8个白菜型冬油菜品种抗寒性的初步评价

Primary evaluation of cold tolerance among eight winter Brassica rapa

以8个抗寒性不同的白菜型冬油菜为试验材料,研究了冬油菜品种的抗寒性与越冬率、植物学特征、生长发育特性、干物质积累特性等指标的关系.结果表明:参试品种可划分为4种类型,即超强抗寒性品种、强抗寒品种、抗寒性品种和一般抗寒品种.抗寒性强的品种MXW-1,DQW-1冬前生长发育较缓慢,匍匐生长,叶色浓绿,叶脉微紫,越冬期叶片数偏少,平均为8～9片,较早进入枯叶期.根系发达,根冠比大.返青晚,成熟期晚,生育期较长.

In this study,eight winter Brassica rapa cultivars were selected as materials,studied the relation between cold tolerance and botanic characteris-tics,growing period and dry matter accumulation.The results indicated:the eight winter rapeseed were divided into four groups:ultra winter-hardy cultivars,strong cold tolerance cultivars,cold tolerance cultivars and ordinary cold tolerance cultivars.The ultra winter-hardy cultivars(MXW-1,DQW-1) grew horizontally and their leaves were dark green or purple,their gro...