Response to phosphorus of a world collection of white clover cultivars

Mackay, A. D.; Caradus, J. R.; Dunlop, James; Wewala, G. S.; Mouat, M. C. H.; Lambert, M. G.; Hart, A. L.; Bosch, J. Van Den

doi:10.1007/978-94-009-2053-8_76

Cited by 14 publications

(17 citation statements)

References 4 publications

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“…Seven of the 12 cultivars with the lowest root/shoot ratio also had the lowest root dry weight, while six of the high root/shoot ratio cultivars were in the group with the highest root dry weights. Differences among cultivars for shoot characters have been documented previously (Mackay et al, 1990). Gourley et al (1993) observed no significant difference among white clover cultivars, 'Gandalf, 'Haifa', "El Lucero', 'Pronitro', 'Huia', and 'Clarence' for root/shoot ratio.…”

Section: Results and Discussion Comparison Of Cultivarsmentioning

confidence: 74%

“…A collection of 112 white clover cultivars and seven breeding lines from 25 countries was grown to conrrje shoot growth response to added P (Mackay et al, 1990). Pregerminated seed was sown in sand and grown for 10 days before transplanting into pots.…”

Section: Methodsmentioning

confidence: 99%

“…RatioRoot/shoot ratio was unrelated to the clusters based on P response functions used previously by Mackay et al (1990) to describe the P response of the cultivars. No significant difference was found among these clusters for root/shoot ratio calculated at any single P level or meaned over all P levels ( Table 5).…”

Section: Relationship Between Phosphorus Response and Root/shootmentioning

confidence: 99%

“…Intraspecific variation for shoot dry matter response to added P has been described for a collection of white clover cultivars and breeding lines (Mackay et al, 1990). The aim of the present study was to determine the influence of P nutrition on partitioning of dry matter between root and shoot of this collection and the effect of differences in partitioning between root and shoot on shoot response to fertilizer P. The allocation of dry matter between root and shoot can be viewed as either an instantaneous measure (root dry matter/shoot dry matter) or as a function of total plant size and age using allometric analysis (Gould, 1966).…”

Section: Introductionmentioning

confidence: 99%

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Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

Caradus

Mackay

Dunlop

et al. 1995

Journal of Plant Nutrition

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Root dry weight and the relationship between shoot and root characteristics for 119 white clover (Trifolium repens L.) cultivars and breeding lines were examined at five (40, 120, 200, 400, and 500 mg P/kg soil) phosphorus (P) levels. There were significant (P<0.01) differences among cultivars for root dry weight and root/shoot ratio. Instantaneous root/shoot ratio decreased with increasing P supply up to 200 mg P/kg, and then increased again from 400 to 500 mg P/kg soil. Allometric analysis indicated that root growth relative to shoot growth increased with increasing P supply. There was a significant (P<0.01) cultivar x P level interaction such that for the cultivars, the root/shoot ratio was either unaffected, increasing, or decreasing with increasing level of P supply. However, root/shoot ratio appeared to be unrelated to the functions used to describe the P response of the 119 cultivars studied. Shoot characters such as dry weight, leaf number, and stolon length were most closely correlated with root dry weight at the moderately low P levels of 120 and 200 mg added P/kg, where average P response was 9 and 24% of yields at 500 mg P/kg soil, respectively, rather than at the higher P levels. Root/shoot ratio was significantly correlated (r>0.6) with root dry weight over all P levels but not with any of the measured shoot characters (-0.2> r <0.3).

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Section: Results and Discussion Comparison Of Cultivarsmentioning

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Relationship Between Phosphorus Response and Root/shootmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

Caradus

Mackay

Dunlop

et al. 1995

Journal of Plant Nutrition

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“…Dusi, has been bred (Norton and FitzGerald 1993). During its juvenile stage, white clover is primarily dependent upon a taproot, but once mature the primary vegetative structure is a stolon with roots arising from the stoloniferous nodes (Caradus 1990). In this context, it is of note that in response to soil moisture deficit white clover does not allow the water potential of its stolons to decline as readily or as far as occurs in its leaves and petioles (Turner 1990).…”

Section: Perennial Legume Physiologymentioning

confidence: 99%

Prospects for improving perennial legume persistence in mixed grazed pastures of south-eastern Australia, with particular reference to white clover

Hayes¹,

Ara

Badgery

et al. 2019

Crop Pasture Sci.

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This review examines the prospect of improving perennial legume adaptation to grazed mixed pasture swards across the higher-altitude regions of south-eastern Australia through improved management, particularly as it relates to soil fertility. The range of adapted perennial species available to farmers often remains limited to only one perennial forage legume species, white clover (Trifolium repens L.). Despite recent advances in cultivars for increased persistence in dryland environments, white clover remains sensitive to drought with its inherently shallow root system and limited capacity to restrict water loss from herbage. With few alternative species likely to become widely available in the foreseeable future, prospects for extending the boundaries of perennial legume adaptation likely rely on a dual approach of improving soil fertility and further genetic improvement in white clover. Improved soil fertility would focus on overcoming soil acidity and addressing nutrient deficiencies, particularly of phosphorus, potassium, boron and molybdenum, which tend to be more widespread in the target region. Addressing these soil constraints would alleviate periodic moisture stress by: (1) increased water availability through improved infiltration and soil hydraulic properties; (2) increased root growth to maximise exploration of the soil volume; and (3) better maintenance of plant cell structures to foster improved osmotic regulation. However, the extent to which white clover adaption may be extended remains an issue of further research. This review highlights an opportunity for further genetic improvement of white clover by focusing on improving the capacity to recover from periodic droughts through seedling regeneration. Further breeding efforts in white clover should examine the feasibility of selecting for hard seed characteristics more similar to the best-adapted subterranean clover (Trifolium subterraneum L.) cultivars across this region to promote ongoing seedling regeneration.

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Phosphorus uptake characteristics of a world collection of white clover (Trifolium repens) cultivars

Mackay¹,

Caradus²,

Hart³

et al. 1990

Plant Nutrition — Physiology and Applications

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Response to phosphorus of a world collection of white clover cultivars

Cited by 14 publications

References 4 publications

Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

Prospects for improving perennial legume persistence in mixed grazed pastures of south-eastern Australia, with particular reference to white clover

Phosphorus uptake characteristics of a world collection of white clover (Trifolium repens) cultivars

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