• Bushamuka VN, Zobel RW. 1998b. Maize and Soybean Tap, Basal, and Lateral Root Responses to a Stratified Acid Aluminum-Toxic soil. Crop Science 38: 416421.
  • Cahn MD, Zobel RW, Bouldin DR. 1989. Relationship between root elongation rate and diameter and duration of growth of lateral roots of maize. Plant and Soil 119: 271279.
  • Craine JM, Wedin DA, Chapin FS III, Reich PB. 2002. Relationship between the structure of root systems and resource use for 11 North American grassland plants. Plant Ecology 165: 85100.
  • Freixes S, Thibaud MC, Tardieu F, Muller B. 2002. Root elongation and branching is related to local hexose concentration in Arabadopsis thaliana seedlings. Plant, Cell & Environment 25: 13571366.
  • Fusseder A. 1987. The longevity and activity of the primary root of maize. Plant and Soil 101: 257265.
  • Huck MG, Hoogenboom G, Peterson CM. 1987. Soybean root senescence under drought stress. In: TaylorHM, ed. Minirhizotron observation tubes: methods and applications for measuring rhizosphere dynamics. Madison, WI, USA: Agronomy Society of America, 109121.
  • Jones FR. 1943. Growth and decay of the transient (non-cambial) roots of alfalfa. Journal of the American Society for Agronomy 35: 625634.
  • Kevekordes KG, McCully ME, Canny MJ. 1988. Late maturation of large metaxylem vessels in soybean roots: significance for water and nutrient supply to the shoot. Annals of Botany 62: 105117.
  • King JS, Albaugh TJ, Allen HL, Buford M, Strain BR, Dougherty P. 2002. Seasonal dynamics of fine roots relative to foliage and stem growth in loblolly pine (Pinus taeda L.) as affected by water and nutrient availability. New Phytologist 154: 389398.
  • Lyford WH. 1975. Rhizography of non-woody roots of trees in the forest floor. In: TorreyJG, ClarksonDT, eds. The development and function of roots. New York, USA: Academic Press, 179196.
  • McCully ME. 1987. Selected aspects of the structure and development of field-grown roots with special reference to maize. In: GregoryPJ, LakeJV, RoseDA, eds. Root Development and Function Seminar series 30; Society for Experimental Biology. Cambridge, UK: Cambridge University Press, 5370.
  • Paollilo DJ, Zobel RW. 2002. The formation of adventitious roots on root axes is a widespread occurrence in field-grown dicotyledonous plants. American Journal of Botany 89: 13611372.
  • Pregitzer KS. 2002. Fine roots of trees – a new perspective. New Phytologist 154: 267273.
  • Pregitzer KS, DeForest JL, Burton AJ, Allen MF, Ruess RW, Hendrick RL. 2002. Fine root architecture of nine North American trees. Ecological Monographs 72: 293309.
  • Pregitzer KS, Kubiske ME, Yu CK, Hendrick RL. 1997. Relationships among root branch order, carbon and nitrogen in four temperate species. Oecologia 111: 302308.
  • Reynolds ERC. 1975. Tree rootlets and their distribution. In: TorreyJG, ClarksonDT, eds. The development and function of roots. London, UK: Academic Press, 163177.
  • Ryser P. 1998. Intra- and interspecific variation in root length, root turnover and the underlying parameters. In: LambersH, PoorterH, Van VuurenMMI, eds. Inherent variation in plant growth physiological mechanisms and ecological consequences. Leiden, The Netherlands: Backhuys Publishers, 441465.
  • St. Aubin G, Canny MJ, McCully ME. 1986. Living vessel elements in the late metaxylem of sheathed maize roots. Annals of Botany 58: 577588.
  • Thaler P, Pages L. 1996. Root apical diameter and root elongation rate of rubber seedlings (Heavea brasiliensis) show parallel responses to photoassimilate availability. Physiological Plant 97: 365371.
  • Tippett JT. 1982. Shedding of ephemeral roots in gymnosperms. Canadian Journal of Botany 60: 22952302.
  • Trewavas A. 1986. Understanding the control of plant development and the role of growth substances. Australian Journal of Plant Physiology 13: 447457.
  • Varney GT, Canny MJ, Wang XL, McCully ME. 1991. The branch roots of Zea I. First order branches, their number, sizes and division into classes. Annals of Botany 67: 357364.
  • Wells CE, Eissenstat DM. 2001. Marked differences in survivorship among apple roots of different diameters. Ecology 82: 882892.
  • Zobel RW. 1975. The genetics of root development. In: TorreyJG, ClarksonDF, eds. The development and function of roots. London, UK: Academic Press, 261275.
  • Zobel RW. 2003. Sensitivity analysis of computer-based diameter measurement from digital images. Crop Science 43: 583591.