Bashasab Fakrudin, Krishnareddy Kambalapally B, Kuruvinashetti Mahaling S, Patil Basavaraj V
Department of Biotechnology, University of Agricultural Sciences, Dharwad, India 580005.
J Econ Entomol. 2007 Jun;100(3):903-8. doi: 10.1603/0022-0493(2007)100[903:mcahal]2.0.co;2.
Helicoverpa armigera (Hiibner) (Lepidoptera: Noctuidae) is a well-known polyphagous insect pest. Mating compatibility among the insects occurring on different host plants is essential for free gene flow among populations. We tested the extent of crossability and fecundity of the insects that survived on Bacillus thuringiensis (Bt) cotton with those occurring on pigeon pea, Cajanus cajun (L.) Millsp., non-Bt cotton, Gossypium hirsutum L.; sunflower, Helianthus annuus; sorghum, Sorghum bicolor L. Moench.; okra, Abelmoschus moschatus Medikus; chickpea, Cicer arietinum L.; marigold, Tagetes spp.; and tomato, Lycopersicum esculentum L., crops. The insects from different crops were freely crossable with those collected from Bt cotton and among themselves. The average fecundity across different crosses ranged from 314.1 to 426.3 in direct and from 305.8 to 421.7 eggs per female in reciprocal crosses. In any given cross, a minimum of 85.89% egg hatch was recorded. Furthermore, the F1 individuals of different cross combinations were found to cross freely with their parents (BC1) and among themselves with similar fecundity and egg hatch. High crossability among H. armigera occurring on different host plants suggests that crop mosaics that may exist in countries such as India could play an important role as natural, nonstructured refugia and prolong the durability of the genes deployed for controlling this insect.
棉铃虫（Helicoverpa armigera (Hiibner)，鳞翅目：夜蛾科）是一种著名的多食性害虫。在不同寄主植物上生存的昆虫之间的交配兼容性对于种群间的自由基因流动至关重要。我们测试了在苏云金芽孢杆菌（Bt）棉花上存活的昆虫与在木豆（Cajanus cajun (L.) Millsp.）、非Bt棉花（陆地棉Gossypium hirsutum L.）、向日葵（Helianthus annuus）、高粱（Sorghum bicolor L. Moench.）、秋葵（Abelmoschus moschatus Medikus）、鹰嘴豆（Cicer arietinum L.）、万寿菊（Tagetes spp.）和番茄（Lycopersicum esculentum L.）等作物上生存的昆虫之间的杂交亲和性和繁殖力。来自不同作物的昆虫与从Bt棉花上采集的昆虫以及它们彼此之间都能自由杂交。不同杂交组合的平均繁殖力在正交时为每雌314.1至426.3粒卵，反交时为每雌305.8至421.7粒卵。在任何给定的杂交中，记录到的最低卵孵化率为85.89%。此外，发现不同杂交组合的F1个体能与它们的亲本（BC1）自由杂交，并且它们彼此之间杂交时具有相似的繁殖力和卵孵化率。在不同寄主植物上的棉铃虫之间具有高杂交亲和性，这表明在印度等国家可能存在的作物镶嵌模式可以作为天然的、非结构化的避难所发挥重要作用，并延长用于控制这种昆虫的基因的持久性。
