Factors affecting the direction of growth of tree roots

Coutts, M. P.

doi:10.1051/forest:19890565

Cited by 47 publications

(22 citation statements)

References 34 publications

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“…Internal controls are inherent in root development and also include signals from the shoot. External factors are water content (Sperry et al, 2002), nutrient composition and concentration (Clarckson, 1996), oxygen concentration (Armstrong & Drew, 2002), pH value (Gerendás & Ratcliffe, 2002), temperature, soil mechanical resistance (Rufelt, 1965;Coutts 1989;Masle, 2002) with which plant roots interact through processes such as gravitropism (Coutts & Nicoll, 1991), hydrotropism (Jaffe et al, 1985;Coutts & Nicoll, 1993;Takahashi & Scott, 1993;Takano et al, 1995), thigmotropism (Jaffe & Forbes, 1993;Massa & Gilroy, 2003), oxygravitropism (Porterfield, 1998), thermotropism (Fortin & Poff, 1990). However, there is some controversy regarding hydrotropic root behaviour in natural or field conditions.…”

Section: Modelling Of Root Architecturementioning

confidence: 99%

Towards developmental modelling of tree root systems

Tobin

Čermák

Chiatante

et al. 2007

Plant Biosystems - An International Journal Dealing with all As

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Knowledge of belowground structures and processes is essential for understanding and predicting ecosystem functioning, and consequently in the development of adaptive strategies to safeguard production from trees and woody plants into the future. In the past, research has mainly been concentrated on growth models for the prediction of agronomic or forest production. Newly emerging scientific challenges, e.g. climate change and sustainable development, call for new integrated predictive methods where root systems development will become a key element for understanding global biological systems. The types of input data available from the various branches of woody root research, including biomass allocation, architecture, biomechanics, water and nutrient supply, are discussed with a view to the possibility of incorporating them into a more generic developmental model. We discuss here the main focus of root system modelling to date, including a description of simple allometric biomass models, and biomechanical stress models, and then build in complexity through static growth models towards architecture models. The next progressive and logical step in developing an inclusive developmental model that integrates these modelling approaches is discussed.

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Section: Modelling Of Root Architecturementioning

confidence: 99%

Towards developmental modelling of tree root systems

Tobin

Čermák

Chiatante

et al. 2007

Plant Biosystems - An International Journal Dealing with all As

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“…Roots (Callot, 1983). Le développe-ment du système racinaire exerce en effet une influence prépondérante sur l'alimention hydrique et minérale (Forristall et Gessel, 1955;Lévy, 1968), notamment sur le réapprovisionnement de la rhizosphère et le déroulement de fonctions métaboliques qui limitent la croissance des plantes (Martens, 1975 (Weller, 1965;Vartanian, 1974;Pritchett, 1979, Henderson et al, 1983Coutts, 1989 (CPCS, 1967;Duchaufour, 1991). Un complé-ment d'information portant sur l'organisation des horizons a été obtenu par une étude microscopique effectuée sur des sections fines (6 x 8 cm) de prélèvements pris à 70, 90, 130, 150, 210, 230, 250, 270, 290, 390 et (Sika, 1963;Kostler et al, 1968;Belgrand, 1983 …”

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Organisation du système racinaire du chêne pédonculé (Quercus robur) développé en conditions édaphiques non contraignantes (sol brun lessivé colluvial)

Lucot

Bruckert

1992

Ann. For. Sci.

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“…The downward curvature of the root tipped toward the center of gravity is influenced by biochemical and environmental factors and is considered as an essential characteristic for plant survival (He and South 2006). According to Coutts (1989), if the root is displaced from its vertical position or the seeds oriented vertically upward with respect to micropyle, the tip of the root bends downward. Similarly, the roots of the seed sown by positioning the micropyle vertically upright have to curve over the seed itself in order to grow in their normal (downward) direction (Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of micropyle orientation on germination of Millettia ferruginea and Delonix regia

Zewdie¹,

Welka²

2015

Ecol Process

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Introduction: In order to solve the problems related to deforestation and meet the ever increasing demands of the growing population, conserving and wise utilization of the remaining forests and supporting it with additional tree planting are crucial. Proper understanding of efficient management technique including seed sowing methods for target species is vital. Research reports and other information on proper positioning of micropyles in field conditions are lacking for Millettia ferruginea (Hochst.) Baker and Delonix regia (Bojer ex Hook.). This study was initiated to assess variations in germination characteristics of seeds sown at different orientations with respect to the micropyle position and to identify the sowing position that gives the best seed germination outcomes for those tree species when measured by selected parameters. Results: Sowing position where the micropyle of the seed was directed downward has shown the best result with regard to speed of germination, mean germination time, mean daily germination, peak value, germination value, and germination percents for both tree species and was significant for D. regia. Conclusions: It is essential to consider the effects of different sowing positions in achieving production targets with good quality seedlings. The seeds of D. regia should be sown in nurseries carefully by positioning its micropyle downward. Moreover, seeds sown with the micropyle positioned upward showed the least results in terms of germination for both tree species (significant in D. regia).

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Factors affecting the direction of growth of tree roots

Cited by 47 publications

References 34 publications

Towards developmental modelling of tree root systems

Towards developmental modelling of tree root systems

Organisation du système racinaire du chêne pédonculé (Quercus robur) développé en conditions édaphiques non contraignantes (sol brun lessivé colluvial)

Effect of micropyle orientation on germination of Millettia ferruginea and Delonix regia

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