导入野生稻增产QTL育成优质高产杂交稻新组合Y两优7号

Breeding of New Hybrid Rice Combination Y Liangyou 7 with High Yield and Good Quality by Introducing Yield-increase QTLs of Wild Rice

国家杂交水稻工程技术研究中心以超级稻亲本9311为受体和轮回亲本,与马来西亚普通野生稻杂交和连续回交,利用分子标记辅助选择,育成了携带野生稻增产QTLyld1.1和yld2.1的新亲本R163,与自选广适性光温敏不育系Y58S配组,育成两系杂交中稻新组合Y两优7号。该组合株叶形态优良,丰产性好,米质优良,抗逆性强,适应性广,2008年3月通过湖南省农作物品种审定,同年被湖南省认定为超级稻品种。报道了Y两优7号的选育过程、特征特性及其高产栽培与制种技术要点。

Y Liangyou 7 or Y58S/R163, is a new two-line medium hybrid rice combination developed by China National Hybrid Rice Research and Development Center （CNHRRDC）. R163 is a new CNHRRDC-developed parental line carrying both yldl. 1 and yld2.1 QTLs from a Malaysian common wild rice by crossing 9311, a parent of su- per hybrid rice, as the receptor and recurrent parent, with the Malaysian common wild rice, the donor of the yieldincrease QTLs, and selecting single plants with yield-increase QTLs with the aid of molecular markers to make baekcrosses successively. Y58S is a CNHRRDC-developed PTGMS line with a wide adaptability. Y Liangyou 7 is characteristic of good plant type, high-yielding capacity, fine grain quality, strong stress resistance and wide adaptability. In March, 2008, it was registered and released to commercial production by Hunan Provincial Crop Variety Appraisal Committee, and in the same year it was ranked as a super rice variety in Hunan Province. The breeding procedure, characteristics and major applied techniques in high-yielding cultivation and hybrid seed production of Y Liangyou 7 were introduced in this paper.