Periodicity of cambial activity and variability of peroxidase and esterase isozymes in Eucommia ulmoides Oliv

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	Periodicity of cambial activity and variability of peroxidase and esterase isozymes in Eucommia ulmoides Oliv
	Luo, Lixin ; Cui, Keming ; Li, Zhengli ; Li, Juhuai
刊名	北京大学学报自然科学版
	1999
英文摘要	The cambium of Eucommia ulmoides Oliv resumed its activities in mid-March. It ceased to produce new phloem cells at the end of July, but continued to differentiate into xylem cells until mid-August, at which time the cambium became dormant albeit subsequent differentiation of newly formed in nature phloem and xylem cells into mature ones continued until December. In consistent with the periodicity of cambial activity, the variability of peroxidase isozyme activity as demonstrated by isozymography was most significant in the cambial region. PO I and PO II presented only in the spring when cambium activity was resumed. The activity of PO III was weakened in summer and increased gradually reaching to the highest level in winter. The variability of esterase isozyme activity in the vascular tissues was in consistent with the periodicity of cambial activity. Isozyme activity EST III - V near the negative pole of the zymograph disappeared in specimens collected during growth season and its activity was revived when cambium became dormant. Isozymes of EST II being the most active and present over time, might play an important role in development and differentiation of vascular tissues.; EI; 0; 2; 209-216; 35
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/408560]
专题	生命科学学院
推荐引用方式 GB/T 7714	Luo, Lixin,Cui, Keming,Li, Zhengli,et al. Periodicity of cambial activity and variability of peroxidase and esterase isozymes in Eucommia ulmoides Oliv[J]. 北京大学学报自然科学版,1999.
APA	Luo, Lixin,Cui, Keming,Li, Zhengli,&Li, Juhuai.(1999).Periodicity of cambial activity and variability of peroxidase and esterase isozymes in Eucommia ulmoides Oliv.北京大学学报自然科学版.
MLA	Luo, Lixin,et al."Periodicity of cambial activity and variability of peroxidase and esterase isozymes in Eucommia ulmoides Oliv".北京大学学报自然科学版 (1999).