Abstract: Meiosis of pollen mother cells(PMCs) of three interspecific hybrids of Gossypium,TM-1 (Texas Marker 1,G. hirsutum) ×Shixiya 1 (G. arboreum), TM-1 ×G. armourianum,TM-1 ×G. thurberi, were observed. The Chromosome configuration of most of PMCs at metaphase Ⅰin these hybrids was 13 Ⅱ+ 13 Ⅰ. Bivalents synapsized into ring, rod, or V-shape.The synapsis of bivalents in the hybrid TM-1 ×G. armourianum was better than the other two hybrids. Hybrids produced anomalous synapsis of AD chromosomes and multivalents as well as normal synapsis of AA and DD chromosomes. Most of univalents scattered on the two sides of the equatorial plate and moved earlier to poles. One or two bivalents were not on the equatorial plate. The chromosome bridges were frequently formed when bivalents moved towards the poles,which slowed down the moving speed of chromosomes and resulted in nonsynchronization of cell divisions. In addition, lagging chromosomes, scattered chromosomes far from most of chromosomes, and lone small chromosome groups were found during the first and second divisions. PMCs yielded more nucleoli at telophase Ⅱ. At tetraspore stage, these three hybrids produced not only tetrads but also polyads (2-10 microspores). Tetrad percentages were 70. 2,63.1, and 35. 1 respectively in TM-1 ×Shixiya 1, TM-1 ×G. armourianum, and. TM-1 ×G.thurberi.

Key words: Meiosis, Interspecific hybrid, Pollen mother cell, Gossypium spp

CLC Number: 

• S562.01