'Yitongtianxia' is a new tetraploid asparagus bean (Vigna unguiculata ssp. sesquipedalis) selectively bred by genealogy method from the lines of 'Mimeixiaoye(2X)' with chemical mutagenesis of colchicine.The plants are trailing with strong growth vigor.Its average plant height is 306.5 cm.The internode length is 20.2 cm.It is of early maturity.The first flower sets on the 3rd node.Its growth period is about 93 days.It takes 58 days from seedling emergence to first harvest.It has strong and successive podding ability. The production ratio of double-pod and four-pod is high.The commercial pod is green white in color with shining smooth surface and beak red color.It has no rat tail and plump seed.The pod is 89.3 cm in length,about 0.9 cm in width.Its average single fruit weight is 27.4 g.There are about 20 pods per plant.It can yield about 33 t?hm-2. Its resistances to virus disease,powdery mildew and rust disease in field are stronger than that of the contrast 'Zaojiang No.4'.And its comprehensive characteristics are super.It is suitable for cultivation in Jiangsu, Zhejiang,Anhui and Henan,etc. provinces.%采用系谱法对秋水仙素化学诱变的米美小叶进行选育,获得四倍体长豇豆一桶天下.植株蔓生,生长势强,平均株高306.5 cm,节间长度20.2 cm.早熟,始花节位位于第3节,生育期93 d(天)左右,出苗至始收58 d(天)左右.连续结荚能力强,双荚四荚率高,商品荚绿白色,荚面光滑有光泽,缝线不显,喙红色,无鼠尾,不鼓籽,荚长89.3 cm左右,荚粗0.9 cm左右,平均单荚质量27.4 g,单株结荚20根左右,每667 m2产量2200 kg左右.田间对病毒病、白粉病和锈病的抗性强于对照早豇4号,综合性状表现优良,适宜在江苏、浙江、安徽、河南等地栽培.
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