Quantitative Studies of Root Development I. The Influence of Nutrient Concentration

May, LH; Chapman, Fay H; Aspinall, D.

doi:10.1071/bi9650025

Cited by 49 publications

(22 citation statements)

References 8 publications

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“…In the present study, experiments lasted only 10 DAT but the constant root growth in the later stages irrespective of the rooting medium suggests that the rate of root growth may be under stable internal control, and perhaps large responses to environmental variation occur only during the early stages of growth. This confirms the suggestion that the responsiveness of plants to environmental variation decreases with the age of the plant (May et al 1965(May et al , 1967. As expected, LR number and length increased with time to a point.…”

Section: Effect Of Rooting Medium On Root Growthsupporting

confidence: 88%

“…There were consistent patterns of root number and length increase in the B. rapa seedlings. This trend has long been established in many crops, including barley (May et al 1965;Rahman et al 1975) and wheat (Tennant 1975). An interesting feature, however, is the observation here that number and RMR of first-order LRs was altered by the nature of the medium in which the roots were growing and that a medium effect on RMR was evident between 2 and 5 DAT for R500 and between 2 and 8 DAT for IMB211.…”

Section: Effect Of Rooting Medium On Root Growthmentioning

confidence: 97%

“…Lower values of TI indicate dichotomous systems with increasing orders of lateral roots (Crush et al 2005). The relative rates of extension (RRE) of total, primary and total LRs, the relative multiplication rate (RMR) of LRs and the mean extension rate (MER) of seedlings grown with the different rooting media were calculated as described by May et al (1965) and Tennant (1976):…”

Section: Extraction Of Geometrical Featuresmentioning

confidence: 99%

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Effects of rooting media on root growth and morphology of Brassica rapa seedlings

Adu

Yawson

Armah

et al. 2016

South African Journal of Plant and Soil

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Section: Effect Of Rooting Medium On Root Growthsupporting

confidence: 88%

Section: Effect Of Rooting Medium On Root Growthmentioning

confidence: 97%

Section: Extraction Of Geometrical Featuresmentioning

confidence: 99%

See 1 more Smart Citation

Effects of rooting media on root growth and morphology of Brassica rapa seedlings

Adu

Yawson

Armah

et al. 2016

South African Journal of Plant and Soil

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“…Therefore, a mother root inhibits lateral root emergence before restricting its own growth (May et al 1965(May et al , 1967Hackett 1972;Drew et al 1973). In heterogeneous soil, when a stressed root reaches a zone with conditions ideal for growth, any inhibition of branching can be followed by a proportional stimulation of lateral root development.…”

Section: Root Extraction Of Soil Watermentioning

confidence: 96%

Desirable plant root traits for protecting natural and engineered slopes against landslides

Stokes

Atger²,

Bengough³

et al. 2009

Plant Soil

582

337

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‘Ground Bio- and Eco-engineering: The Use of Vegetation to Improve Slope Stability—ICGBE2' held at Beijing, China, 14–18 July 2008. Several papers from this conference are published in this edition of Plant and Soil.International audienceSlope stability models traditionally use simple indicators of root system structure and strength when vegetation is included as a factor. However, additional root system traits should be considered when managing vegetated slopes to avoid shallow substrate mass movement. Traits including root distribution, length, orientation and diameter are recognized as influencing soil fixation, but do not consider the spatial and temporal dimensions of roots within a system. Thick roots act like soil nails on slopes and the spatial position of these thick roots determines the arrangement of the associated thin roots. Thin roots act in tension during failure on slopes and if they traverse the potential shear zone, provide a major contribution in protecting against landslides. We discuss how root traits change depending on ontogeny and climate, how traits are affected by the local soil environment and the types of plastic responses expressed by the plant. How a landslide engineer can use this information when considering slope stability and management strategies is discussed, along with perspectives for future researc

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“…For instance, in an homogeneous environment, the root of order 1 of a young oak tree has a continuous, linear growth (elong is a constant for that root) whereas lateral roots of order 2 have a determinate growth with varying maximum length (Riedacker & Belgrand, 1983;Belgrand et al, 1987) (elong is then a decreasing function of the age of the meristem). In young barley plants, May et al (1965) observe that roots of order 1, 2 or 3 all grow linearly in an homogeneous environment. But the growth rate decreases sharply from order 1 to order 3.…”

Section: Growthmentioning

confidence: 99%

Growth and development of root systems: Geometrical and structural aspects

Pagès

Kervella

1990

Acta Biotheor

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The agronomist who wants to study the nutrient and water uptake of roots needs a quantitative three-dimensional dynamic model of the structure of root systems.The model presented takes into account current knowledge about the morphogenesis of root systems. It describes the root system as a set of root axes, characterised by their orders. The morphogenetic properties of root axes differ according to their order. The axes of order 1 are directly inserted on the stem, the axes of order 2 are inserted on axes of order 1, and so on. They tend to be more plagiotropic and to have less vascular bundles as the order increases.The evolution of the simulated structure is achieved by three processes: emission of new root axes from the shoot, growth and branching of existing root axes. The elongation of an axis depends on its order and on local growing conditions. Branches appear acropetally at a specified distance from the apex and from former branches, along ranks facing xylem poles, with a branching angle specific of their order.From the three-dimensional branched structures simulated by the model, various outputs, such as kinetics of growth and development, root profiles or cross-section maps can be computed, compared to observed data and used as inputs in uptake models. Some examples of such possible outputs are presented. P~SUM~L'agronome qui veut ~tudier l'absorption hydrique et min6rale des racines a besoin d'un module dynamique tri-dimensionnel de la structure du syst~me racinaire.Le module pr~sent~ est fond6 sur les connaissances actuelles sur la morphogen~e racinaire. Le syst~me racinaire y est repr6sent6 comme un ensemble d'axes caract6ris6s par leur ordre. En effet, les propri~t6s morphog6n~tiques des racines varient d'un ordre ~ l'autre. Les axes d'ordre 1 sont ins6r6s directement sur la tige, les axes d'ordre 2 sur les axes d'ordre 1, et ainsi de suite. Les axes tendent ~t dtre de plus en plus plagiotropes et ~ avoir de moins en moins de faisceaux vasculaires quand l'ordre augmente.Trois processus interviennent pour faire 6voluer la structure racinaire simul6e au cours du temps: l'6mission de nouveaux axes racinaires /t partir des tiges, la croissance, et la ramification des axes 290 existants. L'61ongation d'un axe est fonction de son ordre, et des conditions de croissance locales. La ramification a lieu de racoon strictement acropStc, fi une distance donn6e de l'apex et des ramifications existantes, en face des p61es de xylSme. L'angle d'insertion sur l'axe porteur est sp6cifique de l'ordre.A partir des structures tri-dimensionnelles ainsi cr66es, il est possible de calculer des cin6tiques de croissance et de d6veloppement, des profils ou des cartes racinaires, qui peuvent ensuite 6tre compar6es des observations et utilisdes dans des modSles d'absorption. Nous en donnons quelques exemples.

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Quantitative Studies of Root Development I. The Influence of Nutrient Concentration

Cited by 49 publications

References 8 publications

Effects of rooting media on root growth and morphology of Brassica rapa seedlings

Effects of rooting media on root growth and morphology of Brassica rapa seedlings

Desirable plant root traits for protecting natural and engineered slopes against landslides

Growth and development of root systems: Geometrical and structural aspects

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