【摘要】 从桂朝 2号辐射突变系辐 5 4针叶中选出 5 4 5窄叶株 ,其株高 (6 9.8±5 .0 )cm ,剑叶长 (18.8± 1.6 )cm ,剑叶宽 (0 .87±0 .0 7)cm ,千粒重 (13.7± 0 .2 3)g,谷粒为麻壳 ,株叶型好 ,不早衰。经过 5年的连续跟踪选择和初步的遗传测定 ,该窄叶材料始终处于分离状态 ,且分离呈规律性变化 ,即凡是窄叶株 ,下代就一定分离出宽叶株和窄叶株两种类型 ,分离比单株间存在差异 ;从窄叶株分离出来的宽叶株 ,下代仅出现一种类型 ,即宽叶株 ,群体间变异小。 5 4 5窄叶与具有标记性状的稳定宽叶材料杂交 ,各组合F1 代都表现为宽叶 ;F2 代群体中没有窄叶株出现 ,表现为一极分离状态。 5 4 5宽叶与标记性状的稳定宽叶材料杂交 ,各组合F1 代都表现为宽叶 ;F2 代群体中既有双亲叶型 ,也有中间叶型。更多还原

【Abstract】 The 545-angustifoliate material(545AL), origin at ed from a radiation mutation of Fu 54-needle material, was used to study the ge netics of leaf width. The characters of 545AL were 69.8±5.0 cm in plant height, 18.8±1.6 cm and 0 87±0.07 cm in flag leaf length and width, and 13.7±0. 23 g in 1000-grain weight. 545AL always segregates,namely every angustifoliat e plant always segregates two type plants (the wide-leaf plants and the angusti foliate plants) with different segregation ratios. The wide-leaf plants derived from the angustifoliate plants would produce only wide-leaf plants in next gen eration with small variation of plant population. Crosses between 545AL and wide -leaf materials expressed wide leaf in F 1, F 2,without angustifol iate plants in F 2. Crosses between the 545-wide leaf material and wid e-leaf materials showed wide-leaf in F 1, and classic segregation in F 2. It suggested that the 545AL might be a new type of rice germplasm.更多还原