Relative fitness of near isogenic lines for melanie and typical forms of the oriental armyworm, Mythimna separata (Walker)
文献类型: 外文期刊
第一作者: Luo, Li-Zhi
作者: Luo, Li-Zhi;Zhang, Lei
作者机构:
关键词: Mythimna separata;melanism;near isogenic lines;relative fitness;life history strategy
期刊名称:ENVIRONMENTAL ENTOMOLOGY ( 影响因子:2.377; 五年影响因子:2.298 )
ISSN: 0046-225X
年卷期: 2007 年 36 卷 5 期
页码:
收录情况: SCI
摘要: Melanism in the oriental armyworm Mythimna separata (Walker) is characterized by a black color in adults instead of the normal body color of off-white. Because inheritance of melanism in this moth follows Mendel's law, with the melanic allele (t) recessive to the normal allele (7) at a single autosomal locus, a backcrossing procedure was used to develop near isogenic lines (NILs) for melanic (NILs-tt) and typical forms (NILs-TT) of this moth. Melanic mates (tt) and typical females (TT) were crossed in the laboratory, their progeny (F,) were interbred, and F, melanic males were backcrossed to typical female offspring of the parallel line. This cycle was repeated five times to create NILs for melanic and typical forms of this moth. The effects of the melanic allele on relative fitness were evaluated in terms of developmental and reproductive characteristics. Life tables of the NILs were constructed to determine net reproductive rate (R-0). Results indicated that NILs-tt possessed apparent developmental and reproductive advantages, including shorter immature development time, higher larval and pupal survival, a shorter adult preoviposition period, and more eggs laid per female compared with the NLIs-TT.
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