Abstract: Three interspecific crosses involving two accessions of Oryza officinalis with brown planthopper(BPH) resistance and two improved susceptible lines of O. sativa were attempted, and F₁, F₂ and BC₁F₁ hybrids were prepuced through embryo culture. The F₁ hybrids shared traits from O. officinalis such as purple stigma, long awn and BPH resistance, and were male sterile due to the low amount of chromosome pairing(0.77 bivalents) or failure of anther formation;nevertheless, one F₂ plant with 2n =46 was unexpectedly obtained. BC₁F₁ plants resulted from backcrossing to O.sativa were allotriploid (AAC) with a chromosome configuration of 12.25 Ⅰ+11.85 Ⅱ+0.01Ⅲ at metakinesis Ⅰ(MI).

Key words: brown planthopper resistance, chromosome pairing, interspecific hybrid, Oryza officinalis, Oryza sativa

摘要： 选用两个抗褐飞虱的药用野生稻编号材料与两个感虫栽培品种杂交，通过胚培养获得了F₁、BC₁F₁和F₂植株。F₁杂种表现出野生亲本紫色柱头、长芒及抗褐飞虱等特性，其花粉母细胞中期I染色体多为单价体(仅0.77个二价体)，甚至不能形成花药，因而表现雄性不育，仅获得一株F₂，染色体数目为2n=46。用栽培稻回交获得BC₁F₁植株为异源三倍体，中期I染色体构型为12.25Ⅰ+11.85Ⅱ+0.01Ⅲ。

关键词: 栽培稻, 药用野生稻, 种间杂种, 抗褐飞虱特性