Spelling suggestions: "subject:"rhizobium leguminosas"" "subject:"rhizobium leguminosa""
1 |
Ecological and molecular studies on rhizobial rhizopines /Heinrich, Keith. January 1999 (has links) (PDF)
Thesis (Ph.D)--University of Adelaide, Dept. of Crop Protection, 1999. / Corrigendum attached to back cover. Includes bibliographical references (leaves 160-190).
|
2 |
Population genetic structure and ecology of Rhizobium leguminosarumStrain, Steven R. 12 October 1993 (has links)
Graduation date: 1994
|
3 |
Ecological and molecular studies on rhizobial rhizopinesHeinrich, Keith. January 1999 (has links) (PDF)
Corrigendum attached to back cover. Includes bibliographical references (leaves 160-190). Investigates the role of rhizopines in rhizobial competition for nodulation, and to isolate the rhizopine synthesis genes in Rhizobium leguminosarum bv. viciae.
|
4 |
Symbiotic characteristics of Rhizobium leguminosarum bv. trifolii recovered from nodules of field-grown Trifolium subterraneum L.Wanjagi, Francis Ndung'u 27 January 1992 (has links)
In a series of greenhouse experiments, isolates representing serotypically
distinct subpopulations of Rhizobium leguminosarum bv. trifolii recovered from root
nodules of field-grown subclover Trifolium subterraneum cv. "Nangeela"), were
evaluated for their symbiotic effectiveness potential, their effect on regrowth
potential of subclover, and for their competitive abilities to form nodules. Isolates
from the nodule dominant serotypes AS6, AS6-21, and AS21 were shown to be
suboptimally effective at fixing nitrogen gas (N₂) relative to RT162X95, a highly
effective commercial inoculant strain. Although the majority of isolates
representing the minor nodule occupying serotypes AS27, AG4, and AP17 were
also shown to be of moderate effectiveness, isolates ADS14 and RW11 of
serotype AS27 were equally as effective as RT162X95. Subclover regrowth was
influenced by the severity of the first harvest. Plant-isolate combinations
possessing superior N₂-fixing capabilities were more adversely affected by severe
clipping than were the less effective combinations. Isolate 88FL3,5, a mediocre
N₂-fixing member of the nodule dominant serotype AS6, was not universally more
competitive at forming nodules than other isolates. Although 88FL3,5 formed more
nodules than many of the other isolates when mixed in equal numbers with each
of them separately, isolates ADS14 and ADS16 significantly outcompeted 88FL3,5
even though they represented a minor nodule occupying serotype, AS27. The
nodule occupying successes of 88FL3,5 or ADS16 could be overcome if their
respective competitor had a numerical advantage ranging between 10:1 and 25:1.
Since the soil-borne population of 88FL3,5 has been shown to outnumber other
subpopulations of rhizobia in the same soil by at least 10:1, it is not surprising that
it can occupy the majority of nodules on field-grown plants even in the presence
of more competitive types. Why the highly effective and highly competitive
members of serotype AS27 are rarely recovered from nodules of field-grown
Trifolium subterraneum L. is a question that merits further study. / Graduation date: 1992
|
5 |
Symbiotic and saprophytic characteristics of a soil population of Rhizobium leguminosarum bv. trifoliiYap, Kathryn H. M. 12 July 1991 (has links)
Although much has been learned about the comparative
nodulating behavior of simple mixtures of rhizobial strains
under non-soil situations, it is unclear how these findings
relate to the factors influencing nodulation success by the
complex mixtures of strains found within soil-borne
rhizobial populations. Information on the structure and
physiological behavior of soil populations is almost nonexistent.
To achieve a better understanding of the situation
in soil, studies were carried out with the following
objectives. (i) To delineate by serological analysis the
population composition of nodule occupants of Rhizobium
leguminosarum bv.trifolii recovered from a variety of annual
and perennial clover (Trifolium) species planted into Abiqua
soil. (ii) To further the development of an assay to
evaluate the substrate responsiveness of specific indigenous
serotypes of R. leguminosarum bv. trifolii while they reside
within the soil microbial community. Immunodiffusional
analysis of isolates recovered from nodules of five annual
(T. subterraneum, T. incarnatum, T. vesiculosum, T.
parviflorum, T. patens) and three perennial (T. pratense, T.
repens, T. hybridum) species of clover revealed that the
serotypic composition of the natural population of R.
leguminosarum bv. trifolii in Abiqua soil is almost
completely known. With antisera to 14 antigenically distinct
serotypes at our disposal, only 19 of 272 isolates recovered
from these eight clover species were antigenically unknown.
While the perennial species showed no pronounced preference
for particular serotypes, a substantial proportion (37-75%)
of nodule occupants from each of the annual clovers (with
the exception of T. vesiculosum) reacted with antiserum AS6.
These isolates could be subdivided by their serological
reactions of non-identity with either antisera AS6, AS27, or
both antisera AS21 and AS27. Using multi-locus allozyme
electrophoresis (MLAE) to analyze population structure
within serotypes, isolates representing serocluster AS6 were
found to be rooted at a similarity of 0.82 and clustered
with the other three serotypes (AG4, AS21, and AS27) only at
a similarity of 0.37. In contrast to AS6, MLAE analysis
revealed that "genotypic distances" between the 7 ETs
representing AG4 could be large. The chapter on the
nalidixic acid cell-elongation assay only represents the
second report of its use on soil microbial populations.
Nalidixic acid was found to be the most suitable DNA gyrase
inhibitor for rhizobial studies since norfloxacin and
ciprofloxacin at extremely low concentrations (2.0 and 0.5
mg/l, respectively) reduced the proportion of elongating
cells significantly. In contrast to other indigenous
serotypes, the majority of members of serotype AR23 did not
elongate in response to yeast extract (YE). Regardless of
nutrient type, or concentration, the percentage of elongated
cells of AR23 remained low (<16%) even after 24 h of
incubation. While the cell elongation response of serotype
AS6 occured more rapidly to YE than did AR23, a less
vigorous response by AS6 was observed when other nutrient
sources were used. The appearance of elongated cells was
delayed and the final percentage of elongated cells was
reduced. / Graduation date: 1992
|
6 |
Structure and function of cellulose fibers and lectins in Rhizobium leguminosarum and regulation of their synthesis /Ausmees, Nora. January 2001 (has links)
Thesis (Ph. D.)--Swedish University of Agricultural Sciences, 2001. / Includes bibliographical references.
|
7 |
Molecular biology of rhizopine genes in Rhizobium leguminosarum br. viciae / Masoud Bahar.Bahar, Masoud January 1997 (has links)
Bibliography: leaves 101-121. / vii, 122, [77] leaves, [21] leaves of plates : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Reports the characterisation of mos genes and preliminary studies on the mos genes in R. leguminosarum br. viciae strain 1a. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1998?
|
8 |
Ecological and molecular studies on rhizobial rhizopines / Keith Heinrich.Heinrich, Keith January 1999 (has links)
Corrigendum attached to back cover. / Includes bibliographical references (leaves 160-190). / x, 190, [20] leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates the role of rhizopines in rhizobial competition for nodulation, and to isolate the rhizopine synthesis genes in Rhizobium leguminosarum bv. viciae. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1999
|
9 |
Ecological and molecular studies on rhizobial rhizopines / Keith Heinrich.Heinrich, Keith January 1999 (has links)
Corrigendum attached to back cover. / Includes bibliographical references (leaves 160-190). / x, 190, [20] leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates the role of rhizopines in rhizobial competition for nodulation, and to isolate the rhizopine synthesis genes in Rhizobium leguminosarum bv. viciae. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1999
|
10 |
Ecology of a soil population of Rhizobium leguminosarum bv. trifoliiLeung, Kam-tin 01 September 1992 (has links)
Graduation date: 1993
|
Page generated in 0.0642 seconds