ABA诱导离体红松针叶衰老过程中叶肉细胞超微结构的变化

ABA处理离体针叶,使RNase活性明显提高,针叶变黄加剧以及叶肉细胞超微结构有序衰老,证明ABA可以加速江松针叶的衰老。作者以红松(Pinus koraiea sis sieb et Zucc)针叶叶肉细胞各细胞器对衰老的敏感程度为序,将针叶衰老过程划分衰老早期、衰老中期及衰老后期。

THE CHANGE OF ULTRASTRUCTURE OF MESOPHYLLICELLS DURING THE PROCESS OF SENESCENCE OF EXCISEO NEEDLES OF PINUS KORAIENSIS INDUCED WITH ABA

The paper reported that ABA can accelerate the senescence of excised needles of Pinus Koraiensis, on basis of the evidences that RNase activities were increased distinctly, the yellowing of needles intensified and the ultrastructures of mesophyll cells senesced sequentially by treatment of excised needles with ABA. According to the order of the degree of sensibility to senescence of different organelles in mesophyll cells of needles of Pinus Koreiensis, we divide the process of senescence into three periods:the early stage of senescence, the middae stage of senescence and the late stage of senescence and sum up as follows:Start of senescence#br# Chloroplasts (envelope membrans degraded, lamellas partly swolled) Endoplasmics (vesicle appeared) False plasmolysis (appered)#br# Chloroplasts (envelope membranes damaged, a large of lamellas spoiled) Mitochoadrias (envelop membranes swolled, No, of cristaer.decreased) Endoplasmics (hyperplasia temporally) Golgi osomes (s wo lied) Primary lysosomes (formed) Nuclear pores (closed)#br# Chloroplasts (disintegrated completely) Mitochondrias Endoplasmics Golgiosomes (disintegrated) Membranes of {vacuoles lysosomes drotoplasms (disintegrated)#br# Cells died.