Plant Genetic Approaches to Symbiotic Nodulation and Nitrogen Fixation in Legumes

Gresshoff, Peter M.; Delves, Angela

doi:10.1007/978-3-7091-6989-6_6

Cited by 46 publications

(41 citation statements)

References 160 publications

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“…If the green nodules we have observed in supernodulating Phaseolizs bean and the parent line are a sign of senescence, this is in sharp contrast to the report of Gresshoff and Delves (1987) …”

contrasting

confidence: 99%

EFFECTS OF Rhizobium INOCULUM CONCENTRATION STRAIN AND COMBINED NITROGEN ON GROWTH AND NODULATION OF A SUPERNODULATING COMMON BEAN AND ITS PARENT LINE

Buttery¹,

Park²,

Bernard³

et al. 1990

Can. J. Plant Sci.

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contrasting

confidence: 99%

EFFECTS OF Rhizobium INOCULUM CONCENTRATION STRAIN AND COMBINED NITROGEN ON GROWTH AND NODULATION OF A SUPERNODULATING COMMON BEAN AND ITS PARENT LINE

Buttery¹,

Park²,

Bernard³

et al. 1990

Can. J. Plant Sci.

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“…These return signals elicit root hair deformation, cortical cell division, and sometimes nodule formation by the legume (Hirsch et al 2001). The results have shown here support the previous conclusion (Gresshoff and Delves 1986) that the hypernodulation mutants lack some chemical signals which, when present, provide autoregulatory control over nodule number. It was concluded that hypernodulation expression by chemical signals of shoot is common among legumes species.…”

Section: Discussionsupporting

confidence: 89%

Nodulation and nitrogen fixation in interspecies grafts of soybean and common bean is controlled by isoflavonoid signal molecules translocated from shoot

Abd‐Alla¹

2011

PLANT SOIL ENVIRON

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Identification of common signals of nodulation control among legume species will facilitate progress in enhancing symbiotic nitrogen fixation of legumes in sustainable agriculture system. Grafting experiments between soybean and common bean were carried out to evaluate whether a common shoot signals control the expression of hypernodulation among the tow species. Grafting of a hypernodulating soybean mutant NOD1-3 shoots to three cultivars of normally nodulating common bean roots resulted in hypernodulation on roots of three tested cultivars of common bean. The shoot control of hypernodulation may be causally related to differential root isoflavonoid levels, which are also controlled by shoot factors. Isoflavonoid analysis from root extracts of grafted plants showed that NOD1-3 shoots had markedly higher root isoflavonoid concentrations in roots of both NOD1-3 and common bean cv. Adzuki compared with self-grafts of common bean Adzuki. Exogenous application of daidzein, genistein, coumestrol, glycitein and in combination at concentration of 10 µmol to the nutrient solution significantly increased the nodule numbers of common bean cv. Adzuki. Therefore, the control of hypernodulation expression by isoflavonoid signal molecules translocated from shoot is common among legume species.

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“…Nodulation is also severely restricted by the presence of nitrate in the soil (7). Our laboratory has recently isolated several soybean mutants with altered symbiotic features, including some tolerant to nitrate (nts3) which also supernodulate (3,4), and others which do not form any nodules (nod-) (1,8).…”

mentioning

confidence: 99%

Regulation of the Soybean-Rhizobium Nodule Symbiosis by Shoot and Root Factors

Delves

Mathews²,

Day³

et al. 1986

Plant Physiol.

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297

201

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The availability of soybean mutants with altered symbiotic properties allowed an investigation of the shoot or root control of the relevant phenotype. By means of grafts between these mutants and wild-type plants (cultivar Bragg and Williams), we demonstrated that supernodulation as well as hypernodulation (nitrate tolerance in nodulation and lack of autoregulation) is shoot controlled in two mutants (nts382 and nts ll6) belonging most likely to two separate complementation groups. The supernodulation phenotype was expressed on roots of the parent cultivar Bragg as well as the roots of cultivar Williams. Likewise it was shown that non-nodulation (resistance to Bradyrhizobium) is root controlled in mutant nod49. The shoot control of nodule initiation is epistatically suppressed by the non-nodulation, root-expressed mutation. These findings suggest that different plant organs can influence the expression of the nodulation phenotype.The development of N-fixing nodules on legume roots upon invasion of Rhizobium (or Bradyrhizobium) bacteria is subject to regulation by factors both external and internal to the plant host. In particular, the extent of nodulation is restricted by a process termed autoregulation, in which the formation ofnodules on one part of the root systemically inhibits subsequent nodule formation in other root regions (3,15). Nodulation is also severely restricted by the presence of nitrate in the soil (7). Our laboratory has recently isolated several soybean mutants with altered symbiotic features, including some tolerant to nitrate (nts3) which also supernodulate (3, 4), and others which do not form any nodules (nod-) (1, 8).Clearly nodulation is subject to control by plant factors; the sites of this control are unknown, although some experimentation has implicated shoot-root interactions (1 1-13). By means of grafts between these mutant and wild-type plants, we Table I were inoculated with B. japonicum strain USDA110 (approximately 107 bacteria per plant) and were cultured in 25 cm pots filled with vermiculite:sand mixture (1:2 ratio). Glasshouse temperatures were held between 14 and 30°C and incandescent 100 W bulbs extended the photoperiod to 16 h near summer conditions). The pots received 1.2 L of nutrient solution as described by Herridge (10) three times a week (Table I

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Plant Genetic Approaches to Symbiotic Nodulation and Nitrogen Fixation in Legumes

Cited by 46 publications

References 160 publications

EFFECTS OF Rhizobium INOCULUM CONCENTRATION STRAIN AND COMBINED NITROGEN ON GROWTH AND NODULATION OF A SUPERNODULATING COMMON BEAN AND ITS PARENT LINE

EFFECTS OF Rhizobium INOCULUM CONCENTRATION STRAIN AND COMBINED NITROGEN ON GROWTH AND NODULATION OF A SUPERNODULATING COMMON BEAN AND ITS PARENT LINE

Nodulation and nitrogen fixation in interspecies grafts of soybean and common bean is controlled by isoflavonoid signal molecules translocated from shoot

Regulation of the Soybean-Rhizobium Nodule Symbiosis by Shoot and Root Factors

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