽  
Vol 18 (6) ◽  
pp. 1135 ◽  
Author(s):  
FJ Bergersen ◽  
GS Kennedy ◽  
W Wittmann
Keyword(s):  
Nitrogen Fixation ◽  
Green Algae ◽  
Intact Plant ◽  
Large Excess ◽  
Fixed Nitrogen ◽  
Blue Green Algae ◽  
Plant Parts ◽  
Isotopic Method ◽  
Coralloid Roots

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 excess was about equally divided between fractions soluble or insoluble in 3N HCI. Coralloid roots excavated from beneath large fieldgrown plants were opaque and did not fix more nitrogen when illuminated than they did in the dark. Most of the newly fixed nitrogen was found in the buffered sucrose extract of crushed tissue. When an intact plant bearing coralloid roots was exposed to an atmosphere containing a large excess of IfiN. for 48 hr the IfiN was found to be distributed through the plant parts. Nitrogen fixed in the coralloid roots is thus available for the growth of the plant. The coralloid roots evolved small amounts of hydrogen.

Symbiotic Nitrogen Fixation by Coralloid Roots of the Cycad Macrozamia riedlei: Physiological Characteristics and Ecological Significance

1976 ◽  
Vol 3 (3) ◽  
pp. 349 ◽  
Author(s):  
J Halliday ◽  
JS Pate
Keyword(s):  
Nitrogenase Activity ◽  
Natural Habitat ◽  
Natural Populations ◽  
Molar Ratio ◽  
Fixation Rate ◽  
Plant Nitrogen ◽  
Blue Green Algae ◽  
C2h2 Reduction ◽  
Whole Plant ◽  
Coralloid Roots

'Coralloid' roots containing blue-green algae occur commonly on the upper root stocks of M. riedlei in natural habitat in Western Australia. Each coralloid mass persists for several seasons; replacement sets form at irregular intervals, especially after fire. 15N2 and acetylene reduction assays demonstrate that coralloid roots fix nitrogen at physiologically significant rates. C2H2 reduction rates by coralloid roots are higher in winter than in summer. Performance is positively correlated with rainfall; soil temperature appears to be of lesser importance. Diurnal fluctuations in nitrogenase activity occur. Calibration using 15N2 gives a molar ratio of C2H2 reduced : N2 fixed of 5.8 : 1. The seasonal average of C2H2 reduction of 14.8 nmol per g fresh wt coralloid root per min is then equivalent to 37.6 g N per kg fresh wt per year, a fixation rate potentially capable of doubling coralloid root nitrogen once in every 8 weeks, and whole plant nitrogen every 8-11 years. Returns of fixed nitrogen in two natural populations of Macrozamia are estimated by compounding measurements of biomass of host and symbiotic organs with the seasonal average for coralloid fixation rate. The values obtained (18.8 and 18.6 kg N ha-1 year-1) indicate that Macrozamia contributes significantly to the nitrogen economy of its ecosystem.

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