Abstract
Striga hermonthica is a serious root parasite of sorghum in the semiarid tropics. Successful parasitism is dependent on interactions of Striga seeds and host roots. Several sorghum cultivars have been found which resist parasitism. The basis of resistance is not well known. One possible method for reducing the chances of parasitism is by restricted host root development. This research was conducted to evaluate this hypothesis in sorghum known to possess resistance to parasitism by Striga.
Root length density of 21-day-old pot-grown resistant cultivars, Framida, N-13, IS-9830, Tetron and P-967083, were compared to that of the susceptible check, Dabar, using the line intercept method of measuring root length. There was no significant difference between resistant cultivars and the susceptible cultivar Dabar. The RLD of resistant P-967083 however was significantly less than Framida, another resistant cultivar.
The RLD of Dabar was compared to that of Framida and P-967083 in USA and Niger field trials. Root length density was determined on soil cores taken at flowering with a Giddings Soil Sampler. Each core was divided into 10-cm fractions for estimating RLD by the line intercept method. In the USA Dabar had significantly greater RLD than the two resistant cultivars in the upper 10-cm portion of the soil profile, but only significantly greater than P-967083 in the 10–20-cm portion. Significant differences in RLD between susceptible and resistant cultivars were not found at depths between 20–60 cm. In field trials in Niger, RLD of Dabar was significantly greater than either resistant cultivar in the (0 to 30 cm) portion of the soil core. These results suggest that part of the Striga resistance of P-967083 and perhaps Framida may be a result of avoiding interactions between parasitic seeds and host roots.
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References
Babiker A G T, Hamdoun A M and Mansi M G 1987 Influence of some soil and environmental factors on response of Striga hermonthica (Del) Benth. seeds to selected germination stimulants. In Proceedings of the 4th International Symposium on Parasitic Flowering Plants. Eds. H Chr Weber and W Forstreuter. pp 53–66. Marburg, FRG.
Bebawi F F, Eplee R E and Norris R S 1984 Effect of age, size, and weight of witchweed seeds on host parasite relations. Phytopath 74, 1074–1078.
Blum A, Arkin G R and Jordan W R 1977a Sorghum root morphogenesis and growth. I. Effect of maturity genes. Crop Sci. 17, 149–153.
Blum A, Arkin G R and Jordan W R 1977b Sorghum root morphogenesis and growth. II. Manifestation of heterosis. Crop Sci. 17, 153–157.
Burch G J, Smith R C G and Mason W K 1978 Agronomic and physiological responses of soybean and sorghum crops to water deficits. II. Crop evaporation soil water depletion and root distribution. Aust. J. Plant Physiol. 5, 169–177.
Dixon N H and Parker C 1984 Aspects of the resistance of sorghum varieties to Striga species. In Proceedings of the Third International Symposium on Parasitic Weeds. Eds. C Parker, L J Musselman, R M Pohill and A K Wilson. pp 123–132. ICARDA/International Parasitic Seed Plant Research Group, Aleppo, Syria.
Ejeta G 1983 ICRISAT Annual Report 1982. Patancheru, A. P., India, 277 p.
El Hiweris S O 1987 Nature of resistance to Striga hermonthica (Del.) Benth. parasitism in some Sorghum vulgare (Pers.) cultivars. Weed Res. 27, 305–311.
Jordan W R, Miller F R and Morris D E 1979 Genetic variation in root and shoot growth of sorghum in hydroponics. Crop Sci. 19, 468–472.
Mackay A D and Barber S A 1985a Soil moisture effects on root growth and phosphorus uptake by corn. Agron J. 77, 519–523.
Mackay A D and Barber S A 1985b Effect of soil moisture and phosphate level on root hair growth. Plant and Soil 86, 321–331.
Mackay A D, Kladivko E J, Barber S A and Griffith D R 1987 Phosphorus and potassium uptake by corn in conservation tillage systems. Soil Sci. Soc. Am. J. 51, 970–974.
Mengel D B and Barber S A 1973 Development and distribution of the corn root system under field conditions. Agron. J. 66, 341–344.
Merrill S D and Rawlings S L 1979 Distribution and growth of sorghum roots in response to irrigation frequency. Agron. J. 71, 738–745.
Musselman L J and Ayensu E S 1984 Taxonomy and biosystematics of Striga. In Striga: Biology and Control. Eds. E S Ayensu, H Dogget, R D Keynes, J Marton-Lefevre, L J Musselman, C Parker and A Pickering. pp 37–45. ICSU Press/IRDC Paris.
Netzly D H, Riopel J L, Ejeta G and Butler L G 1988 Germination stimulants of witchweed (Striga asiatica) from hydrophobic root exudate of sorghum (Sorghum bicolor). Weed Sci. 36, 441–446.
Noordwijk M van 1989 Methods for quantifications of root distribution pattern and root dynamics in the field. In Methodology in Soil-K Research, Proc. 20th Colloq. ipi, Gadenber Wien, 1987. Worblanjen ibern, ipi [1989] pp 263–281.
Nour A M and Weibel D E 1978 Evaluation of root characteristics in grain sorgham. Agron. J. 70, 217–218.
Obilana A T 1983 Socio-economic impact of Striga in cereal crops in West Africa. In Proceedings of the International Training Course on the Control of Striga in Cereal Crops, North Carolina State University, Raleigh, NC, 8–26 August.
Ogborn J E A 1972 Control of Striga hermonthica in peasant farming. In Proceedings of the 11th British Weed Control Conference, pp 1068–1077.
Parker C 1984 The Physiology of Striga species: Present state of knowledge and priorities for future research. In Striga: Biology and Control. Eds. E S Ayensu, H. Dogget, R D Keynes, J Marton-Lefevre, L J Musselman, C Parker and A Pickering. pp 179–193. ICSU Press/IRDC Paris.
Parker C 1983 Factors influencing Striga seed germination and host-parasite specificity. In Proceedings of the 2nd International Striga Workshop. pp 31–36. IRDC/ICRISAT.
Ramaiah K V 1987 Control of Striga and Orobanche species —a review. In Proceedings of the 4th International Symposium on Parasitic Flowering Plants. Eds. H Chr Weber and W Forstreuter. pp.637–644. Marburg, FRG.
Ramaiah K V 1986 Breeding cereal grains for resistance to witchweed. In Parasitic Weeds in Agriculture. I. Striga. Ed. L J Musselman. pp 227–242. CRC Press Inc, Boca Raton, FL.
Ramaiah K V 1984 Patterns of Striga resistance in sorghum and millets with special emphasis on Africa. In Striga: Biology and Control. Eds. E S Ayensu, H Dogget, R D Keynes, J Marton-Lefevre, L J Musselman, C Parker and A Pickering. pp 71–92. ICSU Press/IRDC Paris.
Robinson E L and Kust C A 1962 Distribution of witchweed seeds in the soil. Weeds 10, 335.
Smith C W 1978 Bayes least significant difference: A review and comparison. Agron. J. 70, 123–127.
Steele R G D and Torrie J H 1960 Principles and Procedures of Statistics with Special Reference to the Biological Sciences. McGraw-Hill, New York.
Tennant D 1975 A test of a modified line intersect method of estimating root length. J. Ecol. 63, 995–1001.
Upchurch D R and Ritchie J T 1983 Root observation using a video recording system in mini-rhizotrons. Agron. J. 75, 1009–1015.
Zartman R E and Woyewodzic R T 1979 Root distribution patterns of two hybrid grain sorghums under field conditions. Agron. J. 71, 325–328.
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Cherif-Ari, O., Housley, T.L. & Ejeta, G. Sorghum root length density and the potential for avoiding striga parasitism. Plant Soil 121, 67–72 (1990). https://doi.org/10.1007/BF00013098
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DOI: https://doi.org/10.1007/BF00013098