The Effects of Light Intensity and External Potassium Level on Root/Shoot Ratio and Rates of Potassium Uptake in Perennial Ryegrass (Lolium perenne L.)

Hunt, Roderick; Burnett, Judith A.

doi:10.1093/oxfordjournals.aob.a084718

Cited by 58 publications

(33 citation statements)

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“…At the higher level of light and the lower levels of nutrients there is a relatively larger below-ground binary tree, and vice versa. These results entirely concur with much experimental data for real plants (for references see Hunt & Burnett 1973;Hunt & Lloyd 1987).…”

Section: Simulations Of Individual Growthsupporting

confidence: 88%

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Resource dynamics and plant growth: a self‐assembling model for individuals, populations and communities

Colasanti

Hunt

1997

Functional Ecology

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1. We describe a new model of plant growth that is general, deterministic, non‐stationary and mechanistic in nature. Its purpose is to investigate the extent to which the morphology and function of the whole plant can be determined by resource acquisition and utilization on the part of its components. 2. The model is a two‐dimensional section, showing the plant in its above‐ and below‐ground environments. The whole plant is represented by a branching structure made up from standard ‘modules’. The behaviour of the complete plant is determined exclusively by a rule set that acts only at the level of the individual module. 3. At the level of the whole plant, the model displays a classic S‐shaped growth curve, plasticity in root–shoot allocation, and foraging in heterogeneous environments. 4. At the level of the plant population, the model exhibits self‐thinning along a –2/1 self‐thinning line. This accords with the behaviour expected of a two‐dimensional system and also adds weight to the ‘geometric’ interpretation of the –3/2 self‐thinning line commonly seen in crowded populations of real plants. 5. An imposed ‘mutation’ in one of the modular rules allows us to produce a modified plant type that displays active foraging. In a set of simulations involving a model community containing both the modified and standard plant types, the modified type predominates in resource‐rich environments, and vice versa. 6. The simulations demonstrate the effectiveness of modular rule‐based methods from which whole‐plant behaviour can arise as an emergent property. The model suggests that active foraging carries a cost that cannot satisfactorily be borne at low levels of resource availability. It also implies that competition for resources, both above and below ground is in the form of a ‘contest’ (rather than a ‘scramble’). The success of the modular model highlights the primacy of resource acquisition and utilization in determining the ecological status of the plant.

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Section: Simulations Of Individual Growthsupporting

confidence: 88%

“…Evans 1972;Hunt 1982), functional equilibria between root and shoot allocation (e.g. Davidson 1969, Hunt & Burnett 1973, plasticity in root and shoot foraging (e.g. Hutchings 1988;Campbell & Grime 1989a,b), self-thinning according to geometric power laws (e.g.…”

Section: Current Objectivesmentioning

confidence: 99%

Resource dynamics and plant growth: a self‐assembling model for individuals, populations and communities

Colasanti

Hunt

1997

Functional Ecology

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“…The advantage of RSR is that this quantity is by its very structure more responsive to the change than root or shoot weight ratios, particularly when shoot weight (SW) is greater than root weight (RW) or vice versa. This quantity is very sensitive to environmental influences [35].…”

Section: Root:shoot Ratiomentioning

confidence: 99%

Demographic Plasticity in Relation to Growth and Resource Allocation Pattern in Anthemis Cotula –An Alien Invasive Species in Kashmir Himalaya, India

Allaie¹

2006

Appl Ecol Env Res

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“…Such alterations in root: shoot equilibrium in response to application of nutrients have been well documented (e.g. Jenkinson, Nowakowski and Mitchell, 1972;Hunt and Burnett, 1973;Hall, 1975;Hunt 1975;Bowen and Cartright, 1977) for many species, including T. subterraneum, (Osman, Raguse and Sumner, 1977) and their interpretation depends greatly on measurements of rates of nutrient uptake based on the amount of absorbing tissue (root length or root weight). In the experiments reported here, inflow of phosphate into roots (moles P absorbed per unit length root) increased as the level of applied soluble phosphate increased, particularly at the first two harvests (Table 4).…”

Section: -2mentioning

confidence: 99%

INFLOW OF PHOSPHATE INTO MYCORRHIZAL AND NON‐MYCORRHIZAL PLANTS OF TRIFOLIUM SUBTERRANEUM AT DIFFERENT LEVELS OF SOIL PHOSPHATE

Smith

1982

New Phytologist

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SUMMARYDuring early growth of mycorrhizal and non-mycorrhizal plants of Trifolium subterraneum fertilized with soluble (Na2HPO4) phosphate, inflow of phosphate (moles P absorbed per unit length root per unit time) into mycorrbizal roots from soil exceeded that into non-mycorrbizal roots over a range of levels of phosphate. High rates of uptake (up to 45 x 10~^^ mol phosphate cm~^ s"^) were associated with reductions in root: sboot dry wt ratios.The length of mycorrhizal root per plant was little affected by fertilization with phosphate. However, rapid growtb of roots at high levels of Na2HPO4 resulted in reductions in percentage root length infected by mycorrhizas. Results are discussed with respect to rates of uptake by whole plants and to differences in distribution of phosphate between roots and sboots in mycorrhizal and non-mycorrhizal plants.

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The Effects of Light Intensity and External Potassium Level on Root/Shoot Ratio and Rates of Potassium Uptake in Perennial Ryegrass (Lolium perenne L.)

Cited by 58 publications

References 0 publications

Resource dynamics and plant growth: a self‐assembling model for individuals, populations and communities

Resource dynamics and plant growth: a self‐assembling model for individuals, populations and communities

Demographic Plasticity in Relation to Growth and Resource Allocation Pattern in Anthemis Cotula –An Alien Invasive Species in Kashmir Himalaya, India

INFLOW OF PHOSPHATE INTO MYCORRHIZAL AND NON‐MYCORRHIZAL PLANTS OF TRIFOLIUM SUBTERRANEUM AT DIFFERENT LEVELS OF SOIL PHOSPHATE

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