CHARACTERIZATION OF BAMBARA GROUNDNUT (VIGNA SUBTERRANEA L.) GENOTYPES FOR RESISTANCE TO PARASITIC PLANTS, ALECTRA AND STIGA GESNERIOIDES
Akwapoly Journal of Communication and Scientific Research (APJOCASR)
Keywords:
Bambara groundnut, resistance, parasitic weeds, Alectra vogelii, Striga generioidesAbstract
Thirteen Bambara groundnut genotypes and a susceptible cowpea line (IT84S-2246-4) are being evaluated for their response to two legume parasitic weeds, Alecta vogelii and Striga gesnerioides. The haustorial development of Striga gesnerioides on the cowpea line is being demonstrated. The main objective of this project is to identify Bambara groundnut genotypes that are tolerant/resistant to these parasitic weeds and, therefore, select superior genotypes for further genetic improvement of this orphan crop for food, nutrition and environmental security. The cowpea line and 13 genotypes are being screened in triplicates using a random pot experiment design in nutrient-poor soil in a screen house. All the Bambara groundnut genotypes studied are resistant to the parasitic weed Striga gesneroides because there is no single shoot count in the pots containing all 13 genotypes in this study. The parasitic weed, Alectra vogelii, parasitizes all 13 genotypes studied, suggesting that no genotypes are resistant to Alectra in this screen. Significant differences exist in the number of Alectra shoots per pot for the Bambara groundnut genotypes (p<0.001). The number of emerged Alectra plants per pot is high (11-14) on the susceptible cowpea line IT84S-2246-4, readily infected by Striga gesnerioides. The haustoria penetrates the endodermis and becomes established in the susceptible cowpea line. Bambara groundnut genotypes are better tolerant to legume root-parasitic plants than cowpeas in parasitic weeds-infested soil. Improved understanding of parasitic weeds tolerance/resistance mechanisms in Bambara plants, which may be closely related to the amount of endogenous strigolactones produced by Bambara groundnut, is explored in a related TETFund IBR-funded project
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