The effect of white clover mosaic virus on nodulation of white clover (Trifolium repens L. cv. Ladino)

1980 ◽  
Vol 31 (2) ◽  
pp. 307 ◽  
Author(s):  
P Guy ◽  
A Gibbs ◽  
K Harrower
Keyword(s):  
Virus Infection ◽  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Repens ◽  
Effective Strain ◽  
Plant Weight ◽  
Trifolium Repens L ◽  
White Clover Mosaic Virus ◽  
Infected Nodule ◽  
Mosaic Virus Infection

White clover mosaic virus infection of Ladino clover seedlings resulted in decreased plant weight and a 71 % decrease in the number of nodules per plant without the decrease in nodule size which is usually observed when legumes are virus-infected. Nodule numbers decreased both on plants nodulated with an effective strain and on those with an ineffective strain of Rhizobium.

Effect of white clover mosaic virus infection on various processes relevant to symbiotic N2 fixation in red clover

1984 ◽  
Vol 62 (1) ◽  
pp. 38-43 ◽  
Author(s):  
A. H. Khadhair ◽  
R. C. Sinha ◽  
J. F. Peterson
Keyword(s):  
Virus Infection ◽  
Mosaic Virus ◽  
White Clover ◽  
Nitrogenase Activity ◽  
Reductase Activity ◽  
Red Clover ◽  
Flower Senescence ◽  
Root Weight ◽  
White Clover Mosaic Virus ◽  
Mosaic Virus Infection

The effect of white clover mosaic virus infection on several factors relevant to symbiotic N2 fixation was determined in nodulated red clover (Trifolium pratense L.) plants at 10-leaf, preblooming, blooming, and flower-senescence stages of growth, corresponding to 3, 6, 9, and 12 weeks after virus inoculation, respectively. Virus infection caused a significant [Formula: see text] reduction of plant growth (top and root weight), nodulation (number and weight of nodules), rhizobial population, nitrogenase activity, and leghemoglobin concentration in the nodules. The presence of a high concentration of virus within nodules at all harvest times was indicated by infectivity assays. The leghemoglobin was shown to be localized in the peribacteroidal space by a cytochemical technique. A significant increase in inducible nitrate reductase activity was associated with virus infection of plants.

The effects of white clover mosaic virus infection on the yield of red clover (Trifolium pratense L.) in mixtures and in pure stands

1982 ◽  
Vol 98 (2) ◽  
pp. 455-460 ◽  
Author(s):  
S. W. Scott
Keyword(s):  
Virus Infection ◽  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Pratense ◽  
Red Clover ◽  
Trifolium Pratense L ◽  
White Clover Mosaic Virus ◽  
Different Levels ◽  
Negative Linear Relationship ◽  
Mosaic Virus Infection

SUMMARYThe effects of white clover mosaic virus infection on the yield of two red clover varieties grown alone and in mixtures with either perennial or hybrid ryegrasses were examined. The spread of this virus within the pure clover plots was rapid. Clover drymatter yields were reduced and these losses were greater in the grass–clover mixtures than in the pure clover plots. Reductions in yield of about 70% were recorded at the first cut in mixtures of Sabtoron and Sabrina. The response of the clover to different levels of virus infection was best described by a negative linear relationship.Yields of Sabrina hybrid ryegrass increased as the levels of virus infection in the clover increased. This compensated for the losses in yield of the legume, leaving total sward yields unaffected by the virus.

Highways for internal virus spread: patterns of virus movement in the stoloniferous herb Trifolium repens

Botany ◽  
2011 ◽  
Vol 89 (8) ◽  
pp. 573-579 ◽  
Author(s):  
Tamara van Mölken ◽  
Thomas Sundelin ◽  
Reinier Snetselaar ◽  
Josef F. Stuefer
Keyword(s):  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Repens ◽  
Resource Sharing ◽  
Clonal Growth ◽  
Physiological Integration ◽  
Disease Development ◽  
Virus Spread ◽  
Leaf Ontogeny ◽  
White Clover Mosaic Virus

Resource sharing between connected ramets can be advantageous for clonal plants. However, widespread vascular integration bears the risks of enhanced internal pathogen spread, which may be one of the most prominent disadvantages of clonal growth. In this paper we analyzed patterns of internal virus spread in ramet groups of the stoloniferous herb Trifolium repens L. (white clover) and investigated the effect of leaf ontogeny on intraclonal disease development. We inoculated single leaves of T. repens with White clover mosaic virus and analyzed the infection status of ramets at different distances from the point of infection and in leaves from different developmental stages. White clover mosaic virus infected all young developing plant parts positioned on basal branches or on the main stolon. Leaf ontogeny strongly affected disease development, and fully mature leaves on the main stolon remained virus free. The pattern of plant-internal virus spread was not affected by heterogeneous light conditions. Despite the well-described advantages of physiological integration, our data suggest that clonal integration may lead to negative selection pressures on clonal growth in pathogen-prone environments.

scholarly journals First Report of White clover mosaic virus on White Clover (Trifolium repens) in Korea

Plant Disease ◽  
2017 ◽  
Vol 101 (8) ◽  
pp. 1559-1559 ◽  
Author(s):  
C. Y. Park ◽  
S.-H. Lee ◽  
S. Lim ◽  
J. S. Moon ◽  
B.-S. Kim
Keyword(s):  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Repens ◽  
First Report ◽  
White Clover Mosaic Virus

Development and validation of protocols for product stewardship in transgenic white clover (Trifolium repens L.): detection of the AMV CP and npt2 transgenes in seeds, herbage and hay

2015 ◽  
Vol 66 (10) ◽  
pp. 1039 ◽  
Author(s):  
S. Panter ◽  
A. Mouradov ◽  
K. F. Smith ◽  
G. Spangenberg
Keyword(s):  
Mosaic Virus ◽  
White Clover ◽  
Trifolium Repens ◽  
Alfalfa Mosaic Virus ◽  
Natural Forms ◽  
Viral Coat ◽  
Ryegrass Hay ◽  
Trifolium Repens L ◽  
Coat Protein Mediated Resistance ◽  
Development And Validation

White clover (Trifolium repens L.) is an important pasture legume in temperate areas throughout the world, providing fodder for grazing animals and improving soil fertility via symbiotic nitrogen fixation. However, the persistence and stress tolerance of white clover is affected by several viruses, chiefly Alfalfa mosaic virus (AMV), Clover yellow vein virus (ClYVV) and White clover mosaic virus (WClMV). Efforts to introgress natural forms of virus resistance from other Trifolium spp. into white clover and lucerne (alfalfa) have had only limited success. This has been addressed by developing white clover germplasm exhibiting viral-coat-protein-mediated resistance to AMV and non-transgenic resistance to ClYVV. This report describes PCR-based assays for detecting the transgenes associated with the H6 transformation event in seeds, fresh leaves, air-dried leaves and mixtures of air-dried herbage of white clover and perennial ryegrass (hay). Although further development is required to convert these assays for use in the field, this paper demonstrates the ability to detect these transgenes in a range of agricultural products associated with the commercial use of white clover.

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