scholarly journals Host Specificity In The Root Hair "Curling Factor" of Rhizobium Spp.

1969 ◽  
Vol 22 (2) ◽  
pp. 413 ◽  
Author(s):  
Phaik Y Yao ◽  
JM Vincent
Keyword(s):  
Medicago Sativa ◽  
Host Specificity ◽  
Root Hair ◽  
Root Zone ◽  
Root Hairs ◽  
Degree Of Deformation ◽  
Medicago Sativa L ◽  
Rhizobium Spp ◽  
Hair Curling ◽  
Root Hair Curling

Thirty-eight cultures of rhizobia and 10 non-rhizobia growing in the root zone of clover (Trifolium glomeratum L.), 5 rhizobia and 3 non-rhizobia in that of lucerne (Medicago sativa L.), and 8 rhizobia in that ofSiratro (Phaseolus atropurpureus DO.) revealed a specific relationship between bacteria and host that determined the kind and degree of deformation of the root hairs.

The nodDABC Genes of Rhizobium leguminosarum biovar trifolii Confer Root-Hair Curling Ability to a Diverse Range of Soil Bacteria and the Ability to Induce Novel Root Swellings on Beans

1994 ◽  
Vol 21 (3) ◽  
pp. 311 ◽  
Author(s):  
J Plazinski ◽  
RW Ridge ◽  
IA Mckay ◽  
MA Djordjevic
Keyword(s):  
Root Hair ◽  
Soil Bacteria ◽  
Rhizobium Leguminosarum ◽  
Plant Root ◽  
Root Hairs ◽  
Infection Threads ◽  
Wide Range ◽  
Hair Curling ◽  
Root Hair Curling ◽  
Rhizobium Leguminosarum Biovar Trifolii

Cloned DNA fragments coding for the nodDABC genes of Rhizobium leguminosarum biovar trifolii strain ANU843 were introduced into Rhizobium strains possessing Sym plasmid deletions. These strains were able to: (a) synthesise four butanol-soluble Nod metabolites; (b) affect the normal growth pattern of plant root hairs of a wide range of host and non-host legumes; and (c) induce many root outgrowths on Phaseolus plants. The four Nod metabolites produced by these strains were labelled by supplying cultures with 14C-acetate in the presence of a flavonoid inducer of nod gene expression. In contrast, more than ten Nod metabolites were synthesised by wild-type strains or constructed strains containing the full complement of R. leguminosarum biovar. trifolii nodulation and host specific nodulation genes. Strain ANU845 containing nodDABC did not induce infection threads or nodule initiation sites but distorted and curled cells in plant root hairs. However strain ANU845 induced root outgrowths on beans (Phaseolus vulgaris) that appeared to result from a proliferation of the epidermal tissue. Transfer of plasmids bearing nodDABC to various Gram-negative bacteria, Agrobacterium tumefaciens, Pseudomonas aeruginosa, Lignobacter sp., Azospirillum brasilense and Escherichia coli, and different non-nodulating mutant rhizobia conferred on these strains the ability to cause root-hair curling and distortions. Several strains induced root-hair curling on clover and a range of other non-host legumes. We suggest that the expression of nodDABC in a range of soil bacteria may extend or alter the effects of these soil bacteria on the roots of host plants.

scholarly journals Identification of a Rhizobium meliloti pSym2011 region controlling the host specificity of root hair curling and nodulation.

1985 ◽  
Vol 164 (3) ◽  
pp. 1200-1210 ◽  
Author(s):  
G Truchet ◽  
F Debellé ◽  
J Vasse ◽  
B Terzaghi ◽  
A M Garnerone ◽  
...  
Keyword(s):  
Host Specificity ◽  
Root Hair ◽  
Rhizobium Meliloti ◽  
Hair Curling ◽  
Root Hair Curling

Root hair infection and nodulation in lucerne (Medicago sativa L.) as influenced by salinity and alkalinity

1974 ◽  
Vol 40 (2) ◽  
pp. 261-268 ◽  
Author(s):  
M. Lakshmi-Kumari ◽  
C. S. Singh ◽  
N. S. Subba Rao
Keyword(s):  
Medicago Sativa ◽  
Root Hair ◽  
Root Hair Infection ◽  
Medicago Sativa L

Rhizobium nodulation genes involved in root hair curling (Hac) are functionally conserved

1985 ◽  
Vol 4 (2-3) ◽  
pp. 147-160 ◽  
Author(s):  
M. A. Djordjevic ◽  
P. R. Schofield ◽  
R. W. Ridge ◽  
N. A. Morrison ◽  
B. J. Bassam ◽  
...  
Keyword(s):  
Root Hair ◽  
Nodulation Genes ◽  
Hair Curling ◽  
Root Hair Curling ◽  
Rhizobium Nodulation

Studies on the Root Hair "Curling Factor" of Rhizobium

1970 ◽  
Vol 131 (4) ◽  
pp. 337-342 ◽  
Author(s):  
D. H. Hubbell
Keyword(s):  
Root Hair ◽  
Hair Curling ◽  
Root Hair Curling

Research Note: Boron deficiency affects early infection events in the pea-Rhizobium symbiotic interaction

2001 ◽  
Vol 28 (8) ◽  
pp. 819 ◽  
Author(s):  
Miguel Redondo-Nieto ◽  
Rafael Rivilla ◽  
Abdelaziz El-Hamdaoui ◽  
Ildefonso Bonilla ◽  
Luis Bolaños
Keyword(s):  
Gene Expression ◽  
Pisum Sativum ◽  
Cell Invasion ◽  
Root Hair ◽  
Boron Deficiency ◽  
Symbiotic Interaction ◽  
Pisum Sativum L ◽  
Plant Exudates ◽  
Hair Curling ◽  
Root Hair Curling

The effects of the deprivation of boron (B) on Rhizobium–legume signaling and preinfection events have been investigated in pea (Pisum sativum L. cv. Argona). The capacity of root exudates to induce the activity of nodulation genes was modulated by B nutrition in the host plant. Exudates derived from B-deficient pea plants led to a low level of nod-gene expression that could be correlated with poor root hair curling. However, inoculation of B-deficient plants with bacteria grown in the presence of the nod-gene inducing hesperetin, restored root hair curling. The attachment of bacteria to roots was also diminished in plants grown in the absence of the micronutrient, and it was not recovered by hesperetin. Both phenomena provoked a reduction in nodulation of more than 50%. Furthermore, infection thread development was arrested at very early stages, and cell invasion by endocytosis was precluded, leading to almost empty of bacteria B-deficient nodules.

Sign in / Sign up

Export Citation Format

Share Document