Table 1 Relationship between floral morphological characteristics and female meiotic stage of P. pseudo-simonii × P. nigra ‘Zheyin3#’
From: Induction of unreduced megaspores with high temperature during megasporogenesis in Populus
Days of culture | Female floral stage | Floral morphological characteristics | Representative female meiotic stages |
|---|---|---|---|
9.5 | I | Bud is tightly wrapped by bract scales | MMC-early leptotene |
10.5 | II | Slight bulginess in the mid bud region | MMC-late leptotene |
13 | III | Bract scales dehisced slightly, catkin not emerged | Leptotene-diakinesis |
13.5 | IV | Bract scales dehisced and catkin slightly emerged | Pachytene-prophase II |
15 | V | One third of the catkin outside of bract scales | Diakinesis-telophase II |
15.5 | VI | Half of the catkin outside of bract scales | Prophase II-tetrad |
16.5 | VII | Two third of the catkin outside of bract scales | Metaphase II-uninucleate embryo sac |