Grasslands NuSiral white clover (Trifolium repens L.)

2002 ◽  
Vol 42 (7) ◽  
pp. 1023 ◽  
Author(s):  
J. F. Ayres ◽  
L. A. Lane ◽  
J. R. Caradus ◽  
P. T. P. Clifford
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Summer Rainfall ◽  
Moisture Stress ◽  
Annual Rainfall ◽  
Winter Rainfall ◽  
Mild Winter ◽  
Winter Activity ◽  
Trifolium Repens L ◽  
Cattle And Sheep

Grasslands NuSiral is a medium–large-leaf white clover (Trifolium repens L.) cultivar with intermediate growth habit (midway between open and erect and dense and prostrate), early flowering maturity and high growing point density. G. NuSiral possesses the plant-type attributes known to be desirable for broad adaptation to dryland pasture conditions in Australia and has been developed for cattle and sheep pastures in both summer rainfall and winter rainfall areas where average annual rainfall exceeds 750 mm. G. NuSiral is expected to provide enhanced stolon survival and autumn recovery in environments where summer moisture stress is present but not intense, and winter growth comparable to cv. Haifa where mild winter conditions allow the expression of G. NuSiral's winter activity.

Grasslands Trophy — a new white clover (Trifolium repens L.) cultivar with tolerance of summer moisture stress

2007 ◽  
Vol 47 (1) ◽  
pp. 110 ◽  
Author(s):  
J. F. Ayres ◽  
J. R. Caradus ◽  
R. D. Murison ◽  
L. A. Lane ◽  
D. R. Woodfield
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Leaf Size ◽  
Moisture Stress ◽  
Yield Potential ◽  
Annual Rainfall ◽  
Progeny Testing ◽  
Eastern Australia ◽  
Trifolium Repens L

A breeding project has developed a new synthetic white clover (Trifolium repens L.) cultivar, Grasslands Trophy, that possesses tolerance of summer moisture stress in dryland pasture environments in the 850–1250 mm average annual rainfall temperate perennial pasture zone in eastern Australia. The breeding strategy used to develop Grasslands Trophy was an in situ breeding cycle for: (i) identifying and selecting superior genotypes, (ii) crossing elite germplasm and (iii) progeny testing derived breeding lines for the expression of key agronomic and grazing value traits. The primary selection criteria were early vigour, herbage yield, persistence and seed yield potential. Parental selection was also applied for seed yield, uniformity of leaf size, uniform flowering pattern and freedom from disease and virus symptoms. Grasslands Trophy is medium–large in leaf size with stable leaf size, combines intermediate stolon density with intermediate stolon thickness, and expresses high stolon survival and strong autumn regrowth following summer moisture stress. Grasslands Trophy has mid-season flowering maturity, intensive flowering prolificacy and high seed yield capability. Agronomic results from trials in northern New South Wales and New Zealand indicate that Grasslands Trophy has broad adaptation, expresses high summer and winter growth activity, and is reliably persistent for at least 4 years.

Factors affecting the hydrogen cyanide potential of white clover (Trifolium repens L.)

1987 ◽  
Vol 38 (6) ◽  
pp. 1053 ◽  
Author(s):  
PJ Vickery ◽  
JL Wheeler ◽  
C Mulcahy
Keyword(s):  
Light Intensity ◽  
White Clover ◽  
Trifolium Repens ◽  
Dry Matter ◽  
Late Pregnancy ◽  
Moisture Stress ◽  
Early Spring ◽  
Cool Temperature ◽  
Trifolium Repens L ◽  
Phosphorus Application

Pot experiments were used to determine the effects of age, light, temperature, mineral nutrition and wilting on the HCN potential (HCNp ) of white clover (Trifolium repens L.). HCNp, adjusted for pre-expenmental HCNp, was reduced by higher light intensity (505 v. 220 mg HCN kg-1 DM), by increased temperature (408 v. 317 mg HCN kg-1 DM) and by phosphorus application (382 v. 343 mg HCN kg-1 DM). These effects were largely explained by the hypothesis that HCNp diminished as the size and vigour of the plant increased, and the use of dry matter production as a covariate on HCNp removed the significant effects of light, temperature and phosphorus. In two experiments wilting plants prior to harvest increased HCNp by 15 and 24%, and reduced dry matter yield by 9 and 13%. HCNp declined curvilinearly as the white clover aged. The conditions shown to favour high HCNp, namely, immaturity, moisture stress, low light intensity, cool temperature, and inadequate P supply, are those which occur periodically in the late autumn and early spring of temperate climates. Sheep in late pregnancy at this time, could, if white clover comprises a substantial proportion of their diet, experience thiocyanate absorption as a consequence of HCN detoxication and hence increase the risk of goitri to the lamb.

scholarly journals ADAPTATION OF WHITE CLOVER TO MOISTURE STRESS

1987 ◽  
pp. 143-149 ◽  
Author(s):  
D.R. Woodfield ◽  
J.R. Caradus
Keyword(s):  
Plant Breeding ◽  
White Clover ◽  
Trifolium Repens ◽  
Moisture Stress ◽  
Root Characteristics ◽  
Trifolium Repens L ◽  
Selection For

In a series of four experiments, the w-seeding ability and shoot and root characteristics of dryland white clover populations (Trifolium repens L.), and the effect of selection for root characteristics within white clover were examined. There was little evidence that dryland populations were better at re-seeding than Huia, but dryland populations were more taprooted than populations collected from moister environments. Root morphologies of dryland populations were similar to that of Huia but were smaller leaved, although not as small leaved as Tahora. Evidence that selection for more taprooted, smaller-leaved types of white clover would be successful is also presented. Keywords: root type, drought, re-seeding, plant breeding, survival

scholarly journals Response to selection for increased taproot diameter

1996 ◽  
Vol 6 ◽  
pp. 141-143
Author(s):  
D.R. Woodfield ◽  
J.R. Caradus ◽  
G.R. Cousins ◽  
T. Dunn
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Growth Habit ◽  
Leaf Size ◽  
Moisture Stress ◽  
Response To Selection ◽  
Short Term ◽  
Grazing Systems ◽  
Trifolium Repens L ◽  
Selection For

Increased taproot diameter is an important component in maintaining white clover (Trifolium repens L.) growth, nitrogen fixation and persistence during short-term moisture stress. Previous reports indicated selection for large taproot diameter would result in commensurate increases in leaf size and poorer growth habit. The current research investigates the response to selection for taproot diameter and the association between taproot diameter and leaf size in large-leaved clovers suited to dairy grazing systems. Taproot diameter increased by 2.4% per cycle while leaf size and growth habit were not significantly altered. Furthermore, while taproot diameter did not increase between cycle 2 and 3, the root index which measures the ratio of taproot diameter to leaf size increased linearly across all three cycles. These results suggest it is possible to select white clovers for dairying which have larger taproot diameter while maintaining a suitable growth habit. Keywords: dairying, drought, genetic improvement, root morphology, Trifolium repens L., white clover,

The pastoral significance, adaptive characteristics, and grazing value of white clover (Trifolium repens L.) in dryland environments in Australia: a review

2000 ◽  
Vol 40 (7) ◽  
pp. 1033 ◽  
Author(s):  
L. A. Lane ◽  
J. F. Ayres ◽  
J. V. Lovett
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Germplasm Conservation ◽  
Moisture Stress ◽  
Cattle Grazing ◽  
Poor Survival ◽  
Cold Environments ◽  
Economic Significance ◽  
Trifolium Repens L ◽  
Pasture Legume

The importance of white clover as a pasture legume of international significance has led to major investment in research on ecophysiology, germplasm conservation, and white clover improvement. Despite the agronomic merit and economic significance of white clover, Australia lacks white clover cultivars that possess adaptive characteristics for persistence in mixed swards under sheep and cattle grazing. The major problem with contemporary white clover cultivars is that clover biomass fluctuates widely from year to year. This lack of reliability, particularly in dryland environments, is largely due to poor survival during summer moisture stress that is common to much of the Australian white clover zone. Factors such as edaphic constraints, intolerance of grass competition and close grazing, and lack of winter growth in cold environments also influence the contribution of white clover to pasture performance. This paper considers the mechanisms of regeneration, adaptive characteristics, and significance of white clover for animal production, and reflects on breeding objectives for white clover improvement.

Occurrence of alfalfa mosaic, clover yellow vein, subterranean clover red leaf, and white clover mosaic viruses in white clover throughout Australia

1998 ◽  
Vol 49 (4) ◽  
pp. 723 ◽  
Author(s):  
M. R. Norton ◽  
G. R. Johnstone
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Subterranean Clover ◽  
Yellow Vein ◽  
Enzyme Linked Immunosorbent Assay ◽  
Winter Rainfall ◽  
Field Samples ◽  
Trifolium Repens L ◽  
Compound Interest ◽  
Significant Spread

The levels of infection with 4 viruses in young white clover (Trifolium repens L.) plots sown in 1991 or 1992 were monitored at a total of 17 sites across the 6 States of Australia. Tests were undertaken for alfalfa mosaic (AMV), clover yellow vein (ClYVV), subterranean clover red leaf (SCRLV) (syn. soybean dwarf), and white clover mosaic (WClMV) viruses on field samples of 17 different cultivars, plus a local naturalised ecotype at each location, twice yearly over 3 years. The tests were undertaken using double antibody sandwich enzyme-linked immunosorbent assay (DASELISA). AMV and WClMV were the most common and widespread viruses. They infected plants atmany sites soon after establishment and then rapidly increased to high levels, occasionally exceeding 90% of plants. In contrast, at some sites, no infection with these viruses was detected. Analysis of the infection data at 4 sites, where significant spread of AMV occurred, indicated that the epidemics developed like compound interest models. Tests for SCRLV were done only in 1994 when moderate levels of infection were found at most southern, winter-rainfall dominant sites. The occurrence o fClYVV was sporadic and infection levels were always low.

Cytology of Pseudo‐Self‐Compatibility in Ladino White Clover, Trifolium repens L. 1

Crop Science ◽  
1963 ◽  
Vol 3 (5) ◽  
pp. 430-433 ◽  
Author(s):  
Maimon M. Cohen ◽  
R. C. Leffel
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Self Compatibility ◽  
Trifolium Repens L

An SSR and AFLP molecular marker-based genetic map of white clover (Trifolium repens L.)

Plant Science ◽  
2003 ◽  
Vol 165 (3) ◽  
pp. 531-539 ◽  
Author(s):  
Elizabeth S. Jones ◽  
Leonie J. Hughes ◽  
Michelle C. Drayton ◽  
Michael T. Abberton ◽  
Terry P.T. Michaelson-Yeates ◽  
...  
Keyword(s):  
Molecular Marker ◽  
Genetic Map ◽  
White Clover ◽  
Trifolium Repens ◽  
Trifolium Repens L
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