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Genetic analysis of larval survival and larval growth of two populations of Leptinotarsa decemlineata on tomato
Author(s) -
Lu Wenhua,
Kennedy George G.,
Gould Fred
Publication year - 2001
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1046/j.1570-7458.2001.00812.x
Subject(s) - biology , leptinotarsa , larva , colorado potato beetle , backcrossing , population , mendelian inheritance , maternal effect , adaptation (eye) , survivorship curve , zoology , botany , genetics , gene , offspring , demography , pregnancy , neuroscience , sociology , cancer
Abstract The genetics of adaptation to tomato in Leptinotarsa decemlineata (Say) were investigated in reciprocal F 1 , F 2 , and backcross populations generated from crosses between beetles from a tomato adapted population and from a population that was poorly adapted to tomato. Larvae from the parent and test populations were reared on tomato for four days, after which survivorship and larval weights were recorded. Most results indicate that differences in larval growth and survival on tomato between the parent populations are largely determined by autosomal, polygenic mechanisms, the inheritance of which involves a significant dominance component. However, results from F 2 crosses are not consistent with this conclusion. A significant difference in larval weights, but not in survival, between reciprocal F 1 populations in an analysis of combined data from four separate experiments suggests that maternal cytoplasmic effects may contribute to differences in larval performance on tomato between the adapted and unadapted populations. The unusual results obtained from F 2 crosses in this study are not atypical of results from previous studies of the genetics of adaptation to host plants by the Colorado potato beetle. Host plant adaptation by Colorado potato beetles may therefore involve unusual genetic mechanisms that are not easily assessed by classical Mendelian analysis.