摘要
以辣椒核型雄性不育两用系 AB154和 AB 兖1691为试材,对不育株和可育株小孢子的不同发育时期进行了细胞学比较分析。结果表明:不育株小孢子败育发生在四分体小孢子形成以前,靠近小孢子的一层绒毡层细胞在小孢子母细胞期已解体,其余绒毡层细胞在花粉粒成熟期仍然结构完整;可育株绒毡层在单核花粉粒期开始解体,花粉粒成熟期时完全解体。不育株花药药隔维管束发育滞后于可育株,退化却早于可育株。部份绒毡层提前解体和药隔维管束发育异常使小孢子正常发育所需要的营养物质供应受阻,可能是造成小孢子败育的重要原因。
Comparison and cytological characteristics analysis were conducted during the stages of microsporogenesis between sterile plants and fertile plants of nuclear male sterility (NMS)two-line systems of pepper(Capsicum annuum L.),AB154 and AB1691.The results showed that abortion of microspore occured before tetrads formed.Tapetal cells of sterile an- thers near microsporocytes decomposed,other tapetal cells persisted until the stage of mature pollen.In contrast,tapetal cells of fertile anthers began to degenerate at the stage of mononuclear pollen.Vascular bundle of sterile anthers developed more slowly and degener- ated more early than that of fertile anthers.Premature degene ration of parts of tapetum and abnormalities of vascular bundle may reduce nutrient supplies to developing microspores, and this may be one of the reasons for sterility of nuclear male sterility of pepper.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1999年第C00期26-29,共4页
Journal of China Agricultural University
