title: How Different Genetically Manipulated Brassica Genotypes Affect Life Table Parameters of Plutella xylostella (Lepidoptera: Plutellidae).
abstract: The fitness of Plutella xylostella L. on different genetically manipulated Brassica plants, including canola's progenitor (Brassica rapa L.), two cultivated canola cultivars (Opera and RGS003), one hybrid (Hyula401), one gamma-ray mutant-RGS003, and one transgenic (PF) genotype was compared using two-sex and female-based life table parameters. All experiments were conducted in a growth chamber at 25±1°C, 65±5% relative humidity, and a photoperiod of 16:8 (L:D) h. There were significant differences in duration of different life stages of P. xylostella on different plant genotypes. The shortest (13.92 d) and longest (24.61 d) total developmental time were on Opera and PF, respectively. The intrinsic rate of increase of P. xylostella ranged between 0.236 (Opera) and 0.071 day(-1) (PF). The highest (60.79 offspring) and lowest (7.88 offspring) net reproductive rates were observed on Opera and PF, respectively. Comparison of intrinsic rate of increase, net reproductive rates, finite rate of increase, mean generation time, fecundity, and survivorship of P. xylostella on the plant genotypes suggested that this pest performed well on cultivars (RGS003 and Opera) and performed poorly on the other manipulated genotypes especially on mutant-RGS003 and PF. Glucosinolate levels were significantly higher in damaged plants than undamaged ones and the lowest and highest concentrations of glucosinolates were found in transgenic genotype and canola's progenitor, respectively. Interestingly, our results showed that performance and fitness of this pest was better on canola's progenitor and cultivated plants, which had high levels of glucosinolate.
authors.affiliation: Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box 14115-336, Tehran, Iran.
authors.forename: Mehrnoosh
authors.initials: M
authors.lastname: Nikooei
authors.affiliation: Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box 14115-336, Tehran, Iran. fathi@modares.ac.ir.
authors.forename: Yaghoub
authors.initials: Y
authors.lastname: Fathipour
authors.affiliation: Department of Plant Breeding, Faculty of Agriculture, Tarbiat Modares University, P. O. Box 14115-336, Tehran, Iran.
authors.forename: Mokhtar
authors.initials: M
authors.lastname: Jalali Javaran
authors.affiliation: Agricultural, Medical and Industrial Research School, P. O. Box 31485-498, Karaj, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Soufbaf
mesh_terms: D000818:Animals; D001937:Brassica / Q000235:genetics* / Q000378:metabolism; D005260:Female; D005298:Fertility; D005961:Glucosinolates / Q000378:metabolism*; D060434:Herbivory; D008297:Male; D009036:Moths / Q000254:growth & development*; D030821:Plants, Genetically Modified
chemical_list: D005961:Glucosinolates
keywords: Plutella xylostella; glucosinolate; manipulated Brassica; plant chemical defense; two-sex life table