Abstract
The effects of conditions pre-dating germination on growth rate of impeded barley cv. Harrington roots were measured using an agar-capillary tube technique. Seedling root tips were directed into glass capillary tubes twothirds filled with agar at eight concentrations ranging from 1.6 to 9.6%, equivalent to penetrometer resistances of 25 to 1240 kPa. The rate of unrestricted root elongation (growth in air) of seed stored for 13 months (old seed), and of seed grown for a second generation without subsequent storage (new seed) was compared with growth in agar over a 24-hour interval. Root elongation rate of old and new seed was identical in the absence of resistance. At low to intermediate agar concentrations, elongation was significantly slower in roots from old, compared with new seed. At high agar concentrations root growth of old and new seed was the same. In both old and new seed, root growth through agar was greater in seed that germinated after 24, compared with 48 h. Differences in impeded root growth between old and new seed were lost in progeny of the test seed. Environmental factors that pre-date germination are an important influence on the ability of seedling roots to elongate through soil.
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References
Abdalla F A and Roberts E H 1969 The effect of seed storage conditions on the growth and yield of barley, broad beans and peas. Ann Bot. 33, 169–184.
Barley K P Farrell D A and Greacen E L 1965 The influence of soil strength on the penetration of a loam by plant roots. Aust. J. Soil Res. 3, 69–79.
Bengough A G and Mullins C E 1991 Penetrometer resistance, root penetration resistance and root elongation rate in two sandy loam soils. Plant and Soil 131, 59–66.
Bennie A T P 1991 Growth and mechanical impedance.In Plant Root, The Hidden Half. Ed. Y Waisel, Marcel Dekker, Inc., New York, 393–414.
Bennie A T P and Botha F J P 1986 Effect of deep tillage and controlled traffic on root growth, water-use efficiency and yield of irrigated maize and wheat. Soil Till. Res. 7, 85–95.
Bonnett O T 1935 The development of the barley spike. J. Agric. Res. 51, 451–457.
Brereton J C, McGowan N and Dawkins T C K 1986 The relative sensitivity of spring barley, spring field beans and sugar beet crops to soil compaction. Field Crops Res. 13, 223–232.
Carefoot J M, Chang C, Lindwall C W and Volkmar K M 1993 Soil compaction as affected by traffic and soil moisture conditions in southern Alberta: Amelioration of compaction through natural processes and tillage methods. Canada Alberta Research Trade and Technology Final Technical Report, Project No. 100991.
Dell'Aquila A 1987 Mean germination time as a monitor of the seed aging. Plant Physiol. Biochem. 25, 761–768.
Delouche J C and Baskin C C 1973 Accelerated aging technique for predicting the relative storability of seed lots. Seed Sci. Technol. 1, 427–452.
Dexter A R 1987 Mechanics of root growth. Plant and Soil 98, 303–312.
Eavis B W, Ratliff L F and Taylor H M 1969 use of a dead load technique to determine axial root growth pressure. Agron. J. 61, 640–643.
Harrison B J 1966 Seed deterioration in relation to storage conditions and its influence upon germination, chromosomal damage and plant performance. J. Nat'l Inst. Agric. Bot 10, 644–663.
Materechera S A, Dexter A R and Alston A M 1991 Penetration of very strong soils by seedling roots of different plant species. Plant and Soil 135, 31–41.
Passioura J B 1974 Effect of root geometry on the water relations of temperate cereals (wheat, barley, oats).In Structure and Function of Primary Root tissues. Ed. JKolek. Veda Publishing House, Bratislava, 359–433.
Rodriguez A and McDonald M BJr 1989 Seed quality influence on plant growth and dinitrogen fixation of red field bean. Crop Sci. 29, 1309–1314.
Taylor H M and Gardner H R 1963 Penetration of cotton seedling taproots as influenced by bulk density, moisture content, and strength of soil. Soil Sci. 96, 153–156.
Taylor H M and Ratliff L F 1969 Root elongation rates of cotton and peanuts as a function of soil strength and soil water content. Soil Sci. 108, 113–119.
TeKrony D M, Bustaman T, Egli B E and Pfeiffer T W 1987 Effects of soybean seed size, vigour and maturity on crop performance in row and hill plots. Crop Sci. 27, 1040–1045.
Tekrony D M and Egli D B 1991 Relationship of seed vigor to crop yield: a review. Crop Sci. 31, 816–822.
Whitely G M, Utomo W H and Dexter A R 1981 A comparison of penetrometer pressures and the pressures exerted by roots. Plant and Soil 61, 351–364.
Whytock G P and Powell A A 1986 Assessments of visible mechanical damage to barley grain and its effect on seed germination and seedling vigour. J. Agric. Sci. Camb. 107, 257–262.
Wijandi S and Copeland L O 1974 Effect of origin, moisture content, maturity and mechanical damage on seed and seedling vigour of beans. Agron. J. 66, 546–548.
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LRS Contribution no. 3879349
LRS Contribution no. 3879349
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Volkmar, K.M. Pre-germination effects on mechanically impeded root growth of barley (Hordeum vulgare L). Plant Soil 163, 197–202 (1994). https://doi.org/10.1007/BF00007968
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DOI: https://doi.org/10.1007/BF00007968