Developmental processes in tree root systems

Factors that influence the primary and secondary growth of roots are reviewed in relation to the development of the form of tree root systems. The development of occasional root apices of larger than average diameter is important because they form the main axes that undergo secondary thickening and become permanent members of the woody root system. The formation of these large apices is influenced by injury to, or reduced growth or dormancy of, the subtending main root axis and by proximity to the shoot. The base of the taproot and laterals is seen as a region strongly influenced by shoot activity, resulting in the formation of additional large root apices and enhanced secondary thickening to form the zone of rapid taper in trees, and in the formation of storage organs in some herbaceous species such as radish. The main root axes compete for assimilates and dominance is established between them at an early age. The unequal growth of competing lateral roots is influenced by the local environment of the roo...

[1]  A. Cooper,et al.  Root Temperature and Plant Growth , 1966, Nature.

[2]  R. G. McMinn,et al.  CHARACTERISTICS OF DOUGLAS-FIR ROOT SYSTEMS , 1963 .

[3]  M. Coutts,et al.  The Influence of Mineral Nutrition on the Root Development of Trees I. THE GROWTH OF SITKA SPRUCE WITH DIVIDED ROOT SYSTEMS , 1976 .

[4]  J. Moorby,et al.  Vascular Transport and its Significance in Plant Growth , 1969 .

[5]  R. Loomis,et al.  Changes in the Cytokinins of Radish Roots during Maturation , 1971 .

[6]  E. Nambiar,et al.  ROOT CONFIGURATION AND ROOT REGENERATION IN PINUS RADIATA SEEDLINGS , 1980 .

[7]  G. Sagar,et al.  Distribution of secondary root growth potential in the root system of Pisum sativum. , 1970 .

[8]  W. A. Charlton.  THE ROOT SYSTEM OF LINARIA VULGARIS MILL. II: DIFFERENTIATION OF ROOT TYPES , 1967 .

[9]  H. Wilcox.  Regeneration of Injured Root Systems in Noble Fir , 1955, Botanical Gazette.

[10]  R. Loomis,et al.  CHEMICAL CONTROL OF VASCULAR CAMBIUM INITIATION IN ISOLATED RADISH ROOTS. , 1964, Proceedings of the National Academy of Sciences of the United States of America.

[11]  J. Deans.  Dynamics of Coarse Root Production in a Young Plantation of Picea sitchensis , 1981 .

[12]  T. L. Shininger.  The Control of Vascular Development , 1979 .

[13]  J. Radin,et al.  GROWTH AND DEVELOPMENT OF CULTURED RADISH ROOTS , 1972 .

[14]  C. Dobbs,et al.  Form and Development of Conifer Root Systems , 1969 .

[15]  G. McClure.  Nutrient distribution in root zones. III. Further studies of the effects of phosphorus distribution on corn and wheat , 1972 .

[16]  L. C. Promnitz,et al.  Comparative root system morphologies of seeded-in-place, bareroot, and containerized Douglas-fir seedlings after outplanting , 1979 .

[17]  E. Renshaw,et al.  Morphology of the Structural Root System of Sitka Spruce 1. Analysis and Quantitative Description , 1983 .

[18]  J. Digby,et al.  A NOTE ON THE EFFECT OF THE SHOOT AND ROOT APEX ON SECONDARY THICKENING IN PEA RADICLES , 1965 .

[19]  K. Thimann,et al.  Hormonal factors controlling the initiation and development of lateral roots , 1980 .

[20]  B. Wilson,et al.  ONTOGENETIC ANALYSIS OF TREE ROOTS IN ACER RUBRUM AND BETULA PAPYRIFERA , 1970 .

[21]  R. Aloni,et al.  Regeneration Around Wounds and the Control of Vascular Differentiation , 1975 .

[22]  J. L. Farrar.  LONGITUDINAL VARIATION IN THE THICKNESS OF THE ANNUAL RING , 1961 .

[23]  T. Kira,et al.  A QUANTITATIVE ANALYSIS OF PLANT FORM-THE PIPE MODEL THEORY : I.BASIC ANALYSES , 1964 .

[24]  M. Coutts.  GROWTH OF SITKA SPRUCE SEEDLINGS WITH ROOTS DIVIDED BETWEEN SOILS OF UNEQUAL MATRIC POTENTIAL , 1982 .

[25]  B. Wilson,et al.  DEVELOPMENT OF THE WOODY PORTION OF THE ROOT SYSTEM OF BETULA PAPYRIFERA , 1971 .

[26]  C. P. Barnes,et al.  The Structure and Life of Forest Trees , 1930 .

[27]  J. Staden,et al.  The effects of root decapitation on lateral root formation and cytokinin production in Pisum sativum , 1981 .

[28]  I. Alexander,et al.  Plant Root Systems. Their Function and Interaction with the Soil. , 1978 .