Abstract
Sitophilus weevils are mainly pests of cereals, but some populations of S. oryzae are able to feed and breed on split peas. Genetical analyses and resistance tests were individually conducted by crossing individuals of a pea-resistant strain from China with those of a pea-susceptible strain from the laboratory (SFr). Adults from parental populations and progenies from F1 and F2 generations (two reciprocal crosses), as well as from backcrosses, were obtained on wheat and thereafter tested for their ability to survive on yellow split peas for 14 days. The expression of pea-resistance in S. oryzae is under simple Mendelian control implicating only one recessive and no sex-linked gene. Resistant populations able to develop on split peas are homozygous for the recessive gene, but some wild susceptible populations can contain heterozygous individuals at a very low frequency. The possible role of intracellular symbionts in pea detoxification was tested by comparing aposymbiotic and normally symbiotic populations. Symbionts were not directly required but might play a role in supplying disposable energy for the metabolism implicated in the detoxification of allelochemicals.
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Grenier, AM., Mbaiguinam, M. & Delobel, B. Genetical analysis of the ability of the rice weevil Sitophilus oryzae (Coleoptera, Curculionidae) to breed on split peas. Heredity 79, 15–23 (1997). https://doi.org/10.1038/hdy.1997.118
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DOI: https://doi.org/10.1038/hdy.1997.118
