Root-nodule formation in non-leguminous angiosperms

Bond, G.

doi:10.1007/bf02661860

Cited by 36 publications

(42 citation statements)

References 12 publications

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“…1B, C). These morphological properties were consistent with those of Frankia-actinorhizal root nodules (Bond, 1976;Wall, 2000).…”

Section: Resultssupporting

confidence: 81%

Nitrogen Fixation in Seabuckthorn (Hippophae rhamnoides L.) Root Nodules and Effect of Nitrate on Nitrogenase Activity

一幾¹,

喜則²,

亘³

et al. 2007

J. Japan. Soc. Hort. Sci.

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Seabuckthorn (Hippophae rhamnoides L.) is a small fruit tree belonging to the family Elaeagnaceae. Because seabuckthorn fruit is rich in unsaturated fatty acids and vitamins, this plant has potential as a food and medicinal crop. Here, we focused on symbiotic nitrogen fixation that could aid in the cultivation of this species. Microscopic observations showed that seabuckthorn root nodules have a standard morphology characteristic of Frankiaactinorhizal root nodules. Under nitrogen-free conditions, seabuckthorn seedlings inoculated with a homogenate of root nodules grew normally, and the fresh weight of root nodules was positively correlated with plant growth. In the field, nitrogenase activity in root nodules was high from May to September, when air temperatures were high and photosynthesis was active. Inhibition of nitrogen fixation by nitrate has been well documented in the root nodules of legumes. Therefore, we investigated the effect of nitrate on nitrogenase activity in seabuckthorn root nodules. Nitrogenase activity in seabuckthorn root nodules was not inhibited by the addition of high concentrations (up to 30 mM) of nitrate over a short term (5 days), but was apparently inhibited by long-term (20-30 days) treatments with 5 and 10 mM of nitrate.

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“…1B, C). These morphological properties were consistent with those of Frankia-actinorhizal root nodules (Bond, 1976;Wall, 2000).…”

Section: Resultssupporting

confidence: 81%

Nitrogen Fixation in Seabuckthorn (Hippophae rhamnoides L.) Root Nodules and Effect of Nitrate on Nitrogenase Activity

一幾¹,

喜則²,

亘³

et al. 2007

J. Japan. Soc. Hort. Sci.

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“…growing in the Glasgow Botanic Gardens Preliminary evidence that the endophyte within the nodules resembled that in the nodules of Alnus and of some other non-legume genera, and that the nodules were nitrogenfixing was provided and was published in the appropriate I.B.P. volume (Bond, 1976a). Subsequently Medan and Tortosa (1976) reported that plants of C. paradoxa and of C. spinosissima Gmel.…”

Section: Introductionmentioning

confidence: 99%

ROOT NODULES IN THE GENUS COLLETIA

Bond

Becking²

1982

New Phytologist

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SUMMARYFollowing the earlier reported detection of root nodules on a species of Colletia growing in the Glasgow Botanic Gardens, the authors' enquiries have revealed that Colletta species are nodulated in some other botanic gardens, both in Europe and elsewhere. Cytological study of the nodules under the electron microscope shows that the endophyte is a procaryotic actmomycete-like organism consisting of septate, branching hyphae which are 0-37 to 0-53 fim in diameter and form terminal spherical vesicles 2-0 to 2-5 fim in diameter. The vesicles are internally sub-divided and lie peripherally within the host cell. The endophyte ,s enclosed withm a thin layer (or capsule) of material which judging by previous studies of other non-legume nodules consists of carbohydrate-related substances laid down by the host cytoplasm. Data froni long-term growth trials and acetylene assays show that Colletia nodules are nitrogen-fixing and capable of satisfying the nitrogen-needs of the host plant. Of the five genera of the Rhamnaceae that have so far been found to be nodule-bearing, four (namely Colletta, Dtscaria, Trevoa and Takuenea) are in the tribe Colletieae, while the fifth genus (Ceanothus) is placed elsewhere in the family by taxonomists. A very similar situation exists in the Rosaceae as regards the distribution of nodulating genera and species. It is concluded that in these families the habit of symbiosis with a nitrogen-fixing actinomycete probably arose, in some instances, prior to the establishment of now-existing genera, but in others at a later stage. This conclusion is consistent with the belief that nodule symbioses were initiated in an earlier era when plants in general were subject to nitrogen stress.

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“…Symbiotic nitrogen fixation (up to 300 kg ha-'year-') contributes much more than these two sources added together. 'Bond (1976'Bond ( , 1977. Bufns The quantities of fertilizers applied vary considerably from country to country.…”

Section: Nitrogen Inputsmentioning

confidence: 99%

Nitrogen Fixation: A Biotechnological Opportunity for Canadian Forestry

Chatarpaul¹,

Carlisle²

1983

The Forestry Chronicle

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Intensive harvesting and forest management systems will increase nitrogen and organic matter losses from forest soils, and there will be a need to manage the soils using both fertilizers and nitrogen-fixing techniques to maintain site productivity. Legumes and non-legumes with nitrogen-fixing symbioses can fix up to 300 kg ha−1 year−1 of nitrogen and provide soil organic matter, but poor soils will need fertilization to maintain the nitrogen-fixing process. There are many species and cultural techniques the forester can use, including green manuring and mixed stands, but carefully designed field trials are needed to solve cultural problems. In addition, there are many opportunities for genetic selection of both the trees and shrubs and the bacteria (actinomycetes) involved. Before the systems can be used effectively the operational foresters will need to be better informed about the soil biota and the interaction with site and vegetation. The development of nitrogen-fixing systems offers a biotechnological opportunity for Canadian foresters to increase tree yield while maintaining site productivity.

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Root-nodule formation in non-leguminous angiosperms

Cited by 36 publications

References 12 publications

Nitrogen Fixation in Seabuckthorn (Hippophae rhamnoides L.) Root Nodules and Effect of Nitrate on Nitrogenase Activity

Nitrogen Fixation in Seabuckthorn (Hippophae rhamnoides L.) Root Nodules and Effect of Nitrate on Nitrogenase Activity

ROOT NODULES IN THE GENUS COLLETIA

Nitrogen Fixation: A Biotechnological Opportunity for Canadian Forestry

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