求翻译：摘要：本文主要阐述自发现冠菌素以来冠菌素在各方面的应用和进展。内容包括冠菌素的结构、性质和生理作用，简述冠菌素合成研究的几个阶段，介绍近年来冠菌素的生物合成和化学合成方法，说明冠菌素和植物内源激素之间的相互关系、冠菌素在提高植物抗逆性方面的作用和应用前景。指出目前冠菌素的生物合成仍然存在产量低，发酵条件苛刻等不足以及今后生物合成冠菌素研究的热点。是什么意思？

Abstract: This paper describes the self-discovery since the crown crown streptozotocin streptozotocin in all aspects of the application and progress. Streptozotocin including crown structures, properties and physiological effects, brief synthesis of the highest stages of streptozotocin, introduced i

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Abstract: This article main elaboration since discovery crown rhzomorph crown rhzomorph in various aspects application and progress.The content including the crown rhzomorph structure, the nature and the physiological action, summarizes crown rhzomorph synthesis research several stages, introduced t

Abstract: this paper mainly on coronatine since found bacteria in order and progress in all aspects of the application. Includes structures, properties and physiological effect of coronatine, brief coronatine study on the synthesis of several stages, introduced in recent years coronatine biosynthesi