Abstract
The objective of this work was to describe the relationship between elongation rate and diameter of maize roots and to estimate the length and growth duration of lateral roots of maize. Diameters and elongation rates of roots were measuredin situ on plants grown 5 weeks in small rhizotrons under greenhouse conditions. At the end of the experimental period the roots were harvested and diameters of axile and lateral roots were measured. The frequency distribution of diameters of harvested roots was bimodal with a minimum at 0.6 mm; 97% of axile roots were larger than this value and 98% of the lateral roots were smaller. Root elongation per day increased as diameter increased but the slope of the relationship with lateral roots was about 2.5 times that with axile roots when separate linear regressions were fitted to the two populations. The length of lateral roots found on axillary roots between the base and about 30 cm from the apex was approximately 2.2 cm. All of the data was consistent with the hypothesis that the lateral roots grew for about 2.5 days and then ceased growing. The axillary roots continued to grow throughout the experimental period at a rate of about 3 cm day−1.
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References
Burholt D R and Van't Hof J 1971 Quantitative thermal-induced changes in growth and cell population kinetics of Helianthus roots. Am. J. Bot. 56, 702–717.
Clowes F A L 1984 Size and activity of quiescent centres of roots. New Phytol. 96, 13–21.
de Vries P G 1979 Line intersect sampling-statistical theory, applications, and suggestions for extended useIn Sampling Biological Populations. Eds. R M Cormack, G P Pati and D S Robson. pp 1–70. International Co-operative Publishing House, Fairland, Maryland.
Esau K 1965 Plant Anatomy, 2nd Ed. J Wiley and Sons, Inc., New York, 767 p.
Feldman L J and Torrey J G 1975 The quiescent center and primary vascular tissue pattern formation in cultured roots of Zea. Can. J. Bot. 53, 2796–2803.
Fusseder A 1987 The longevity and activity of the primary root of maize. Plant and Soil 101, 257–265.
Hackett C 1969 Quantitative aspects of the growth of cereal root systems.In Root Growth. Ed. W J Whittington. pp 134–147. London, Butterworths.
Hackett C and Rose D A 1972a A model of the extension and branching of a seminal root of barley, and its use in studying relations between root dimensions, Part I. The model. Aust. J. Biol. Sci. 25, 669–679.
Hackett C and Rose D A 1972b A model of the extension and branching of a seminal root of barley, and its use in studying relations between root dimensions. Part II. Results and inferences from manipulation of the model. Aust. J. Biol. Sci. 25, 681–690.
Mason G F, Bhar D S and Hilton R J 1970 Root growth studies of Mugho pine. Can. J. Bot. 48, 43–47.
McCully M E and M J Canny 1985 Localization of translocated14C in roots and root exudates of field grown maize. Physiol. Plant. 65, 386–392.
McCully M E 1987 Selected aspects of the structure and development of field-grown roots with special reference to maize.In Root Development and Function. Eds. P J Gregory, J V Lake and D A Rose. pp 53–70 Cambridge University Press, Cambridge, Great Britain.
Newman E I 1966 A method of estimating the total length of root in a sample. J. Appl. Ecol. 3, 139–145.
Rose D A 1983 The description of the growth of root systems. Plant and Soil, 75, 405–415.
St. Aubin G, M J Canny, and M E McCully 1986 Living vessel elements in the late metaxylem of sheathed maize roots. Ann. Bot. 58, 577–588.
Torrey J G and Feldman L J 1977 The organization and function of the root apex. Amer. Sci. 65, 334–344.
Van't Hof J 1967 Studies on the relationships between cell population and growth kinetics of root meristems. Expl. Cell Res. 46, 335–347.
Van't Hof J and H K Ying 1964 Relation between the duration of the mitotic cycle, the rate of cell production, and the rate of growth of Pisum roots at different temperatures. Cytologia 29, 399–406.
Vermeer J and M E McCully 1982 The rhizosphere of Zea: New insight into its structure and development. Planta 156, 45–61.
Wilcox H E 1962a Growth studies of the root of incense cedar, Libocedrus decurrens. I. The origin and development of primary tissues. Am. J. Bot. 49, 221–236.
Wilcox H E 1962b Growth studies of the root of incense cedar,Libocedrus decurrens. II. Morphological features of the root system and growth behavior. Am. J. Bot. 49, 237–245.
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Contribution from the Department of Agronomy, New York State College of Agriculture and Life Sciences, Cornell University, Ithaca, NY 14853. Agronomy paper No. 1661. This research is part of the program of the Center for Root-Soil Research.
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Cahn, M.D., Zobel, R.W. & Bouldin, D.R. Relationship between root elongation rate and diameter and duration of growth of lateral roots of maize. Plant Soil 119, 271–279 (1989). https://doi.org/10.1007/BF02370419
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DOI: https://doi.org/10.1007/BF02370419