Fig. 1: Meiosis and mitosis period of P. alba ‘Berolinensis’.

A The chromosome composition of P. alba ‘Berolinensis’ by FISH. Blue bars represent chromosomes. The green dots represent the telomere probe at 494 nm. B Ploidy analysis of the triploid poplar by FCM. C Meiosis period of P. alba ‘Berolinensis’, including microsporocyte; leptotene; pachytene; metaphase I; anaphase I; prophase II; metaphase II; anaphase II; telophase II (tetrad). D Mitosis period of the microspore cell in the triploid poplar. Mid-single nucleus represents the period of middle single nucleus; Mar single nucleus represents the period of Marginal single nucleus; Germination represents the period of pollen tube germination.