HARN, Chang Yawl & Byung Ki LEE (Chunpuk National Univ.) Studies on the microgametophyte of Zebrina pendula. Kor. Jour. Bot. V(2): 1-5. 1962.
Attempts were made in order to make clear the meiotic irregularities, male gametophyte formation and spermatogenesis for the purpose of applying these embryological facts to taxonomic works. Followings are the results obtained:
1. Meiosis is extremely irregular, giving rise to giant, micro, and empty pollens. Meiotic division in each PMC is observed synchronizing.
2. In the microspore immediately before the vegetative-generative nuclear division, the nucleus locates appressed to the inner wall, most of the other part of the cell being occupied by large vacuoles.
3. Spindle symmetry in the microspore nuclear division is of intermediate type.
4. Nuclear divisions in each microspore are not synchronized as in meiosis.
5. Generative nucleus is located in close contact with the inner wall, while the vegetative nucleus occupies the central part of pollen grain. The pollen in this stage looks somewhat like broad bean. Afterward the generative nucleus loses contact with the wall, the nuclear shape changing from lenticular to roundsh.
6. The generative nucleus in fully matured pollen grain usually takes the shape of crescence, those in abortive pollen, lenticular or ellipsoidal, etc.
|