INRA, UMR 1210, Biologie et Gestion des Adventices, Institut National de la Recherche Agronomique, 17 rue Sully, Dijon BP 86510, 21065, France; National Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Science, 20 Nanxincun, Beijing 100093, PR China.
Plant Sci. 2010 Nov;179(5):459-65. doi: 10.1016/j.plantsci.2010.07.005. Epub 2010 Jul 15.
Introgression between genetically modified (GM) crops and wild relatives is considered to potentially modify the genetic background of the wild species. The emergence of volunteer-like feral populations through backcross of hybrids to the crop is also a concern. The progeny of spontaneous hybrids between mutant herbicide-resistant oilseed rape (Brassica napus) and wild B. juncea was obtained. Parents, F(2) and BC(1) to B. napus were planted together in the field so as to study their performance. The chromosome number of BC(1) followed a Normal distribution. Mendelian ratio of the herbicide-resistance gene was found. The F(2) produced less seeds than B. napus, and BC(1) had intermediate production. Herbicide-resistant BC(1) were not different of their susceptible counterparts for plant weight, seed weight and seed number, but most of them exhibited B. napus morphology and larger flowers than the susceptible BC(1). They displayed an important genetic variability allowing further adaptation and propagation of the herbicide-resistance gene. Pollen flow to susceptible plants within the mixed stand was observed. As a consequence, the resistant BC(1) produced with B. napus pollen could frequently occur and easily establish as a false feral crop population within fields and along roadsides.
基因修饰（GM）作物与野生亲缘种之间的基因渐渗被认为可能改变野生种的遗传背景。杂种与作物回交产生的类似野生的自由生长种群也是一个关注点。本研究获得了突变型抗除草剂油菜（Brassica napus）与野生 B. juncea 自然杂交产生的自发杂种后代。将亲本、F2 代和回交第一代（BC1）与油菜一起种植在田间，以研究它们的表现。BC1 的染色体数目呈正态分布，发现了除草剂抗性基因的孟德尔分离比。F2 代产生的种子比油菜少，而 BC1 则处于中间水平。与敏感对照相比，抗除草剂的 BC1 在植株重量、种子重量和种子数量方面没有差异，但它们中的大多数表现出油菜的形态和比敏感对照更大的花朵。它们表现出重要的遗传变异性，允许进一步适应和传播除草剂抗性基因。在混合种植的情况下，观察到了向敏感植物的花粉流动。因此，用油菜花粉产生的抗除草剂 BC1 可能会经常出现，并容易在田间和路边作为虚假野生作物种群建立。
