© Global Journal Of Agricultural Sciences . 2002. Vol. 2 No. 1
Publisher: Bachudo Science Co. Ltd
Germination of Witchweed [STRIGA HERMONTHICA(DEL)Benth.]Seeds In Response To Stimulation By Root Exudates of Soybean (Glycine Max L.}
E. S. Okpo, S. T. 0. Lagoke, W. B. Ndahi, O. O. Olufajo, R. Tabo
KEYWORDS: witchweed, soybean, trapcropping, crop rotation, Striga hermonthica
ABSTRACT:Using an adaptation of the Cut-root technique, twenty-one varieties of soybean were screened at 10, 15 and 20 days after planting (OAP) for the stimulation of S. hermonthica seed germination. The varieties were TGX1649-11F, TGX1740-7F, TGX1660-15F, TGX1740-2F, TGX1670-3F, TGX1674-3F and SAMSOY-2. Other varieties tested included TGX1681-3F, TGX1479-1 E, TGX923-2 E, TGX1440-1 E, TGX1448-2 E, TGX1660-19F, TGX1519-10F, TGX1019-2EN, TGM-344, TGX1019-EB, TGX1485-'ID, TGX536-02D, TGM-351 and TGX849-3B. The strigol analogue, GR-24, was used as the control .. The germination of S. hermonthica seeds that was stimulated by GR-24 was significantly higher (Ps0.01) than that stimulated by all the soybean varieties at all the periods. The rnost promising varieties were TGX1681-3F, TGX1479-1 E ,TGX1649-11 F and SAMSOY-2 with Specific Effectiveness Index (SEI) values of 0.76, 0.75, 0.58 and 0.54, respectively. The other varieties that showed promise include TGX1740-?F ,TGX923-2E TGX1440-1 E and TGM344 with SEI · values of 0.44, 0.44, 0.45 and 0.44, respectively. There was no relationship between the age of the plant and potency of its root exudates, except for TGX1649-11F, TGM-344 and TGX1681-3F where activity increased with age from 10DAP to 20DAP. These varieties may therefore be used in field crop rotation systems as an option for the management of S hermonthica.
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