摘要： 用聚乙二醇(Polyethylene glycol，PEG6000)处理新疆野苹果(Malus sieversii(Ledeb)Roem.)幼苗。通过对其叶片及根系中各细胞器的超微结构分析发现，干旱胁迫能诱导新疆野苹果发生细胞程序性死亡，并具有以下特点：随着干旱处理时间的延长，根系中各细胞器形态结构发生变化的时间普遍早于叶片；同是叶片，海绵组织中各细胞器形态结构发生变化的时间早于栅栏组织；同是根系，皮层细胞中各细胞器形态结构变化的时间普遍早于中柱细胞。

关键词: 干旱胁迫, 新疆野苹果, 细胞程序性死亡, 细胞形态学, 诱导

Abstract: Seedlings of Malus sieversii treated with polyethylene glycol (PEG6000) were used to study the characteristics of Malus species under drought stress. Programmed cell death occured in sieversii under drought stress, which can be observed through cellular ultrastructure of leaves and roots and had the following features: under drought stress, the changes of organelle morphosis in roots were ealier than those in leaves. In leaves the changes of organelle morphosis in spongy mesophylls were earlier than those in palisade parenchymas. In roots the changes of organelle morphosis in cortical cells were earlier than those in pericycle cells. Results showed that an alternative method to indentify programmed cell death in Malus plants was to observe the cellular ultrastructure.

Key words: Drought stress, Malus sieversii, Programmed cell death, Cytomorphological, Induce

中图分类号: 

• S661.01