旱稻(Oryza sativa)/稗草(Echinochloa caudata)//高梁(Sorghum bicolor)三属杂种表现及分析

以旱稻基因型远F2 1 [旱 65 (Oryzasativa) 长芒稗 (Echinochloacaudata) ]为母本 ,高粱(Sorghumbicolor)基因型沈农 1 33为父本 ,进行属间远缘杂交 ,获得三属间杂交实粒种子。对杂交种F0 、F1、F2 代连续观察结果表明 :( 1 )杂交F0 代高度不孕 ,并伴有杂交种发育夭折现象发生 ,结实率仅为 2 63‰ ;( 2 )F1杂种优势明显 ,株高、穗长、1级枝梗数、小花数、结实粒数、结实率、千粒重诸性状超母本优势为 0 61 %～ 2 0 5 6% ;主茎叶片数多于母本 1片 ,总叶面积超亲优势为 1 1 95 % ;F1出现母本没有的红芒、红护颖和紫柱头 3个可遗传性状 ;( 3)F2 除在生育期、株高及穗长等性状发生分离外 ,其典型特征是穗型、芒性、芒色、柱头颜色、护颖颜色等性状发生分离

PROGENY PERFORMANCES OF A THREE GENERIC HYBRIDIZATION OF UPLAND RICE(Oryza sativa)/BARNYARD GRASS(Echinochloa caudata)//SORGHUM(Sorghum bicolor)

A three generic hybridization was made from upland rice genotype Yuan F2 1 derived from a wild hybridization of upland rice Han 65 (Oryza sativa) /Long awn barnyard grass (Echinochloa caudata) , with a sorghum genotype of Shennong 133 (Sorghum bicolor) . Successive studies of its F-0, F-1 and F-2 showed that: (1)F-0 was highly cross|incompatible and accompanied with seed abortion with seed set rate of 2^63%; (2)F-1 had excellent fertility with good heterosis. The characteristics such as plant height, head length, first branches, florets, seeds/head, seed set rate, 1000|grain weight and leaf area of main stem in F-1 were 0^61%～20^56% over its female; and leaf number was 1 piece more than its female. Additionally, it also showed red awn, red glume and purple stigma, which was different from its female's white color; (3) characters segregating did happen in F-2, besides agronomic traits such as plant height, ear length, etc, the typical segregating were from head type, awn length, awn color, stigma color and glume color.