Pandey S, Ranade S A, Nagar P K, Kumar N
Plant Biotechnology Division, Institute of Himalayan Bioresource Technology, Palampur 176 061, India.
J Biosci. 2000 Sep;25(3):291-9. doi: 10.1007/BF02703938.
Under optimal conditions of growth, senescence, a terminal phase of development, sets in after a certain physiological age. It is a dynamic and closely regulated developmental process which involves an array of changes at both physiological and biochemical levels including gene expression. A large number of biotic and abiotic factors accelerate the process. Convincing evidence suggests the involvement of polyamines (PAs) and ethylene in this process. Although the biosynthetic pathways of both PAs and ethylene are interrelated, S-adenosylmethionine (SAM) being a common precursor, their physiological functions are distinct and at times antagonistic, particularly during leaf and flower senescence and also during fruit ripening. This provides an effective means for regulation of their biosynthesis and also to understand the mechanism by which the balance between the two can be established for manipulating the senescence process. The present article deals with current advances in the knowledge of the interrelationship between ethylene and PAs during senescence which may open up new vistas of investigation for the future.
在最佳生长条件下，衰老作为发育的终末期，在达到一定生理年龄后开始。衰老是一个动态且受到严格调控的发育过程，涉及生理和生化水平的一系列变化，包括基因表达。大量生物和非生物因素会加速这一过程。有确凿证据表明多胺（PAs）和乙烯参与了这个过程。尽管PAs和乙烯的生物合成途径相互关联，S-腺苷甲硫氨酸（SAM）是它们的共同前体，但它们的生理功能不同，有时甚至相互拮抗，特别是在叶片和花朵衰老以及果实成熟过程中。这为调控它们的生物合成提供了一种有效手段，也有助于理解如何建立两者之间的平衡以调控衰老过程的机制。本文论述了衰老过程中乙烯与PAs相互关系的当前知识进展，这可能为未来开辟新的研究视野。
