Effects of Seed Physical Characteristics of Benin Soybean Germplasm on their Resistance to Callosobruchus maculatus Fabricius (Coleoptera: Bruchidae)
Effects of Seed Physical Characteristics of Benin Soybean Germplasm on their Resistance to Callosobruchus maculatus Fabricius (Coleoptera: Bruchidae)
Yêyinou Laura Estelle Loko1*, Joelle Toffa1, Azize Orobiyi1, Gbèblonoudo Anicet Dassou2, Rolande Okpeicha1, Dieudonné Gavoedo1 and Alexandre Dansi2
ABSTRACT
The pulse beetle Callosobruchus maculatus Fabricius (Coleoptera: Bruchidae) is an important pest of stored soybean grains. It is imperative to screen out the prevailing genotypes of Beninese soybean cropping systems in order to find out the resistant ones against C. maculatus infestations. The effect of seven grain physical traits (testa thickness, colour, texture, hardness, length, breadth, and 100-grain mass) on the susceptibility of eight soybean varieties to C. maculatus were evaluated in the laboratory. The correlations and contributions of the studied traits were evaluated using correlation path coefficient analysis. The tested soybean varieties showed a variation in physical seed characteristics. A differential susceptibility of soybean varieties to C. maculatus was observed, with the white seeded variety Whéwhé having longest and largest grains was the most susceptible. Based on the Dobie susceptibility index, the Yovoton variety was proved to be resistant to C. maculatus attacks. While, Kecheke, Houeton, Adjaton and Vovoh varieties were classified as moderately resistant to C. maculatus. The correlation analysis indicated that 100-seed weight had significant positive correlation with F1 progeny (r = 0.439), seed consumption (r = 0.467), number of eggs laid (r = 0.295) and susceptibility index (r = 0.453). Path coefficient analysis showed that each seed physical character and its interactions with the others characters influenced soybean grains susceptibility to C. maculatus. Soybean seed thickness showed the higher direct positive effect on soybean susceptibility to C. maculatus indicating that breeding should be done based on this trait to improve soybean seed resistance.
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