摘要： 采用改进的焦锑酸钙沉淀的细胞化学方法，探讨了在干旱逆境条件下细胞核与Ca²⁺水平变化的关系。结果表明：在正常水分下生长的小麦幼苗，其细胞核中含有少量Ca²⁺；细胞核圆球状，异染色质分散分布于常染色质之间。随着水分胁迫时间的延长，细 胞核中的自由Ca²⁺逐渐增多，同时细胞核超微结构受到的伤害越发严重，核膜皱缩 ，异染色质凝聚加重，直至细胞核面临解体。

关键词: 小麦, 细胞核, 钙, 干旱逆境

Abstract: The relationship between the nucleus of the wheat seedli ng and Ca²⁺ under water stress was examined with the cytochemical method of the improved calciu m antimonate precipitation. The results obtained showed that there was a little calcium in nucleus; the shape of the nucleus liked a ball and the chromatin was scattered distributed. With the longer the duration of water stress the higher the free Ca²⁺ in nucleus and the more serious the ultrastructure of the nu cleus; the membrane of the nucleus wrinkled and the chromatin agglutinated, the shape was abnormal, at last it was disintegrated.

Key words: Wheat, Nucleus, Ca2+, Water stress