Chloroplast division during leaf development of xanthium pensylvanicum wallr. (compositae)

摘要

Division and growth of chloroplasts was studied during leaf development of Xanthium pensylvanicum at various stages of development represented by the leaf plastochron index. Between leaf plastochron indices -1.00 and 2.56 chloroplast division was observed with little enlargement. Between 2.50 And 5.00 chloroplasts enlarged in diameter with an average rate of 0.21 μm per day .At leaf af plastochron index 5.00 chloro- Plasts attained their mature size of 6.12 um.