Abstract
Wheat seedlings infected with a pure inoculum of the root-rotting fungus Rhizoctonia solani were grown in pots designed to fit in pressure chambers, to allow the effects of the Rhizoctonia infection on leaf growth to be studied while maintaining the leaves at elevated water status. Wheat was grown to the third leaf stage in soil inoculated with three different levels of Rhizoctonia, and the pots were then pressurised for seven days to maintain the leaf xylem at the point of bleeding (ie. the leaves were at full turgor). The reduction in leaf expansion caused by Rhizoctonia was not overcome by pressurisation, indicating that a reduced supply of water to the leaves was not responsible for reduced leaf growth. The addition of phosphorus to pots marginally deficient in P did not increase the leaf growth of Rhizoctonia-infected plants, despite increased P uptake to the leaves. These results indicate that a reduced supply of water to the leaves and a supply of phosphorus that was bordering on deficient was not the cause of the growth reduction in seedlings with Rhizoctonia infection. The nature of this reduced growth remains uncertain but may involve growth regulators produced by the fungus, or by the plant as a result of the infection process. The mechanism of these growth reductions is of interest as it may provide a key to the development of plant resistance mechanisms.
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References
ABARE 1996 Grain statistics 1995–96. Australian Bureau of Agricultural and Resource Economics, Canberra Australia.
Barrs H D 1985 Computer-assisted root length and leaf area measurement. CSIRO Division of Water Resources, Griffith, Technical Memorandum, 18 p.
Chan K Y, Mead J A and Roberts W P 1987 Poor early growth of wheat under direct drilling. Aust. J. Agric. Res. 38, 791–800.
Chan K Y, Mead J A, Roberts WP and Wong P TW1989 The effect of soil compaction and fumigation on poor early growth of wheat under direct drilling. Aust. J. Agric. Res. 42, 221–228.
Cornish P S and Lymbery J R 1987 Reduced early growth of direct drilled wheat in southern New South Wales: causes and consequences. Aust. J. Exp. Agric. 27, 869–880.
Dorffling K, Petersen W, Sprecher E, Ursbasch I and Hanssen H P 1984 Abscisic acid in phytopathogenic fungi of the genera Botrytis, Ceratocystis, Fusarium and Rhizoctonia. Z Naturforsch. 39C, 683–684.
El-Sharouny H M 1984 Screening of ethylene-producing rootinfecting fungi in Egyptian soil. Mycopath. 85, 13–15.
Fischer R A, Kono K and Howe G N 1994 Direct drilling effects on early growth of wheat: studies in intact soil cores. Aust. J. Exp. Agric. 34, 223–227.
Flentje N T 1957 Studies on Pellicularia filamentosa (Pat.) Rogers III. Host penetration and resistance and strain specialization. Trans. Brit. Mycol. Soc. 40, 322–336.
Frank J A and Francis S K 1976 The effect of a Rhizoctonia solani phytotoxin on potatoes. Can. J. Bot. 54, 2536–2540.
Hynes H J 1937 Studies on rhizoctonia root-rot of wheat and oats. New South Wales Department of Agriculture, Science Bulletin No. 58.
James R A, Kirkegaard J A and Munns R 1997 Reduced seedling growth of direct drilled wheat: studies on the role of Rhizoctonia with intact cores. Aust. J. Agric. Res. 48, 1231–1239.
Kirkegaard J A 1995 A review of trends in wheat yield responses to conservation cropping in Australia. Aust. J. Exp. Agric. 35, 835–848.
Kirkegaard J A, Angus J F, Gardner P A and Muller W 1994 Reduced growth and yield of wheat with conservation cropping. I. Field studies in the first year of the cropping phase. Aust. J. Agric. Res. 45, 511–528.
Kirkegaard J A, Munns R, James R A, Gardner P A and Angus J F 1995 Reduced growth and yield of wheat with conservation cropping II. Soil biological factors limit growth under direct drilling. Aust. J. Agric. Res. 46, 75–88.
MacNish G C 1985 Methods of reducing rhizoctonia patch of cereals in West. Aust. Plant Pathol. 34, 175–181.
Mandava N B, Orellana RG, Warthan J D, Worley J F, Dutky S R, Finegold H and Weathington B C 1980 Phyotoxins in Rhizoctonia solani: Isolation and biological activity of m-hydroxy-and m-methoxyphenylacetic acids. J. Agric. Food Chem. 28, 71–75.
McDonald H J and Rovira A D 1985 Development of an inoculation technique for Rhizoctonia solani and its application to screening cereal cultivars for resistance. In Ecology and Management of Soil-borne Plant Pathogens. Eds. C A Parker, AD Rovira, K J Moore, P T W Wong and J F Kollmorgen p 174. Amer. Phytopath. Soc.: St. Paul.
Neate S M 1984 Minimum cultivation and root diseases of wheat. PhD thesis University of Adelaide.
Nishimura S and Sabaki M 1963 Isolation of the phytotoxic metabolites of Pellicularia filamentosa. Ann. Phytopath. Soc. Jpn28, 228–234.
Passioura J B 1980 The transport of water from soil to shoot in wheat seedlings. J. Exp. Bot. 31, 333–345.
Passioura J B 1988 Root signals control leaf expansion in wheat seedlings growing in drying soil. Aust. J. Plant Physiol. 15, 687–693.
Passioura J B and Munns R 1984 Hydraulic resistance of plants. II. Effects of rooting medium, and time of day, in barley and lupin. Aust. J. Plant Physiol. 11, 341–350.
Reuter D J and Robertson J B (Eds.) 1986 Plant Analysis-An Interpretation Manual. Inkata Press, Melbourne 85 p.
Roget D 1995 Decline in root rot (Rhizoctonia solani AG-8) in wheat in a tillage and rotation experiment at Avon, South Australia. Aust. J. Exp. Agric. 35, 1009–1013.
Sherwood R T and Linberg C G 1962 Production of a phytotoxin by Rhizoctonia solani. Phytopath. 52, 586–587.
Termaat A and Munns R 1986 Use of concentrated macronutrient solutions to separate osmotic from NaCl-specific effects on plant growth. Aust. J. Plant Physiol. 13, 509–522.
Termaat A, Passioura J B and Munns R 1985 Shoot turgor does not limit shoot growth of NaCl-affected wheat and barley. Plant Physiol. 77, 869–72.
Wall P C, Neate S M, Graham R D, Reuter D J and Rovira A D 1994 The effect of rhizoctonia root disease and applied nitrogen on growth, nitrogen uptake and nutrient concentrations in spring wheat. Plant and Soil 163, 111–120.
Wallwork H 1996 Cereal root and crown diseases. pp 14–16, Kondinin Group Perth W.A.
Weinhold A R and Sinclair J B 1996 Rhizoctonia solani: Penetration, colonisation, and host response. In, Rhizoctonia species: Taxonomy, Molecular Biology, Ecology, Pathology and Disease Control. Eds. B. Sneh, S Jabaji-Hare, S Neate and G Dijst G pp 163–174. Kluwer Academic Publishers, Dordrecht.
Williams C H and Twine J R 1967 Determination of nitrogen, sulphur, phosphorus, potassium, sodium, calcium and magnesium in plant material by automatic analysis. Division of Plant Industry, Technical paper 24. CSIRO Australia.
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Kirkegaard, J., Munns, R., James, R. et al. Does water and phosphorus uptake limit leaf growth of Rhizoctonia-infected wheat seedlings?. Plant and Soil 209, 157–166 (1999). https://doi.org/10.1023/A:1004374516088
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DOI: https://doi.org/10.1023/A:1004374516088