Abstract : this paper deals with the advance of micropropagation and elimination of the pathogen of witch - broom disease ( mycoplasma like organisms : mlo ) in chinese jujube ; and according to the latest achievements in this field , summarises the experence achieved and the factors which have been discovered to affect in vitro culture in the species . the main problems needed to be further studied were outlined 文摘:综述了枣树离体培养快速繁殖现状及脱除枣疯病原mlo的研究进展，并根据国内外最新研究成果，对已取得的经验和影响枣树离体培养的因素作了总结，指出了当前工作中存在的主要问题。
Dissecting the prothoracic glands , by using silkworms " prothoracic glands in vitro culture and h - ecdysteroid - radioimmunoassay , the biological activities of those analog peptides were examined , and their active features , chemical parameters , as well as the relationship between structures and functions of those peptides were analyzed and compared . with an exception of 899808 having the sequence of awqdlsaw that affected like bom - ptsp , 899805 ( awqdlns ) and 899809 ( awqdlnsgaw ) partially stimulated ecdysteroidogenesis in a dose dependent manner , whereas 899803 ( dlnsaw ) , 899804 ( awqdlnsa ) , 899806 ( awqdln ) as well as 899807 ( awqdlnsawa ) had both stimulatory and inhibitory effects on ecdysteroidogenesis , depending on the concentrations 研究结果表明，类似多肽89980吕（ awq uawaw ）的生物学功能与抑前胸腺肽的相同而且活性近似：类似多肽899805 （ awqdlns ） 899809 （ awqdlns … ）对家蚕前胸腺蜕皮激素的生物合成表现出随浓度增加而增加的促进作用，而低浓度下几乎不促进； 899803 （ dlnsawawl899804 （ awqdmsa ） 、 899806 （ awqdln ）和899807 （ awqdlnsawa ）类似多肽对家蚕前胸腺蜕皮激素的生物合成的促进和抑制作用与它们的浓度有着依赖关系。
