CHANGES IN CHLOROPLAST FINE STRUCTURE DURING AUTUMNAL SENESCENCE OF BETULA LEAVES
CHANGES IN CHLOROPLAST FINE STRUCTURE DURING AUTUMNAL SENESCENCE OF BETULA LEAVES
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DOI：
10.1093/oxfordjournals.aob.a084412
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发表时间：
1970-01-01
期刊：
影响因子：
4.2
通讯作者：
DODGE, JD
中科院分区：
文献类型：
--
作者：
DODGE, JD
在桦树叶片衰老和衰老过程中，从完全展开的绿色状态到黄色末端状态，叶绿体的形状发生变化，其体积减少到不到五分之一。与这些变化相关的是叶绿体片层的数量和基粒大小的最初增加，但随之而来的是膜系统的崩溃。叶绿体脂滴的大小明显增大，但数量增加不明显。详细描述了叶绿体膜的结构。在叶绿体破裂过程中，在类囊体膜的内表面可见约8×5 nm的小颗粒。叶绿体是第一个显示衰老迹象的细胞器，也是其他细胞器全部分解后最后保留下来的细胞器。讨论了这些观察与草本植物叶绿体的衰老和果实的有色体发育的关系。
During the ageing and senescence of leaves of the birch tree,Betula verrucosaEhrb., from the fully expanded green state to the yellow terminal condition, the shape of the chloroplasts alters and their volume decreases to less than one-fifth. Associated with these changes is an initial increase in the number of chloroplast lamellae and size of the grana but this is followed by the breakdown of the membrane systems. The chloroplast lipid globules increase considerably in size but show little increase in number. The structure of the chloroplast membranes is described in detail. Small particles approximately 8 × 5 nm, become visible on the inner surfaces of the thylakoid membranes during chloroplast breakdown. The chloroplasts are the first organelles to show signs of senescence and are the last to remain after the other organelles have all broken down. The observations are discussed in relation to the senescence of chloroplasts of herbaceous plants and the development of chromoplasts of fruits.