两系粳杂70优双九的选育

Breeding of the Two-line Japonica Hybrid Rice 70 You Shuangjiu

７０优双九是安徽省农科院水稻所以本所选育的７００１Ｓ为母本与优质父本双九配组育成的两系杂交晚粳新组合。它具有优质、高产、多抗、灌浆较快和较易脱粒等突出优点。１９９５年被评为安徽省优质米，１９９７年８月通过安徽省品种审定。

You Shuangjiu (7001S/Shuangjiu, in which Shuangjiu is a japonica variety with good grain quality), newly-developed by the Rice Research Institute of Anhui Academy of Agricultural Sciences, was a late two-line japonica hybrid rice. It has the characteristics of good grain quality (brown, milled and head rice were 83.1%, 75.3% and 74.0%, respectively, length/ width ratio 1.9, chalky rice 7%; gelatinization temperature low at scale 6.9, gel consistency soft at 80 mm, amylose and protein contents 18% and 9.3%, respectively), high and stable yielding ability (in Anhui Double-cropping Late Japonica Rice Variety Regional Trials in 1995 and 1996, it yielded a mean of 6.91 t/hm 2, 9.39% higher than that of the check Eyi 105), multiresistance (intermediate resistance to rice blast and bacterial leaf blight, both scored at the third on the 1～9 scales), fast ripening and easy threshing. It was evaluated as a fine grain quality rice of Anhui Province in 1995 and released to farmers in August, 1997.