In order to investigate the ultrastructural changes of tomato cells under chill stress,the changes of cell ultrastructure under different temperatures of 6 ℃. 10 ℃ and 25 ℃ for ten days were studied using tomato chill-sensitive cultivar 010 as the materials. The results showed that under 25 °C the chloroplast structure was compact and orderly,the body of thylakoid revealed arrangement of the rules of neat and the cells in ultrastructure did not accumulated a particle osmium tetroxide. The structure of chloroplast was partly destroyed under chill stress of 6 ℃10 ℃. The membrane of chloroplast partly disjointed, its structure arrayed disorderly and twisted, and there were numerous large starch grains and osm iophilic granules in the cell. Low temperature adversity led to the damage of cellular structure of cell membrane system of tomato.%为研究低温下番茄细胞超微结构的变化,以耐寒性较弱的番茄品种010为试材,观察其幼苗经6、10、25℃处理后10 d细胞超微结构的变化.结果表明:25℃处理下,叶绿体结构致密有序,体内类囊体片层有规则的整齐排列,细胞的超微结构中无嗜锇颗粒的积累；6、10℃低温处理下,叶绿体超微结构损伤,叶绿体部分膜解体破裂,类囊体片层结构排列紊乱,变形或扭曲,细胞内有较大的淀粉粒和大量嗜锇颗粒的积累.低温逆境导致番茄细胞膜系统和细胞结构受到破坏.
展开▼
