Smart Catherine M
Cell Biology Department, Institute of Grassland and Environment Research, Plas Gogerddan, Aberystwyth, Dyfed, SY23 3EB, Wales, UK.
New Phytol. 1994 Mar;126(3):419-448. doi: 10.1111/j.1469-8137.1994.tb04243.x.
Leaf senescence is a hiphly-controlled sequence of events comprising the final stage of development. Cells remain viable during the process and new gene expression is required. There is some similarity between senescence in plants and programmed cell death in animals. In this review, different classes of senescence-related genes are defined and progress towards isolating such genes is reported. A range of internal and external factors which appear to cause leaf senescence is considered and various models for the mechanism of senescence- initiation are described. The current understanding of senescence at the wrganelle and molecular levels is presented. Finally, same ideas are mooted as to why senescence occurs and why it should be studied further. Contents Summary 419 I. Introduction 420 II. Internal factors that cause senescence 423 III. External factors that cause senescence 427 IV. What is the mechanism of senescence initiation? 428 V. Progress in the understanding of organelle senescence 431 VI. Progress in the understanding of senescence at the molecular level 434 VII. The control of senescence in animals and plants 440 VIII. Why is senescence necessary? 441 IX. Why study senescence? 441 References 442.
叶片衰老过程是一系列高度受控的事件，构成了发育的最后阶段。在此过程中细胞保持存活，并且需要新的基因表达。植物衰老与动物程序性细胞死亡之间存在一些相似之处。在本综述中，定义了不同类别的衰老相关基因，并报告了分离此类基因的进展。考虑了一系列似乎导致叶片衰老的内部和外部因素，并描述了衰老起始机制的各种模型。介绍了目前在细胞器和分子水平上对衰老的理解。最后，对衰老为何发生以及为何应进一步研究提出了一些想法。内容摘要419 一、引言420 二、导致衰老的内部因素423 三、导致衰老的外部因素427 四、衰老起始的机制是什么？428 五、细胞器衰老理解方面的进展431 六、分子水平上衰老理解方面的进展434 七、动植物衰老的控制440 八、衰老为何必要？441 九、为何研究衰老？441 参考文献442 。
