(k) (m) (n) (p) Figure 6 PMC meiosis II and early uninucleate microspore of hybrid(1000x).(a)Metaphase II with chromosome straggling(arrow)and abnormal cytokinesis:(b)metaphase II with chromosomes concentrated in one of the sister cells:(c)anaphase II with laggards (arrow):(d)telophase II with abnor- mal meiosis:(e)telophase II with chromosomes concentrated in one of the sister cells:(f)telophase II with spindle orientation in multi-directions:(g) telophase II with abnormal spindle orientation:(h)telophase II with micronuclei (arrow):(i)a tetrad with abnormal nuclei:(i)a tetrad with abnormal nuclei and micronuclei (arrow):(k)a tetrad with abnormal nuclei and sister cells in disorder arrangement:(1)a triad formed at tetrad stage:(m)a triad with a binucleate microspore (arrow):(n)a triad with restitutional nucleus in one microspore (arrow):(o)pentad:(p)an early uninucleate microspore with abnormal nucleus.Biology of plant reproduction 20